Preparation method and application of bacterial cellulose / bismuth molybdate composite photocatalytic material

Abstract

The invention discloses a preparation method of a bacterial cellulose / bismuth molybdate composite photocatalytic material, which comprises the following steps: firstly, carrying out alkali washing on in-situ growth bacterial cellulose, and freeze-drying for later use; shearing a certain amount of bacterial cellulose to prepare a bacterial cellulose suspension, and adding bismuth molybdate powder; carrying out ultrasonic full mixing, and carrying out vacuum filtration and hot pressing; and finally, preparing the bacterial cellulose / bismuth molybdate composite photocatalytic material. According to the invention, an in-situ growth and vacuum filtration method is adopted, so that the method is low in cost, green and pollution-free, and does not need high-temperature reaction; meanwhile, the bacterial cellulose / bismuth molybdate composite photocatalytic material is good in stability, can be recycled and has excellent photocatalytic performance, the degradation rate of rhodamine B can reach 70% or above within 150 min, and the degradation rate of the bacterial cellulose / bismuth molybdate composite photocatalytic material can still reach 50% or above after 5 times of experiments are cyclically repeated.

Description

Technical Field

[0001] The invention belongs to the field of photocatalytic material preparation and application, and specifically relates to a preparation method and application of a bacterial cellulose / bismuth molybdate composite photocatalytic material. Technical Background

[0002] Industrial and domestic wastewater contains a large number of organic pollutants that are difficult to biodegrade, such as methylene blue and reactive red. These pollutants have carcinogenic, teratogenic, mutagenic and other effects, which seriously affect human health and the ecological environment. However, unlike other organic pollutants (such as methylene blue, reactive red, etc.), traditional water treatment technologies are difficult to effectively remove these pollutants. In recent years, photocatalytic technology has developed rapidly. Photocatalysts have the advantages of low cost, high efficiency and sustainability. They are a promising technology for energy production and environmental remediation. At present, the research on photocatalytic technology mainly focuses on powder photocatalysts. However, these powder catalysts need to be separated from the water body in actual water treatment, which greatly limits the application of photocatalytic technology. Fixing the catalyst on a specific carrier can be an effective solution.

[0003] Bacterial cellulose (BC) is an extracellular polysaccharide produced by microbial fermentation. As a new type of environmentally friendly biomaterial, it has excellent mechanical strength, large specific surface area and three-dimensional interconnected porous structure. In the field of catalysts, BC can be used as an ideal template or catalyst carrier because it can provide both rapid mass transfer capacity and a large chemical reaction space. In addition, it will simplify the use, recovery and regeneration of catalysts.

[0004] Among various semiconductor photocatalysts, bismuth-based semiconductors are widely used due to their unique layered structure and good photocatalytic performance. Bi2MoO6 is a kind of [MoO4] 2- and

[0005] [Bi2O2] 2+ Photocatalysts composed of alternating layers, with band gap values ​​in the range of 2.5-2.8 eV, can not only capture visible light more efficiently, but also provide sufficient reaction sites to improve the photocatalytic performance. The rapid photoexcited electron-hole pair recombination, limited light-harvesting ability and low quantum yield of photocatalysts have hindered the development of photocatalysts. Therefore, it is imperative to further explore how to expand the visible light response range of Bi2MoO6 and thus improve its photocatalytic activity. Summary of the invention

[0006] In view of the deficiencies of the prior art, the present invention provides a bacterial cellulose / bismuth molybdate composite photocatalytic material and its preparation method and application. In the bacterial cellulose / bismuth molybdate composite photocatalytic material of the present invention, bismuth molybdate is used as a functional material, bacterial cellulose is used as a supporting carrier of the composite photocatalytic material, and the bismuth molybdate is evenly dispersed on the bacterial cellulose nanofibers by an in-situ growth and vacuum filtration method. The synthesis method is low-cost, green and pollution-free, does not require high-temperature reaction, and the prepared composite material has good stability, can be recycled, and has excellent photocatalytic performance.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is: a method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material, comprising the following steps:

[0008] (1) dissolving mannitol, tryptone and yeast extract powder in an appropriate amount of deionized water to prepare a uniform nutrient solution, and sterilizing at 120-125° C. for 15-30 min; inoculating 0.1-4.8 mL of bacterial cellulose strains into 0.1-200 mL of the prepared culture solution, and placing the solution in a biological incubator at 30° C. under static conditions for 3-7 days to obtain a bacterial cellulose film;

[0009] (2) filtering the bacterial cellulose membrane prepared in step (1) from the culture medium, placing it in a 0.1-0.2 M NaOH solution for alkaline washing for 2-6 hours, then rinsing it with deionized water for multiple times until the bacterial cellulose membrane is neutral, and freeze-drying it for later use;

[0010] (3) taking 80-120 mg of the freeze-dried bacterial cellulose membrane in step (2) and dissolving it in 40-60 mL of deionized water, placing it in a homogenizer for shearing at a shear rate of 500-800 r / min to obtain a bacterial cellulose membrane suspension;

[0011] (4) Add 100-400 mg of bismuth molybdate powder to the bacterial cellulose membrane suspension obtained in step (3), mix thoroughly under ultrasound, vacuum filter and hot press to obtain a bacterial cellulose / bismuth molybdate composite photocatalytic material.

