CN107024561A - The evaluating apparatus and evaluation method of a kind of simulated solar optical drive catalysis material water treatmenting performance - Google Patents

Abstract

The invention provides an evaluation device and an evaluation method for simulating the sunlight-driven photocatalytic material water treatment performance. The invention uses a water tank to hold the sewage to be treated; uses a sample fixing frame to place the photocatalytic material to be tested; uses a water pump to make the sewage to be treated flow from the water tank along the water inlet pipe to two drip pipes, and then flows out through the drainage holes along the light to be measured. The two sides of the surface of the catalytic material flow into the water tank; the light sources on both sides are respectively illuminated on both sides of the photocatalytic material through the simulated sunlight filter, so as to realize the evaluation of the water treatment performance of the photocatalytic material driven by simulated sunlight. The device for evaluating the water treatment performance of photocatalytic materials driven by simulated sunlight provided by the present invention is simple and convenient to use, does not need to be assembled according to different photocatalytic samples, and has high evaluation efficiency.

Description

An evaluation device and evaluation device for water treatment performance of photocatalytic materials driven by simulated sunlight price method

technical field

The invention relates to the technical field of water treatment, in particular to an evaluation device and evaluation method for water treatment performance of a photocatalytic material driven by simulating sunlight.

Background technique

Solar energy is an abundant and green energy source, mainly manifested as sunlight. At present, the utilization of solar energy is mainly concentrated on generating electricity or supplying energy for water heaters. In the case of decreasing fossil fuels, solar energy has become an important part of the energy available to human beings and has developed rapidly. At present, a large number of scientific researchers in our country are devoted to the research related to solar energy. In recent years, photocatalytic technology has also been developed very well. As an emerging environment-friendly energy technology, it can effectively realize the conversion of solar energy into chemical energy. A large number of studies have shown that photocatalytic technology can be effectively used for the oxidative degradation of pollutants in water without consuming its own and other energy sources.

At present, a large number of studies are solely exploring the photocatalytic water treatment performance of materials driven by ultraviolet light or visible light. Research under such conditions makes it impossible to accurately estimate the actual utilization rate of sunlight in photocatalytic reactions. Moreover, the performance evaluation of most photocatalytic materials is to temporarily build corresponding evaluation devices through laboratory utensils, and the evaluation efficiency of traditional evaluation methods is low. Usually, it is only a small-scale laboratory evaluation and cannot be used for actual estimation.

Contents of the invention

The purpose of the present invention is to provide an evaluation device and evaluation method for simulating the sunlight-driven photocatalytic material water treatment performance. The evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the invention is simple and convenient to use and has high evaluation efficiency.

The invention provides an evaluation device for simulating sunlight-driven photocatalytic material water treatment performance, which comprises a water tank, a sample holder vertically arranged above the water tank, and two filters arranged in parallel on both sides of the sample holder in turn. A light sheet placement frame, two light sources, and a water circulation system; simulated sunlight filters are placed on the two light filter placement frames;

The water circulation system includes a water inlet pipe, a water pump and two drip pipes; the two ends of the water inlet pipe are respectively connected with the bottom of the water tank and the water inlet of the water pump; one end of the two water drip pipes is connected with the water outlet of the water pump, and the other end Blocking: the two drip tubes are arranged in parallel on both sides directly above the sample holder, and the side walls of the two drip tubes opposite to the sample holder are provided with drainage holes.

Preferably, the sample holder includes a limit slot at the bottom, a sample test plate insertion port at the top, and support rods at both sides.

Preferably, the distances between the two filter holders and the plane where the sample holder is located are independently 3-10 cm.

Preferably, the distances between the two light sources and the plane where the sample holder is located are independently 5-30 cm.

Preferably, the light source includes lamp tubes arranged in parallel.

Preferably, the dripping pipe communicates with the water outlet of the water pump through a water delivery pipe, and the water delivery pipe is provided with a flow regulating valve.

