CN109999855A - A kind of carbon cloth@BiOBr optic catalytic composite material and preparation method thereof - Google Patents

Abstract

The invention relates to a carbon cloth@BiOBr photocatalytic composite material and a preparation method thereof. The preparation method comprises the following steps: a. placing the carbon cloth in acetone, ethanol and deionized water in sequence and immersing it in ultrasonic waves for a certain period of time; and then placing the carbon cloth in In the vacuum drying oven, vacuum drying is used at a certain temperature for subsequent use; b. potassium bromide is dissolved in the glycerol aqueous solution, and stirred to form a potassium bromide solution; c. a certain amount of potassium bromide solution is added to the potassium bromide solution. Bismuth nitrate pentahydrate and PVP, stir and ultrasonic for a certain period of time to form a mixed transparent solution; d. add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, and place the reaction kettle in a constant temperature box , after a certain time of reaction at a constant temperature, the product is obtained. The method has the advantages of simple preparation process, low equipment requirements, high controllability, uniform product, novel appearance, excellent visible light photocatalytic performance, and wide application in energy and environmental protection industries.

Description

A carbon cloth@BiOBr photocatalytic composite material and preparation method thereof

technical field

The invention belongs to the technical field of preparation technology of semiconductor nanomaterials, and relates to a carbon cloth@BiOBr photocatalytic composite material and a preparation method thereof.

technical background

With the continuous development of industrialization, environmental pollution has become more and more serious, and the prevention and control of water pollution has become one of the focuses of attention. At present, the commonly used methods for water pollution control include physical and chemical methods, biochemical degradation methods, electrochemical treatment methods, and photocatalysis methods. Among them, photocatalysis is a green sewage treatment method in which photocatalysts degrade organic pollutants into inorganic small molecules such as CO ₂ and H ₂ O under light conditions. In the process of degradation, the photocatalyst is not consumed, has no secondary pollution, utilizes sunlight, and is highly efficient and environmentally friendly. Since its birth in the 1970s, photocatalytic technology has been widely used in the field of environmental photocatalysis and energy photocatalysis after more than 40 years of development. It can be said that photocatalytic technology has become an effective way to alleviate the increasingly severe environmental and energy problems. However, most of the current semiconductor photocatalytic materials still have problems such as narrow light absorption range, fast recombination of photogenerated carriers, and low photoelectric conversion efficiency. In addition, nano-sized photocatalytic materials have large specific surface area and high activity, but they are difficult to separate and recycle. At present, it is difficult to find a suitable carrier that not only maintains the activity of the catalyst itself but also meets the physical and chemical performance requirements of specific materials. Therefore, there is still a long way to go to realize the large-scale industrial application of photocatalytic materials.

It is generally believed that the photocatalytic reaction includes the following three processes: (1) the semiconductor absorbs sunlight to excite photo-generated electrons and holes, (2) the photo-generated electrons and holes are separated and migrate to the semiconductor surface, and (3) the photo-generated electrons and holes on the semiconductor surface participate in the reduction, respectively. reactions and oxidation reactions. The number of UV photons in the solar spectrum is less than 5%, resulting in traditional photocatalytic materials such as _TiO and ZnO that can only utilize a small and medium portion of the photon energy in the solar spectrum. In addition, photogenerated carriers also suffer from severe radiative and nonradiative recombination in vivo and surface recombination in vitro, resulting in lower utilization of sunlight in the photocatalytic process. Therefore, an efficient photocatalytic process depends not only on the utilization of visible and infrared light by the semiconductor material, but also on its ability to suppress the recombination of photogenerated carriers. Over the years, people have improved the separation efficiency of photogenerated carriers through structural design. For example, by increasing the crystallinity, reducing the size and other means to inhibit the in vivo recombination, introducing a co-catalyst to reduce the surface recombination and so on. However, a single photocatalytic semiconductor material still cannot meet the harsh conditions of wide light absorption range, low photogenerated carrier recombination rate and suitable conduction band or valence band potential at the same time. Composite photocatalytic materials emerge as the times require under this research background. The composite photocatalytic system has opened up a new situation for the utilization of photocatalytic technology. Whether it is light absorption characteristics, carrier separation characteristics, photocatalytic performance, or material recovery performance and cost control, it has achieved significantly better than unit photocatalytic semiconductor materials. Effect.

