CN108162111B - A kind of preparation method of veneer veneer with photocatalytic function - Google Patents

Abstract

A preparation method of veneer veneer with photocatalytic function relates to a preparation method of veneer veneer. The object of the present invention is to solve the problems that the preparation cost of existing bismuth-based photocatalytic wood is high, toxic gas is easily generated during processing and the photocatalytic effect is poor. Methods: 1. Prepare mixed solution A; 2. Prepare mixed solution B; 3. Prepare reaction solution; The veneer with photocatalytic function prepared by the present invention can degrade 15% of RhB dye within 12 minutes. The invention can obtain a veneer veneer with photocatalytic function.

Description

A kind of preparation method of veneer veneer with photocatalytic function

technical field

The invention relates to a preparation method of veneer veneer.

Background technique

Furniture is an essential item in daily life, but the release of organic pollutants in furniture has caused harm to the human body. This question has attracted people's attention. Therefore, furniture that can degrade organic matter and is green and environmentally friendly is very popular. The existing related bismuth-based photocatalytic wood is treated by twice pressure impregnation, and the used halide salt solution may generate toxic gas during the processing. In addition, this method is dipping into one solution a first, and then dipping into another solution b. The disadvantage is that, firstly, the two processing time and cost increase, and secondly, the cost of the solution is wasted, because when starting from a After being taken out and immersed in b, the b solution cannot be reused. Third, it is uncontrollable. During the second impregnation, the generated substances may be blocked on the surface and cannot be evenly distributed in the wood. Finally, the photocatalyst is produced by using two ions to meet the precipitation reaction and pressurize to the wood surface. Cohesion is up for debate.

SUMMARY OF THE INVENTION

The object of the present invention is to solve the problems of high preparation cost of existing bismuth-based photocatalytic wood, easy generation of toxic gas and poor photocatalytic effect during processing, and to provide a preparation method of veneer veneer with photocatalytic function.

A preparation method of veneer veneer with photocatalytic function, which is specifically completed according to the following steps:

1. Preparation of mixed solution A:

Dissolving bismuth nitrate pentahydrate in nitric acid to obtain mixed solution A;

The mass of the substance of the bismuth nitrate pentahydrate described in the step 1 and the volume ratio of nitric acid are (2mmol～4mmol): (30mL～50mL);

The concentration of the nitric acid described in the step 1 is 3mol/L～5mol/L;

2. Preparation of mixed solution B;

Dissolving ammonium molybdate tetrahydrate in distilled water to obtain mixed solution B;

The mass ratio of the ammonium molybdate tetrahydrate described in step 2 to the volume ratio of distilled water is (0.3g～0.8g): (30mL～40mL);

3. Prepare the reaction solution:

The mixed solution B was added dropwise to the mixed solution A at a rate of 20 drops/min to 40 drops/min to obtain a mixed solution C; the pH value of the mixed solution C was adjusted to 25% to 28% by mass fraction of ammonia. 3.5～4, and then stir for 2h～4h at a stirring speed of 300r/min～500r/min to obtain a reaction solution;

The volume ratio of the mixed solution B described in the step 3 and the mixed solution A is (0.8～1.1):1;

Fourth, the hydrothermal reaction:

Transfer the reaction solution to the reaction kettle, then immerse the wood in the reaction solution, and then react at a temperature of 155°C to 170°C for 14h to 16h to obtain a reaction product; use deionized water to wash the reaction product 3 to 5 times , and then dried in a vacuum drying oven at a temperature of 50° C. to 55° C. for 10 hours to 14 hours to obtain veneer veneer and photocatalyst powder with photocatalytic function.

The principle and advantages of the present invention:

1. In the present invention, wood is used as a raw material, and the functional groups on the wood are used to chemically react with other raw materials to grow crystal nuclei and then crystallize photocatalysts on the wood, which are uniformly and firmly spread on the surface of the wood;

2. The present invention directly uses low-cost raw materials, and wood is involved in the processing process, and the obtained finished product is partly veneer with photocatalytic function, and partly is photocatalyst powder, and the experimental sample is fully utilized without waste;

3. The invention has low cost, saves time, can obtain bismuth molybdate photocatalyst powder while obtaining the veneer veneer with photocatalytic function, and can also be effectively used, and is green, environmentally friendly, pollution-free and waste-free;

4. In the present invention, wood participates in the reaction process, and bismuth molybdate crystals form crystal nuclei in the wood and then grow. It has a good bond with the wood and is evenly distributed;

5. The veneer veneer with photocatalytic function prepared by the present invention can utilize sunlight to degrade organic matter in the air and water. This product has the properties of non-toxic entrance and is very safe, and can be applied to the surface veneer of various furniture. , effectively contact with the air to achieve the purpose of purifying the air;

6. The veneer veneer with photocatalytic function prepared by the invention can degrade 15% of RhB dye within 12 minutes.