Preferably, the horizontal distance between the drainage hole and the top of the sample holder is 1-5 cm, and the vertical distance is 0-5 cm.

Preferably, the diameter of the drainage hole is 1-10mm.

Preferably, the distribution density of the drainage holes is 20-500 holes/m.

The present invention also provides a method for evaluating the water treatment performance of photocatalytic materials driven by simulating sunlight, using the evaluation device described in the above technical solution, including the following steps:

(1) Place the photocatalytic material on the sample holder, and place the sewage to be treated in the water tank;

(2) Turn on the water pump to make the sewage to be treated flow to the two drip pipes along the water inlet pipe, flow out through the drain hole, and then flow into the water tank along both sides of the surface of the photocatalytic material to be tested, so as to realize the circulation of the sewage to be treated;

(3) Turn on the light sources on both sides, so that the light is respectively illuminated by the simulated sunlight filter on the surfaces of both sides of the photocatalytic material for photocatalytic reaction, and the concentration of pollutants in the sewage to be treated before and after the photocatalytic reaction is measured.

Compared with the prior art, the present invention has achieved the following technical effects:

The evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the present invention includes a water tank, a sample holder vertically arranged above the water tank, and two optical filters arranged in parallel on both sides of the sample holder in turn. frame and two light sources, and a water circulation system; the simulated sunlight filter is placed on the two filter placement frames; the water circulation system includes a water inlet pipe, a water pump and two drip pipes; the two water inlet pipes One end of the two drip tubes communicates with the water inlet of the water pump respectively; one end of the two drip tubes communicates with the water outlet of the water pump, and the other end is blocked; side, and the side walls of the two drip tubes opposite to the sample holder are provided with drainage holes. The invention uses a water tank to hold the sewage to be treated; uses a sample fixing frame to place the photocatalytic material to be tested; uses a water pump to make the sewage to be treated flow from the water tank along the water inlet pipe to two drip pipes, and then flows out through the drainage holes along the light to be measured. The two sides of the surface of the catalytic material flow into the water tank; the light sources on both sides are respectively illuminated on both sides of the photocatalytic material through the simulated sunlight filter, so as to realize the evaluation of the water treatment performance of the photocatalytic material driven by simulated sunlight. The device for evaluating the water treatment performance of photocatalytic materials driven by simulated sunlight provided by the present invention is simple and convenient to use, does not need to be assembled according to different photocatalytic samples, and has high evaluation efficiency.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

Fig. 1 is the front view of the evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the embodiment of the present invention;

2 is a top view of an evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by an embodiment of the present invention;

3 is a side view of an evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by an embodiment of the present invention;

In the figure, 1 is a water tank, 2 is a sample holder, 3 is a filter holder, 4 is a light source, 5 is a water inlet pipe, 6 is a water pump, 7 is a drip pipe, 8 is a drain hole, and 9 is a limit groove. 10 is a sample test plate insertion port, 11 is a support rod, 12 is a water pipe, 13 is a flow regulating valve, 14 is a flow meter, 15 is a water retaining plate, 16 is a blowing cooling device, and 17 is a simulated sunlight filter;

Fig. 4 is the front view of the lamp tube frame in the evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the embodiment of the present invention;

Fig. 5 is the front view of the sample holder in the evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the embodiment of the present invention;

Fig. 6 is an effect diagram of photocatalytic material degrading methylene blue in Example 2 of the present invention.

detailed description

The invention provides an evaluation device for simulating sunlight-driven photocatalytic material water treatment performance, which comprises a water tank, a sample holder vertically arranged above the water tank, and two filters arranged in parallel on both sides of the sample holder in turn. A light sheet placement frame, two light sources, and a water circulation system; simulated sunlight filters are placed on the two light filter placement frames;

The water circulation system includes a water inlet pipe, a water pump and two drip pipes; the two ends of the water inlet pipe are respectively connected with the bottom of the water tank and the water inlet of the water pump; one end of the two water drip pipes is connected with the water outlet of the water pump, and the other end Blocking: the two drip tubes are arranged in parallel on both sides directly above the sample holder, and the side walls of the two drip tubes opposite to the sample holder are provided with drainage holes.