[0012] In step (1), the mass concentration of mannitol is 0-30 g / L, the mass concentration of tryptone is 0-6 g / L, and the mass concentration of yeast extract is 0-5 g / L.

[0013] In step (1), the bacterial cellulose strain is a bacterial cellulose-producing strain of the genus Xylose.

[0014] In step (2), the temperature of the NaOH solution alkaline washing is 20-80°C.

[0015] In step (2), the freeze-drying time is 12-24 hours and the temperature is -75-0°C.

[0016] In step (4), the bismuth molybdate powder is synthesized by a solvent thermal method: first, 0.004M bismuth nitrate pentahydrate Bi(NO3)3·5H2O and 0.002M sodium molybdate Na2MoO4·2H2O are weighed and dissolved in 6mL of ethylene glycol respectively, and then the bismuth nitrate alcohol solution and the sodium molybdate alcohol solution are fully mixed, and 50mL of ethanol is added after mixing; after stirring evenly, the mixture is transferred to a 100mL polytetrafluoroethylene reactor, and reacted at 160°C for 20h to obtain a Bi2MoO6 photocatalytic material.

[0017] In step (4), the ultrasonic time is 20-30 minutes, the hot pressing temperature is 25-30°C, and the hot pressing time is 12-24 hours.

[0018] Application of the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared by the bacterial cellulose / bismuth molybdate composite photocatalytic material preparation method in catalytic degradation of organic matter.

[0019] Beneficial effects of the present invention: The present invention successfully prepares bacterial cellulose / bismuth molybdate composite photocatalytic materials on the surface of bacterial cellulose by in-situ growth and vacuum filtration methods. Compared with the prior art, the method of the present invention is simple to operate, low in cost, green and pollution-free, and does not require high-temperature reaction. The present invention utilizes the three-dimensional network structure of bacterial cellulose, and uses cross-linking hot pressing to adhere bismuth molybdate nanoparticles to bacterial cellulose, so that the bacterial cellulose and bismuth molybdate are well combined. At the same time, bacterial cellulose has a certain adsorption capacity, and can also accelerate the transfer rate of photogenerated electrons, thereby inhibiting the recombination of photogenerated electron-hole pairs, further enhancing the photocatalytic activity and photocatalytic degradation performance of the bacterial cellulose / bismuth molybdate composite photocatalytic material, especially the degradation rate of rhodamine B can be degraded by more than 70% within 150 minutes, and the degradation rate can still reach more than 50% after repeating the experiment 5 times.

[0020] Furthermore, the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared by the present invention has uniform morphology, good continuity, is green and pollution-free, and is flexible. The overall macroscopic appearance is a thin film, which is easier to recycle and reuse than powder materials, and can effectively reduce costs and improve economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The SEM electron microscope photographs of bacterial cellulose, bismuth molybdate powder and bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 1 are shown; wherein, Figure 1 a is the SEM image of bacterial cellulose, showing an interwoven 3D nanofiber structure with a fiber diameter of about 500 nm; Figure 1b is a SEM image of bismuth molybdate powder photocatalytic material, from which it can be seen that the bismuth molybdate photocatalytic material is composed of 2μm microspheres, which are formed by tiny nanosheets. These nanosheets are crossed and aggregated, so that the microspheres have a high specific surface area; Figure 1 c is the SEM image of the prepared bacterial cellulose / bismuth molybdate composite photocatalytic material, where bismuth molybdate nanoparticles are combined with bacterial cellulose fibers, which have both fiber morphology and the "flower-like" structure of the catalyst;

[0022] Figure 2 is the FTIR graph of the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 1;

[0023] Figure 3 is the XRD spectrum of the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 1;

[0024] Figure 4 is the photocatalytic degradation curve of rhodamine B by the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 1-4 under visible light irradiation;

[0025] Figure 5 This is a performance diagram of the catalytic degradation cycle of rhodamine B by the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 2 under visible light irradiation;

[0026] Figure 6 This is the XRD diagram of the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 2 before and after being used for 5 times in a cycle. DETAILED DESCRIPTION

[0027] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0028] Example 1

[0029] A method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material comprises the following steps:

[0030] (1) 25 g of mannitol, 5 g of tryptone and 3 g of yeast extract powder were dissolved in 1 L of deionized water to prepare a nutrient solution, and the prepared nutrient solution was sterilized at 121° C. for 30 min; 4.6 mL of bacterial cellulose was placed in 100 mL of culture solution under static conditions at 30° C. and statically cultured in a biological incubator for 7 days to obtain a bacterial cellulose nanofiber membrane;

[0031] (2) The bacterial cellulose nanofiber membrane prepared in step (1) was filtered out from the culture medium, placed in a 0.2 M NaOH solution at 80°C for 6 h to remove cell residues and contaminants, then rinsed with deionized water several times until the bacterial cellulose nanofiber membrane was neutral, and freeze-dried at -70°C for 24 h for later use.