Activated carbon fiber has large specific surface area and pore volume, small pore size and uniform pore size. Activated carbon fiber has a good adsorption capacity for water-soluble organic compounds containing oxygen, chlorine, aromatic rings, etc. In addition to enriching the pollutants on the surface of the catalyst and improving the quantum yield of the photocatalyst, activated carbon fibers can also effectively adsorb the by-products in the photocatalytic reaction process, so that the pollutants can be continuously degraded until they are completely mineralized into small molecular inorganic substances. The rate of this adsorption-migration-photodegradation reaction process is much higher than that of a single catalyst directly adsorbing organic matter from solution and degrading it, thereby improving the photocatalytic reaction efficiency of a single catalyst.

SUMMARY OF THE INVENTION

The primary technical problem to be solved by the present invention is to provide a preparation method of a flexible carbon cloth, which is simple in process, low in cost, short in reaction period and uniform, and easy to recycle photocatalytic composite material.

A preparation method of carbon cloth@BiOBr photocatalytic composite material, comprising the following steps:

a. The carbon cloth is placed in acetone, ethanol, and deionized water for a certain period of time and then immersed in ultrasonic waves; then the carbon is placed in a vacuum drying oven, and vacuum dried at a certain temperature for use; b. The potassium bromide is dissolved in glycerol In the aqueous solution, stir to form potassium bromide solution; c. add a certain amount of bismuth nitrate pentahydrate and PVP (polyvinylpyrrolidone) to the potassium bromide solution, stir and ultrasonic for a certain time, form a mixed transparent solution; d. The mixed solution and the pre-treated carbon cloth are added to the tetrafluoroethylene reaction kettle, and the reaction kettle is placed in a constant temperature box, and after a certain period of reaction at a constant temperature, a flexible carbon cloth and easy-to-recycle photocatalytic composite material are obtained. .

Further, the soaking ultrasonic time in the step a is 5-20 minutes; the vacuum drying temperature is 30-80°C.

Further, the amount of potassium bromide in the step b is 0.5-3 mmol.

Further, the amount of bismuth nitrate pentahydrate in the step c is 0.5-3 mmol.

Further, the amount of PVP in the step c is 0.1-2g.

Further, the ultrasonic time of the step c is 10-50 minutes, and the stirring time is 30-120 minutes.

Further, the constant temperature of the step d is 100-200°C, and the reaction time is 3-12h.

The present invention also includes a flexible carbon cloth easy-to-recycle photocatalytic composite material, and the flexible carbon cloth@BiOBr easy-to-recycle photocatalytic composite material prepared by using any of the above-mentioned preparation methods.

Compared with the prior art, the present invention has outstanding effects as follows: the preparation method of the carbon cloth@BiOBr photocatalytic composite material of the present invention is a liquid phase method, the preparation process is simple, the equipment requirements are low, and the degree of controllability is high. Through reasonable process control, the preparation of carbon cloth@BiOBr photocatalytic composites is realized. The composites have uniform size, good dispersion, novel morphology, excellent photocatalytic performance, and have wide applications in energy and environmental protection industries.

Description of drawings

1 is a scanning electron microscope (SEM) photograph of the carbon cloth@BiOBr photocatalytic composite prepared in Example 2.

2 is a scanning electron microscope (SEM) photograph of the carbon cloth@BiOBr photocatalytic composite prepared in Example 2.

Detailed ways

The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited.

Example 1

A preparation method of carbon cloth@BiOBr photocatalytic composite material, the specific steps are as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 15 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 2

A preparation method of carbon cloth@BiOBr photocatalytic composite material, the specific steps are as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Figure 1-2 is the SEM of the carbon cloth@BiOBr photocatalytic composite material prepared by this method. It can be seen from the accompanying drawings that the carbon cloth@BiOBr photocatalytic composite material was successfully prepared, and the size was uniform, and the carbon cloth@BiOBr photocatalytic composite was successfully prepared. The catalytic composite material has a spherical structure, and needle-shaped bodies are distributed on the outer surface of the spherical structure, and the needle-shaped bodies are perpendicular to the outer surface of the spherical structure.

Example 3

The difference between this embodiment and embodiment 2 is that the amount of potassium bromide and bismuth nitrate pentahydrate is changed to 1.2mmol, and others are identical with embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 1.2 mmol potassium bromide was dissolved in the aqueous glycerol solution and stirred to form a potassium bromide solution;

c. adding 1.2mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonicating for 30 minutes, and then magnetically stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 4

The difference between this example and Example 2 is that the amount of PVP is changed to 0.4g, and the others are the same as Example 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.4g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 5

The difference between this embodiment and embodiment 2 is that the stirring time is changed to 60min, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 60 minutes until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 6

The difference between this embodiment and embodiment 2 is that the soaking time in step a is changed to 15 minutes, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 15 minutes in turn, and sonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and dry it in a vacuum at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 7

The difference between this embodiment and embodiment 2 is that the drying temperature is changed to 60 ° C, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in turn, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 60°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 8

The difference between this embodiment and embodiment 2 is that the reaction time is changed to 8 hours, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 8 hours to obtain the product.