The invention can obtain a veneer veneer with photocatalytic function.

Description of drawings

Fig. 1 is the SEM image magnified 5000 times of the veneer veneer with photocatalytic function prepared in Example 1;

Fig. 2 is the SEM image magnified 20000 times of the veneer veneer with photocatalytic function prepared in Example 1;

Fig. 3 is the XRD pattern of the veneer veneer with photocatalytic function prepared in Example 1;

Fig. 4 is an ultraviolet-visible absorption spectrum diagram, in Fig. 4, 1 is the ultraviolet-visible absorption spectrum curve of the photocatalyst powder obtained in step 4 of Example 1, and 2 is the ultraviolet-visible absorption spectrum curve of the veneer veneer with photocatalytic function obtained in step 4 of Example 1 Visible absorption spectrum curve;

Fig. 5 is a graph of degradation kinetics of the degradation of RhB dyes under illumination with a wavelength of 554 nm for different durations; 1 in Fig. 5 is a degradation kinetics curve of the photocatalyst powder obtained in step 4 of Example 1 to degrade RhB dyes, and 2 is an embodiment The degradation kinetics curve of RhB dye degradation of veneer veneer with photocatalytic function obtained in step 4.

Detailed ways

Embodiment 1: The present embodiment is a preparation method of a veneer veneer with a photocatalytic function, which is specifically completed according to the following steps:

1. Preparation of mixed solution A:

Dissolving bismuth nitrate pentahydrate in nitric acid to obtain mixed solution A;

The mass of the substance of the bismuth nitrate pentahydrate described in the step 1 and the volume ratio of nitric acid are (2mmol～4mmol): (30mL～50mL);

The concentration of the nitric acid described in the step 1 is 3mol/L～5mol/L;

2. Preparation of mixed solution B;

Dissolving ammonium molybdate tetrahydrate in distilled water to obtain mixed solution B;

The mass ratio of the ammonium molybdate tetrahydrate described in step 2 to the volume ratio of distilled water is (0.3g～0.8g): (30mL～40mL);

3. Prepare the reaction solution:

The mixed solution B was added dropwise to the mixed solution A at a rate of 20 drops/min to 40 drops/min to obtain a mixed solution C; the pH value of the mixed solution C was adjusted to 25% to 28% by mass fraction of ammonia. 3.5～4, and then stir for 2h～4h at a stirring speed of 300r/min～500r/min to obtain a reaction solution;

The volume ratio of the mixed solution B described in the step 3 and the mixed solution A is (0.8～1.1):1;

Fourth, the hydrothermal reaction:

Transfer the reaction solution to the reaction kettle, then immerse the wood in the reaction solution, and then react at a temperature of 155°C to 170°C for 14h to 16h to obtain a reaction product; use deionized water to wash the reaction product 3 to 5 times , and then dried in a vacuum drying oven at a temperature of 50° C. to 55° C. for 10 hours to 14 hours to obtain veneer veneer and photocatalyst powder with photocatalytic function.

The principle and advantages of this embodiment:

1. In this embodiment, the wood is used as the raw material, and the functional groups on the wood are used to chemically react with the rest of the raw materials to grow crystal nuclei and then crystallize photocatalysts on the wood, which are uniformly and firmly spread on the surface of the wood;

2. In this embodiment, low-cost raw materials are directly used, and wood is involved in the processing process, and the obtained finished product is partly veneer with photocatalytic function, and partly is photocatalyst powder, and the experimental sample is fully utilized without waste;

3. This embodiment has low cost, saves time, and can obtain bismuth molybdate photocatalyst powder while obtaining the veneer veneer with photocatalytic function, which can also be effectively used, and is environmentally friendly, pollution-free and waste-free;

4. In this embodiment, the wood participates in the reaction process, and the bismuth molybdate crystals form crystal nuclei in the wood and then grow, and have a good combination with the wood and are evenly distributed;

5. The veneer veneer with photocatalytic function prepared in this embodiment can use sunlight to degrade organic matter in the air and water. This product has the performance of non-toxic entrance and is very safe, and can be applied to the surface stickers of various furniture. It can effectively contact with the air to achieve the purpose of purifying the air;

6. The veneer veneer with photocatalytic function prepared by this embodiment can degrade 15% of RhB dye within 12 minutes.