As shown in FIG. 1 , the evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the present invention includes a water tank 1 . The present invention has no special limitation on the shape and size of the water tank, which can be adjusted according to the usage conditions. In the present invention, the water tank is preferably a cuboid; the length of the water tank is preferably 0.3-2m, more preferably 0.5-1.5m; the width of the water tank is preferably 0.1-0.8m, more preferably 0.3-0.6m ; The height of the water tank is preferably 0.05-0.5m, more preferably 0.1-0.3m. In the present invention, the water tank is used to hold sewage to be treated; preferably, a volume scale is provided on the side wall of the water tank, and the scale can control the amount of water added and record the total water treatment amount.

As shown in FIG. 1 , the evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the present invention includes a sample holder 2 vertically arranged above the water tank 1 . In the present invention, there is no special limitation on the distance between the sample fixing frame and the water tank, and it can be adjusted according to actual needs. In the present invention, the distance between the bottom end of the sample holder and the top of the tank is preferably 0-20 cm, more preferably 5-15 cm, and most preferably 8-12 cm.

In one embodiment of the present invention, the sample holder 2 includes a limiting groove 9 at the bottom, a sample testing plate insertion opening 10 at the top, and support rods 11 at both sides. Specifically, the sample holder 2 is a square frame, the bottom of the frame is a limiting groove 9 , the top of the frame is a sample test plate insertion port 10 , and the two sides of the frame are support rods 11 . In the present invention, there is no special limitation on the size of the sample fixing frame, as long as the water flows through the samples and all falls into the water tank. In the present invention, the sample holder 2 is used to place a sample of the photocatalytic material to be tested; the sample is inserted into the sample holder 2 through the sample test plate insertion port 10, and passes through the limiting groove 9 and the support rods 11 on both sides. fixed.

As shown in Fig. 1 and Fig. 2, the evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the present invention comprises two optical filter placement racks 3 and two a light source 4. In the present invention, the distance between the two filter holders 3 and the plane where the sample holder is located is preferably independently 3-10 cm, more preferably 5-8 cm, and most preferably 6-7 cm. In an embodiment of the present invention, the two optical filter placement frames are arranged symmetrically with respect to the sample fixing frame.

In the present invention, the simulated sunlight filter 17 is placed on the filter holder. In the present invention, the same optical filter is preferably placed on the two optical filter placement frames. In the present invention, the simulated sunlight filter can make the filtered light close to the spectrum of sunlight. In the present invention, the size of the optical filter holder is preferably not smaller than that of the sample holder, so as to ensure that all the light shining on the sample is filtered by the optical filter. More preferably, the filter holder is 2-5 cm longer than the sample holder and 2-5 cm wider than the sample holder.

In the present invention, the distance between the two light sources and the plane where the sample holder is located is preferably independently 5-30 cm, more preferably 8-20 cm, most preferably 10-15 cm. In an embodiment of the present invention, the two light sources are arranged symmetrically with respect to the sample holder. In the present invention, there is no special limitation on the type of the light source, and a light source for photocatalysis well known to those skilled in the art can be used. In the present invention, the two light sources are preferably the same light source.

In an embodiment of the present invention, the light source includes lamp tubes arranged in parallel; the lamp tube may specifically include one of mercury lamps, dysprosium lamps, xenon lamps, metal halide lamps, fluorescent lamps, LED lamps and OLED lamps. In the present invention, the wattage of the lamp tube is preferably 5-1000W, more preferably 8-500W, most preferably 20-100W. The present invention has no special limitation on the number of the lamp tubes, which can be adjusted according to actual needs. In the present invention, the number of the lamp tubes is preferably 1-200, more preferably 5-100, and most preferably 10-50. In an embodiment of the present invention, when the number of the corresponding lamp tubes is more than 3, the lamp tubes are equidistantly and evenly distributed. As shown in Fig. 4, in the embodiment of the present invention, the lamp tube is fixed on the lamp tube frame.