Example 9

The difference between this embodiment and embodiment 2 is that the reaction temperature is changed to 140 ° C, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 140° C. for 12 hours to obtain the product.

Example 10

The difference between this embodiment and embodiment 2 is that the reaction temperature is changed to 160 ° C, and the others are the same as those of embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 160° C. for 12 hours to obtain the product.

Example 11

The difference between this embodiment and embodiment 2 is that the reaction temperature is changed to 180 ° C, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 180° C. for 12 hours to obtain the product.

Example 12

The difference between this embodiment and embodiment 2 is that the amount of potassium bromide and bismuth nitrate pentahydrate is changed to 2.4mmol, and others are identical with embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 2.4 mmol potassium bromide was dissolved in the aqueous glycerol solution and stirred to form a potassium bromide solution;

c. adding 2.4mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 13

The difference between this example and Example 2 is that the amount of PVP is changed to 0.8g, and the others are the same as Example 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.8g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 14

The difference between this example and Example 2 is that the amount of PVP is changed to 1.6g, and the others are the same as Example 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 1.6g PVP to the potassium bromide solution, ultrasonicating for 30 minutes, and then magnetically stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Example 15

The difference between this embodiment and embodiment 2 is that the reaction time is changed to 6h, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 6 hours to obtain the product.

Example 16

The difference between this embodiment and embodiment 2 is that the reaction time is changed to 4h, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in sequence, and ultrasonicate for 15 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 4 hours to obtain the product.

Example 17

The difference between this embodiment and embodiment 2 is that in step a, the ultrasonic time is changed to 10 minutes, and the other is the same as embodiment 2, as follows:

a. Soak the carbon cloth in acetone, ethanol, and deionized water for 10 minutes in turn, and ultrasonicate for 10 minutes respectively; then arrange the carbon in a vacuum drying box, and vacuum dry it at 40°C for later use;

b. 0.6mmol potassium bromide is dissolved in the glycerol aqueous solution, stirring, forms potassium bromide solution;

c. adding 0.6mmol of bismuth nitrate pentahydrate and 0.2g PVP to the potassium bromide solution, ultrasonication for 30 minutes, and then magnetic stirring for 2 hours until the solution is completely dissolved, forming a mixed transparent solution;

d. Add the mixed solution and the pretreated carbon cloth into the tetrafluoroethylene reaction kettle, put the reaction kettle into a constant temperature box, and react at 120° C. for 12 hours to obtain the product.

Claims (9)

1. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material, which comprises the following steps:

A. carbon cloth is sequentially placed into acetone, ethyl alcohol, impregnates ultrasonic certain time in deionized water respectively；Then carbon cloth is placed in very In empty drying box, vacuum drying is spare at a certain temperature；

B. potassium bromide is dissolved in glycerin solution, is stirred, form potassium bromide solution；

C. a certain amount of five water bismuth nitrate and PVP, stirring and ultrasonic certain time will be added in the potassium bromide solution, formed mixed Close clear solution；

D. the carbon cloth of the mixed solution and pre-treatment is added in tetrafluoroethene reaction kettle, and reaction kettle is put into constant temperature In case, reacted under steady temperature after a certain period of time to get to product.

2. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material as described in claim 1, which is characterized in that described The immersion ultrasonic time of step a is 5-20 minutes.

3. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material as described in claim 1, which is characterized in that described The vacuum drying temperature of step a is 30-80 DEG C.

4. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material as described in claim 1, which is characterized in that described The amount of the potassium bromide of step b is 0.5-3mmol.

5. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material as claimed in claim 4, which is characterized in that described The amount of the five water bismuth nitrates of step c is 0.5-3mmol.

6. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material as claimed in claim 5, which is characterized in that described The amount of the PVP of step c is 0.1-2g.

7. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material as described in claim 1, which is characterized in that described The ultrasonic time of step c is 10-50 minutes, and mixing time is 30-120 minutes.

8. a kind of preparation method of carbon cloth@BiOBr optic catalytic composite material as described in claim 1, which is characterized in that described Step d steady temperature be 100-200 DEG C, reaction time 3-12h.

9. a kind of carbon cloth@BiOBr optic catalytic composite material, which is characterized in that use the preparation of any one of the claims 1-8 Method is prepared, and the carbon cloth BiOBr optic catalytic composite material is in chondritic, the appearance EDS maps of the chondritic It is spicule, outer surface of the spicule perpendicular to chondritic.