In this embodiment, a veneer veneer with photocatalytic function can be obtained.

Embodiment 2: The difference between this embodiment and Embodiment 1 is: the mass ratio of the substance of bismuth nitrate pentahydrate described in step 1 to the volume of nitric acid is (2mmol～3mmol): (30mL～40mL). Other steps are the same as in the first embodiment.

Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is: the mass ratio of the substance of the bismuth nitrate pentahydrate described in the step 1 to the volume ratio of nitric acid is (3mmol～4mmol): (40mL～ 50mL). Other steps are the same as in the first or second embodiment.

Embodiment 4: This embodiment differs from Embodiments 1 to 3 in that the concentration of nitric acid described in step 1 is 3 mol/L to 4 mol/L. Other steps are the same as those of the specific embodiments 1 to 3.

Embodiment 5: The difference between this embodiment and Embodiments 1 to 4 is: the mass ratio of the ammonium molybdate tetrahydrate described in step 2 to the volume of distilled water is (0.3g～0.5g): (30mL～ 35mL). The other steps are the same as those in the first to fourth embodiments.

Embodiment 6: The difference between this embodiment and Embodiments 1 to 5 is: the mass ratio of the ammonium molybdate tetrahydrate described in step 2 to the volume of distilled water is (0.5g～0.8g): (35mL～ 40mL). Other steps are the same as those of the specific embodiments 1 to 5.

Embodiment 7: The difference between this embodiment and Embodiments 1 to 6 is that the volume ratio of the mixed solution B and the mixed solution A described in step 3 is (0.9-1):1. Other steps are the same as those of the specific embodiments 1 to 6.

Embodiment 8: The difference between this embodiment and Embodiments 1 to 7 is that in step 3, the mixed solution B is added dropwise to the mixed solution A at a rate of 20 drops/min to 30 drops/min, and the mixed solution is obtained. Solution C; use ammonia water with a mass fraction of 27% to 28% to adjust the pH of the mixed solution C to 4, and then stir for 2h to 3h at a stirring speed of 300r/min to 400r/min to obtain a reaction solution. Other steps are the same as those of the specific embodiments 1 to 7.

Embodiment 9: The difference between this embodiment and Embodiments 1 to 8 is that in step 4, the reaction solution is transferred to the reaction kettle, and then the wood is dipped into the reaction solution, and then the temperature is 155 ℃ ~ 160 ℃ The reaction is carried out for 14h to 15h to obtain the reaction product; the reaction product is washed 3 to 4 times with deionized water, and then dried in a vacuum drying oven at a temperature of 50 to 53 °C for 10 to 12 hours to obtain a veneer with photocatalytic function. Veneer and photocatalyst powder. Other steps are the same as those of the specific embodiments 1 to 8.

Embodiment 10: The difference between this embodiment and Embodiments 1 to 9 is that: in step 4, the reaction solution is transferred to the reaction kettle, and then the wood is dipped into the reaction solution, and then the temperature is 160 ℃ ~ 165 ℃ The reaction is carried out for 15 h to 16 h to obtain the reaction product; the reaction product is washed 4 to 5 times with deionized water, and then dried for 12 h to 14 h in a vacuum drying oven with a temperature of 53 ° C to 55 ° C to obtain a veneer with photocatalytic function. Veneer and photocatalyst powder. Other steps are the same as those of the specific embodiments 1 to 9.

Adopt the following examples to verify the beneficial effects of the present invention:

Embodiment 1: a preparation method of a veneer veneer with photocatalytic function, which is specifically completed according to the following steps:

1. Preparation of mixed solution A:

3mmol of bismuth nitrate pentahydrate was dissolved in 40mL of nitric acid to obtain mixed solution A;

The concentration of the nitric acid described in the step 1 is 4mol/L;

2. Preparation of mixed solution B;

Dissolve 0.5 g of ammonium molybdate tetrahydrate into 36 mL of distilled water to obtain mixed solution B;