In the present invention, there is no special limitation on the fixing methods of the sample fixing frame, optical filter placing frame and light source, and mechanical fixing methods well known to those skilled in the art can be used. In an embodiment of the present invention, two lamp tube racks are connected by an integral frame, and a slot is provided in the middle of the overall frame, and the slot is used to place a sample fixing frame, and a Filter holder. Specifically, as shown in Figure 5, the sample holder is supported by two upper and lower clamping rods. Set the lifting ring, and the sample holder can be taken out from the slot by pulling up the lifting ring.

As shown in FIG. 1 , in one embodiment of the present invention, a blower cooling device 16 is provided above the lamp tube. In the present invention, there is no special limitation on the distance between the air blowing cooling device and the lamp tube, which can be adjusted according to actual needs. In the present invention, the distance between the blowing cooling device and the lamp tube is preferably 5-30 cm, more preferably 10-25 cm, and most preferably 15-20 cm. In the present invention, the air blowing cooling device is used to blow air to the lamp tube to promote heat dissipation of the lamp tube.

As shown in Figure 1, the evaluation device for simulating sunlight-driven photocatalytic material water treatment performance provided by the present invention includes a water circulation system; the water circulation system includes a water inlet pipe 5, a water pump 6 and two drip pipes 7; the water inlet pipe 5 The two ends of the water tank are communicated with the water inlet of the water tank bottom and the water pump 6 respectively; one end of the two drip tubes 7 is communicated with the water outlet of the water pump 6, and the other end is blocked; the two drip tubes 7 are arranged in parallel on the sample Drainage holes 8 are provided on both sides directly above the fixing frame, and on the side walls of the two drip tubes 7 opposite to the sample fixing frame 2 . In the present invention, the water circulation system circulates the sewage to be treated; the water pump diverts the sewage to be treated in the water tank to the drip pipe through the water inlet pipe, and then flows out from the drain holes of the two drip pipes respectively, and passes through the sample The surface flows into the sink.

In the present invention, there is no special limitation on the size of the drip pipe, which can be adjusted according to actual needs. In the present invention, the diameters of the two drip tubes are preferably independently 1-10 cm, more preferably 1.5-6 cm, and most preferably 2-4 cm. In the present invention, the two drip tubes are preferably arranged symmetrically with respect to the plane where the sample holder is located.

In the present invention, the horizontal distance between the drainage hole and the top of the sample holder is preferably 1-5 cm, more preferably 2-4 cm; the vertical distance is preferably 0-5 cm, more preferably 2-4 cm. In the present invention, the diameter of the drainage hole is preferably 1-10 mm, more preferably 2-8 mm, and most preferably 4-6 mm. In the present invention, the distribution density of the drainage holes is preferably 20-500 holes/m, more preferably 50-400 holes/m, and most preferably 100-300 holes/m. In the present invention, the drainage holes ensure that the water flows evenly across the surface of the photocatalytic material sample to be tested.

As shown in FIG. 1 , in an embodiment of the present invention, the dripping pipe 7 communicates with the water outlet of the water pump 6 through a water delivery pipe 12 . In one embodiment of the present invention, the water delivery pipe is provided with a flow regulating valve. As shown in FIG. 1 , in one embodiment of the present invention, the water delivery pipe 12 further includes a branch pipe communicating with the water tank, and a flow regulating valve 13 is provided on the branch pipe. In one embodiment of the present invention, the water delivery pipe 12 is further provided with a flow meter 14 . In the present invention, the flow regulating valve is used to regulate the flow of sewage to be treated flowing into the drip pipe by controlling the water flow circulating into the water tank, and the flow meter records the steady circulating water flow flowing into the drip pipe.

In one embodiment of the present invention, a water baffle 15 is provided between the drip pipe 7 and the light source 4 . The present invention has no special limitation on the position and size of the water baffle, as long as it can prevent the water flowing out of the drip tube from splashing on the light source without blocking the light source from shining on the sample. In an embodiment of the present invention, the water retaining plate is a square plate; the length of the water retaining plate is preferably the same as the width of the light source, and the width of the water retaining plate is preferably 5-10 cm, more preferably 6-8 cm.

The present invention also provides a method for evaluating the water treatment performance of photocatalytic materials driven by simulating sunlight, using the evaluation device described in the above technical solution, including the following steps:

(1) Place the photocatalytic material on the sample holder, and place the sewage to be treated in the water tank;

(2) Turn on the water pump to make the sewage to be treated flow to the two drip pipes along the water inlet pipe, flow out through the drain hole, and then flow into the water tank along both sides of the surface of the photocatalytic material to be tested, so as to realize the circulation of the sewage to be treated;

(3) Turn on the light sources on both sides, so that the light is respectively illuminated by the simulated sunlight filter on the surfaces of both sides of the photocatalytic material for photocatalytic reaction, and the concentration of pollutants in the sewage to be treated before and after the photocatalytic reaction is measured.

In the invention, the photocatalytic material is placed on the sample fixing frame, and the sewage to be treated is placed in the water tank. In the present invention, there is no special limitation on the type of the photocatalytic material, and photocatalytic materials well known to those skilled in the art can be used. In the present invention, the photocatalytic material is preferably a film-like material, a fibrous fabric-like material, a plate or a sheet. In the present invention, the photocatalytic material is preferably inserted into the sample holder through the sample test plate insertion port, and fixed with the support rods on both sides through the limiting groove.

The present invention has no special limitation on the amount of sewage to be treated, and it can be adjusted according to actual needs. In the present invention, the volume of the sewage to be treated is preferably 0.5-500L, more preferably 1-300L, and most preferably 10-100L. The present invention has no special limitation on the types of pollutants in the sewage to be treated, which can be selected according to actual needs. In the present invention, the pollutants in the sewage to be treated preferably include one or more of dyes, medicines, personal care products and organic pesticides. In the present invention, there is no special limitation on the concentration of pollutants in the sewage to be treated, which can be selected according to actual needs. In the present invention, the molar concentration of the pollutants in the sewage to be treated is preferably 10 ^-6 to ^{10 -3 mol} /L, more preferably 10 ^-5 to 10 ^-4 mol/L.

After the placement of the photocatalytic material and the sewage to be treated is completed, the invention turns on the water pump to make the sewage to be treated flow to the two drip pipes along the water inlet pipe, flow out through the drain hole, and then flow into the water tank along both sides of the surface of the photocatalyst material to be tested, so as to realize the Treat the circulating flow of sewage. In the present invention, the sewage to be treated preferably flows into the two drip pipes respectively through the water delivery pipe under the action of the water pump. In the present invention, the flow of sewage to be treated is preferably adjusted through a flow regulating valve. In the present invention, there is no special limitation on the flow rate of the sewage to be treated, and it shall prevail that the water flow can flow evenly across the surface of the photocatalytic material. In the present invention, the flow rate of the sewage to be treated is preferably 0.1-2000L/h, more preferably 10-1500L/h, and most preferably 100-1000L/h. In the present invention, the pressure of the water flow is preferably 0.1-1 MPa, more preferably 0.4-0.8 MPa.