3. Prepare the reaction solution:

The mixed solution B obtained in the second step was added dropwise to the mixed solution A obtained in the first step at a rate of 30 drops/min to obtain a mixed solution C; the pH value of the mixed solution C was changed by using ammonia water with a mass fraction of 28%. Adjusted to 4, and then stirred at a stirring speed of 400 r/min for 3 h to obtain a reaction solution;

Fourth, the hydrothermal reaction:

The reaction solution was transferred to the reaction kettle, and then the wood was dipped into the reaction solution, and then reacted at a temperature of 160 ° C for 14 h to obtain a reaction product; the reaction product was washed with deionized water for 4 times, and then heated at a temperature of 50 ° C. Dry in a vacuum drying oven for 12 hours to obtain veneer and photocatalyst powder with photocatalytic function;

The wood described in step 4 is ash, the length of ash is 10mm, the width is 10mm, and the thickness is 0.5mm.

Fig. 1 is the SEM image magnified 5000 times of the veneer veneer with photocatalytic function prepared in Example 1;

It can be seen from Figure 1 that the bismuth molybdate photocatalyst crystals prepared in Example 1 are uniformly distributed on the wood surface.

Fig. 2 is the SEM image magnified 20000 times of the veneer veneer with photocatalytic function prepared in Example 1;

It can be seen from Figure 2 that the bismuth molybdate crystals are grown on the wood structure, rather than simply attached to the wood surface.

Fig. 3 is the XRD pattern of the veneer veneer with photocatalytic function prepared in Example 1;

Diffraction peaks at 16.2° and 22.4° at 2θ correspond to wood. For the veneer veneer with photocatalytic function prepared in Example 1, the remaining diffraction peaks can be classified as pure koechilinite crystal phase, which is in accordance with reference (JCPDS76-2388).

Fig. 4 is an ultraviolet-visible absorption spectrum diagram, in Fig. 4, 1 is the ultraviolet-visible absorption spectrum curve of the photocatalyst powder obtained in step 4 of Example 1, and 2 is the ultraviolet-visible absorption spectrum curve of the veneer veneer with photocatalytic function obtained in step 4 of Example 1 Visible absorption spectrum curve;

It can be seen from FIG. 4 that the photocatalyst powder obtained in step 4 of Example 1 is a bismuth molybdate crystal. In the visible light range, curve 2 exhibits stronger absorption, indicating that it has photoactivity under visible light irradiation. It is indicated that the veneer veneer with photocatalytic function prepared in the present invention should have better photocatalytic potential than pure bismuth molybdate crystal in the visible light region. The band gap is estimated from the absorption edge.

The band gap value of the sample is further estimated according to the equation ahv=A(hv-Eg) ^n/2 , where a, h, n, Eg and A are the absorption coefficient, Planck constant, optical frequency, band gap and constant, respectively. Wherein, the n value is taken as 1, and the band gap of the bismuth molybdate crystal obtained in Example 1 and the veneer veneer with photocatalytic function are calculated according to this formula and the data in FIG. 4, and the band gap value of the bismuth molybdate crystal is 2.8 eV, the band gap value of the veneer veneer with photocatalytic function obtained in step 4 of Example 1 is 2.6 eV. The veneer veneer with photocatalytic function obtained in step 4 of Example 1 has a smaller band gap than the bismuth molybdate crystal. These results indicate that the veneer veneer with photocatalytic function obtained in step 4 of Example 1 has a band gap suitable for photocatalytic degradation of organic pollutants under visible light irradiation, so the veneer veneer with photocatalytic function obtained in step 4 of Example 1 has a photocatalytic function. The surface has good photocatalytic activity.

The veneer veneer with photocatalytic function obtained in step 4 of Example 1 was added to 30 mL of RhB dye solution with a concentration of 10 mol/L under light with a wavelength of 554 nm, and the degradation kinetic curve of the RhB dye solution was degraded for 0 min to 12 min. As shown in Figure 5;

Fig. 5 is a graph of degradation kinetics of the degradation of RhB dyes under illumination with a wavelength of 554 nm for different durations; 1 in Fig. 5 is a degradation kinetics curve of the photocatalyst powder obtained in step 4 of Example 1 to degrade RhB dyes, and 2 is an embodiment The degradation kinetics curve of RhB dye degradation of veneer veneer with photocatalytic function obtained in step 4.