After the sewage to be treated circulates, the invention turns on the light sources on both sides, so that the light passes through the simulated sunlight filter and shines on the surfaces of both sides of the photocatalytic material for photocatalytic reaction, and measures the concentration of pollutants in the sewage to be treated before and after the photocatalytic reaction. In the present invention, there is no special limitation on the method for measuring the concentration of the pollutants, and the method for measuring the concentration of substances well known to those skilled in the art can be used. In the present invention, the determination of the concentration of pollutants preferably includes ultraviolet-visible spectrophotometry, high-performance liquid chromatography, high-performance liquid chromatography-mass spectrometry, gas chromatography-mass spectrometry, chemical oxygen demand One or more of quantitative determination method, biological oxygen demand determination method, total organic carbon content determination method and titration method. In the present invention, the water treatment performance of the photocatalytic material is evaluated by measuring the concentration of pollutants in a certain amount of sewage to be treated before and after the photocatalytic reaction for a period of time.

In order to further illustrate the present invention, the following examples describe in detail the evaluation device and evaluation method for the water treatment performance of photocatalytic materials driven by simulated sunlight provided by the present invention, but they cannot be interpreted as limiting the protection scope of the present invention.

Example 1:

In this embodiment, the evaluation device for simulating the sunlight-driven photocatalytic material water treatment performance includes a water tank, a sample holder vertically arranged above the water tank, and two optical filters arranged in parallel on both sides of the sample holder in turn. frame and two light sources, and a water circulation system; the simulated sunlight filter is placed on the two filter placement frames; the water circulation system includes a water inlet pipe, a water pump and two drip pipes; the two water inlet pipes One end of the two drip tubes communicates with the water inlet of the water pump respectively; one end of the two drip tubes communicates with the water outlet of the water pump, and the other end is blocked; side, and the side walls of the two drip tubes opposite to the sample holder are provided with drainage holes.

The sample holder is a detachable 35cm×60cm square frame. The lamp tube rack is located on both sides of the sample fixing frame. Three lamp tubes are arranged parallel to the plane of the lamp tube rack. The lamp tube is a 50W xenon lamp. The distance between the tube rack and the plane where the sample rack is located is 10 cm. A filter holder is respectively arranged between the lamp tube holder and the sample holder on both sides, and the simulated sunlight filter is placed so that the output spectrum is close to the sunlight spectrum.

The input port of the water pump communicates with the water inlet pipe extending into the bottom of the water tank, and the output port of the water pump is diverted to two drip pipes through the water delivery pipe; the water delivery pipe is provided with a flow regulating valve and a flow meter. Each drip tube is provided with a row of drainage holes opposite to the top of the sample holder, with a hole diameter of 5mm. After the water flow regulating valve is opened, the water flow is sprayed from the drainage holes and sprayed vertically to the photocatalytic material on the sample holder at a 90-degree angle, and then along the The surface of the material flows down and flows into the water tank below, and the liquid level scale is set on the water tank to control and record the total water treatment volume. A water baffle is respectively set between the drip pipe and the lamp tube racks on both sides to prevent the water from splashing on the lamp tubes and causing danger; the distribution box is arranged on one side of the lamp tube racks.

Example 2:

Using the device in Example 1, the photocatalytic non-woven fabric of 3wt% titanium dioxide/graphitic carbon nitride is evaluated for water treatment performance:

Cut the photocatalytic material of the size of the test plate, clamp and fix it on the test plate, the photocatalytic material needs to have photocatalytic activity on both sides; put 2L of methylene blue aqueous solution with a concentration of 2×10 ^-5 mol/L in the water tank;

Turn on the water pump and adjust the flow regulating valve on the drip tube to 800L/h, the drip tube will evenly flow the water to the sample test plate and flow down its surface;

After the flow rate is stable, turn on the lamp tube, take samples at intervals, measure the pollutant content before and after a certain period of photocatalytic reaction with a UV-visible spectrophotometer, and evaluate the water treatment performance of the photocatalytic material. The effect diagram of the photocatalytic material degrading methylene blue is shown in Fig. 6, and the degradation rate reaches 95% after 70 minutes of light irradiation.

Example 3:

Replace the lamp tube in the evaluation device in Example 1 with a 100W xenon lamp, and the drain hole is opposite to the top of the sample holder, so that the water flow is sprayed to the photocatalyst material on the sample holder at an angle of 45 degrees, and the load 2wt% graphite phase nitrogen Carbonized photocatalytic nickel foam for water treatment performance evaluation:

Cut the photocatalytic material of the size of the test plate, clamp and fix it on the test plate, the photocatalytic material needs to have photocatalytic activity on both sides; put 2L of methylene blue aqueous solution with a concentration of 2×10 ^-5 mol/L in the water tank;

Turn on the water pump and adjust the flow regulating valve on the drip tube to 800L/h, the drip tube will evenly flow the water to the sample test plate and flow down its surface;

After the flow rate is stable, turn on the lamp tube, take samples at intervals, measure the pollutant content before and after a certain period of photocatalytic reaction with a UV-visible spectrophotometer, and evaluate the water treatment performance of the photocatalytic material. It is determined that the degradation rate of the light for 40 minutes reaches 97%.

Example 4:

The device in Example 1 is used to evaluate the water treatment performance of the photocatalytic nonwoven fabric loaded with 3wt% titanium dioxide/graphitic carbon nitride:

Cut the photocatalytic material of the size of the test plate, clamp and fix it on the test plate, the photocatalytic material needs to have photocatalytic activity on both sides; place 2L of methylene blue aqueous solution with a concentration of 1×10 ^-5 mol/L in the water tank;

Turn on the water pump and adjust the flow regulating valve on the drip tube to 800L/h, and the drip tube 3 will evenly flow the water to the sample test plate and flow down along its surface;

After the flow rate is stable, turn on the lamp tube, take samples at intervals, measure the pollutant content before and after a certain period of photocatalytic reaction with a UV-visible spectrophotometer, and evaluate the water treatment performance of the photocatalytic material. It is determined that the degradation rate of 40 minutes of light reaches 88%.

Example 5:

Adopt the same device of embodiment 3 to carry out water treatment performance evaluation to the photocatalytic fiber web of loading 2wt% titanium dioxide/graphitic phase carbon nitride:

Cut the photocatalytic material of the size of the test plate, clamp and fix it on the test plate, the photocatalytic material needs to have photocatalytic activity on both sides; put 2L of methylene blue aqueous solution with a concentration of 2×10 ^-5 mol/L in the water tank;

Turn on the water pump and adjust the flow regulating valve on the drip tube to 500L/h, the drip tube will evenly flow the water to the sample test plate and flow down its surface;

After the flow rate is stable, turn on the lamp tube, take samples at intervals, measure the pollutant content before and after a certain period of photocatalytic reaction with a UV-visible spectrophotometer, and evaluate the water treatment performance of the photocatalytic material. The degradation rate of 50 minutes of light is measured to reach 88%.

Embodiment 6:

Adopt the same device of embodiment 3 to carry out water treatment performance evaluation to the photocatalytic fiber web of loading 3wt% nitrogen-doped titanium dioxide:

Cut the photocatalytic material of the size of the test plate, clamp and fix it on the test plate, the photocatalytic material needs to have photocatalytic activity on both sides; place 2L of methylene blue aqueous solution with a concentration of 1×10 ^-5 mol/L in the water tank;

Turn on the water pump and adjust the flow regulating valve on the drip tube to 700L/h, the drip tube will evenly flow the water to the sample test plate and flow down its surface;

After the flow rate is stable, turn on the lamp tube, take samples at intervals, measure the pollutant content before and after a certain period of photocatalytic reaction with a UV-visible spectrophotometer, and evaluate the water treatment performance of the photocatalytic material. It is determined that the degradation rate of 25 minutes of light reaches 88%.