In Fig. 5, C is the absorption of RhB at a wavelength of 554 nm during the photocatalytic process, and C ₀ is the absorption after adsorption equilibrium on the photocatalyst. It is clearly seen from Fig. 5 that after 12 minutes of irradiation, the photocatalyst The degradation rate of powder (bismuth molybdate crystal) is 10%, and the veneer veneer with photocatalytic function obtained in step 4 of Example 1 reaches 15%, which proves the veneer veneer with photocatalytic function obtained in step 4 of Example 1. The surface has better photocatalytic effect.

Claims (10)

1. a kind of preparation method of the veneer overlay with photo-catalysis function, it is characterised in that a kind of with the thin of photo-catalysis function What the preparation method of the wooden veneer was specifically realized by the following steps:

One, mixed solution A is prepared:

Five nitric hydrate bismuths are dissolved into nitric acid, mixed solution A is obtained；

The quality of the substance of five nitric hydrates bismuth described in step 1 and the volume ratio of nitric acid are (2mmol~4mmol): (30mL~50mL)；

The concentration of nitric acid described in step 1 is 3mol/L~5mol/L；

Two, mixed solution B is prepared；

Ammonium Molybdate Tetrahydrate is dissolved into distilled water, mixed solution B is obtained；

The quality of Ammonium Molybdate Tetrahydrate described in step 2 and the volume ratio of distilled water are (0.3g~0.8g): (30mL~ 40mL)；

Three, reaction solution is prepared:

Mixed solution B is added drop-wise in mixed solution A with 20 drops/min~40 drops/min rate of addition, obtains mixed solution C； The pH value of mixed solution C is adjusted to 3.5~4 using the ammonium hydroxide that mass fraction is 25%~28%, then low whipping speed is 2h~4h is stirred under 300r/min~500r/min, obtains reaction solution；

The volume ratio of mixed solution B and mixed solution A described in step 3 is (0.8~1.1): 1；

Four, hydro-thermal reaction:

Reaction solution is transferred in reaction kettle, then by timber pickling into reaction solution, then temperature be at 155 DEG C~170 DEG C it is anti- 14h~16h is answered, reaction product is obtained；Using deionized water to reaction product clean 3 times~5 times, then temperature be 50 DEG C~55 DEG C vacuum oven in dry 10h~14h, obtain the veneer overlay with photo-catalysis function and photocatalyst powder.

2. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step The quality of the substance of five nitric hydrate bismuths described in rapid one and the volume ratio of nitric acid are (2mmol~3mmol): (30mL~ 40mL)。

3. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step The quality of the substance of five nitric hydrate bismuths described in rapid one and the volume ratio of nitric acid are (3mmol~4mmol): (40mL~ 50mL)。

4. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step The concentration of nitric acid described in rapid one is 3mol/L~4mol/L.

5. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step The quality of Ammonium Molybdate Tetrahydrate described in rapid two and the volume ratio of distilled water are (0.3g~0.5g): (30mL~35mL).

6. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step The quality of Ammonium Molybdate Tetrahydrate described in rapid two and the volume ratio of distilled water are (0.5g~0.8g): (35mL~40mL).

7. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step The volume ratio of mixed solution B and mixed solution A described in rapid three is (0.9~1): 1.

8. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step Mixed solution B is added drop-wise in mixed solution A with 20 drops/min~30 drops/min rate of addition in rapid three, obtains mixed solution C；The pH value of mixed solution C is adjusted to 4 by the ammonium hydroxide for the use of mass fraction being 27%~28%, then low whipping speed is 300r/ 2h~3h is stirred under min~400r/min, obtains reaction solution.

9. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step Reaction solution is transferred in reaction kettle in rapid four, then by timber pickling into reaction solution, then in the case where temperature is 155 DEG C~160 DEG C 14h~15h is reacted, reaction product is obtained；Using deionized water to reaction product clean 3 times~4 times, then temperature be 50 DEG C~ Dry 10h~12h, obtains the veneer overlay with photo-catalysis function and photocatalyst powder in 53 DEG C of vacuum oven.

10. a kind of preparation method of veneer overlay with photo-catalysis function according to claim 1, it is characterised in that step Reaction solution is transferred in reaction kettle in rapid four, then by timber pickling into reaction solution, then in the case where temperature is 160 DEG C~165 DEG C 15h~16h is reacted, reaction product is obtained；Using deionized water to reaction product clean 4 times~5 times, then temperature be 53 DEG C~ Dry 12h~14h, obtains the veneer overlay with photo-catalysis function and photocatalyst powder in 55 DEG C of vacuum oven.