Embodiment 7:

The same device as in Example 3 is used to evaluate the water treatment performance of the photocatalytic nonwoven fabric loaded with 2wt% nitrogen-doped titanium dioxide:

Cut off the photocatalytic material with the size of the test board, clamp and fix it on the test board, the photocatalytic material needs to have photocatalytic activity on both sides; put 2L sulfachloropyridazine aqueous solution with a concentration of 1×10 ^-5 mol/L in the water tank ;

Turn on the water pump and adjust the flow regulating valve on the drip tube to 800L/h, the drip tube will evenly flow the water to the sample test plate and flow down its surface;

After the flow rate is stable, turn on the lamp tube, take samples at intervals, and measure the pollutant content before and after a certain period of photocatalytic reaction by high performance liquid chromatography, and evaluate the water treatment performance of the photocatalytic material. It is determined that the degradation rate of 120 minutes of light reaches 94%.

It can be seen from the above examples that the device for evaluating the water treatment performance of photocatalytic materials driven by simulated sunlight provided by the present invention is simple and convenient to use, does not need to be assembled according to different photocatalytic samples, and has high evaluation efficiency.

The above descriptions are only preferred embodiments of the present invention, and do not limit the present invention in any form. It should be pointed out that those skilled in the art can make some improvements and modifications without departing from the principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims (10)

1. An evaluation device for simulating sunlight-driven photocatalytic material water treatment performance, comprising a water tank, a sample holder vertically arranged above the water tank, and two filters arranged in parallel on both sides of the sample holder in turn A placement frame, two light sources, and a water circulation system; simulated sunlight filters are placed on the two filter placement frames; The water circulation system includes a water inlet pipe, a water pump and two drip pipes; the two ends of the water inlet pipe are respectively connected with the bottom of the water tank and the water inlet of the water pump; one end of the two water drip pipes is connected with the water outlet of the water pump, and the other end Blocking: the two drip tubes are arranged in parallel on both sides directly above the sample holder, and the side walls of the two drip tubes opposite to the sample holder are provided with drainage holes. 2 . The evaluation device according to claim 1 , wherein the sample holder comprises a limit slot at the bottom, a sample test plate insertion port at the top, and support rods at both sides. 3 . 3. The evaluation device according to claim 1 or 2, characterized in that, the distance between the two filter placement frames and the plane where the sample fixing frame is located is independently 3-10 cm. 4. The evaluation device according to claim 1 or 2, wherein the distances between the two light sources and the plane where the sample holder is located are independently 5-30 cm. 5. The evaluation device according to claim 4, wherein the light source comprises lamp tubes arranged in parallel. 6 . The evaluation device according to claim 1 , wherein the dripping pipe communicates with the water outlet of the water pump through a water delivery pipe, and the water delivery pipe is provided with a flow regulating valve. 7 . 7. The evaluation device according to claim 1, wherein the horizontal distance between the drain hole and the top of the sample holder is 1-5 cm, and the vertical distance is 0-5 cm. 8. The evaluation device according to claim 1 or 7, characterized in that the diameter of the drainage hole is 1-10 mm. 9 . The evaluation device according to claim 8 , wherein the distribution density of the drainage holes is 20 to 500 holes/m. 10. A method for evaluating the water treatment performance of photocatalytic materials driven by simulated sunlight, using the evaluation device described in any one of claims 1 to 9, comprising the following steps: (1) Place the photocatalytic material on the sample holder, and place the sewage to be treated in the water tank; (2) Turn on the water pump to make the sewage to be treated flow to the two drip pipes along the water inlet pipe, flow out through the drain hole, and then flow into the water tank along both sides of the surface of the photocatalytic material to be tested, so as to realize the circulation of the sewage to be treated; (3) Turn on the light sources on both sides, so that the light is respectively illuminated by the simulated sunlight filter on the surfaces of both sides of the photocatalytic material for photocatalytic reaction, and the concentration of pollutants in the sewage to be treated before and after the photocatalytic reaction is measured.