[0032] (3) taking 100 mg of the freeze-dried bacterial cellulose membrane in step (2) and dissolving it in 50 mL of deionized water, placing it in a homogenizer for shearing at a shear rate of 800 r / min to obtain a bacterial cellulose membrane suspension;

[0033] (4) Add 100 mg of bismuth molybdate powder to the bacterial cellulose membrane suspension obtained in step (3), mix thoroughly by ultrasonication for 30 min, perform vacuum filtration, and hot press at 30° C. for 24 h to obtain a bacterial cellulose / bismuth molybdate composite photocatalytic material.

[0034] The bismuth molybdate powder in step (4) is prepared by a solvent thermal synthesis method: first, 0.004M bismuth nitrate pentahydrate Bi(NO3)3·5H2O and 0.002M sodium molybdate Na2MoO4·2H2O are weighed and dissolved in 6mL of ethylene glycol respectively, and then the bismuth nitrate alcohol solution and the sodium molybdate alcohol solution are fully mixed, and 50mL of ethanol is added after mixing; after stirring evenly, the mixture is transferred to a 100mL polytetrafluoroethylene reactor, and reacted at 160°C for 20h to obtain a Bi2MoO6 photocatalytic material.

[0035] The microstructure and structure of the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared by the above method were observed by SEM. Figure 1 a is the SEM image of bacterial cellulose, showing an interwoven 3D nanofiber structure with a fiber diameter of about 500 nm; Figure 1 b is a SEM image of bismuth molybdate photocatalyst material, which shows that the bismuth molybdate photocatalyst material is composed of 2μm microspheres, which are formed by tiny nanosheets. These nanosheets are crossed and aggregated, so that the microspheres have a high specific surface area; Figure 1 c is the SEM image of bacterial cellulose / bismuth molybdate composite photocatalytic material. It can be seen that bismuth molybdate nanoparticles are combined with bacterial cellulose fibers, with both fiber morphology and catalyst "flower-like" structure, indicating that the prepared photocatalytic composite material has excellent stability. Infrared spectroscopy and ultraviolet X-ray diffraction were used to analyze the chemical functional group composition and crystal structure of bacterial cellulose / bismuth molybdate composite fiber membrane, such as Figure 2 and Figure 3 shown.

[0036] Example 2

[0037] A method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material comprises the following steps:

[0038] (1) 25 g of mannitol, 5 g of tryptone and 3 g of yeast extract were dissolved in 1 L of water to prepare a nutrient solution, and the prepared nutrient solution was sterilized at 121° C. for 30 min; 4.6 mL of bacterial cellulose was placed in 200 mL of culture solution under static conditions at 30° C. and statically cultured in a biological incubator for 7 days to obtain a bacterial cellulose nanofiber membrane;

[0039] (2) filtering the bacterial cellulose nanofiber membrane prepared in step (1) from the culture medium, placing it in a 0.2 M NaOH solution at 80° C. for 6 h to remove cell residues and contaminants, then rinsing it with deionized water several times until the bacterial cellulose nanofiber membrane is neutral, and freeze-drying it at -70° C. for 24 h for later use;

[0040] (3) taking 100 mg of the freeze-dried bacterial cellulose membrane in step (2) and dissolving it in 50 mL of deionized water, placing it in a homogenizer for shearing at a shear rate of 800 r / min to obtain a bacterial cellulose membrane suspension;

[0041] (4) Add 200 mg of bismuth molybdate powder to the bacterial cellulose membrane suspension obtained in step (3), mix thoroughly by ultrasonication for 30 min, perform vacuum filtration, and hot press at 30° C. for 24 h to obtain a bacterial cellulose / bismuth molybdate composite photocatalytic material.

[0042] The bismuth molybdate powder in step (4) is prepared by a solvent thermal synthesis method: first, 0.004M bismuth nitrate pentahydrate Bi(NO3)3·5H2O and 0.002M sodium molybdate Na2MoO4·2H2O are weighed and dissolved in 6mL of ethylene glycol respectively, and then the bismuth nitrate alcohol solution and the sodium molybdate alcohol solution are fully mixed, and 50mL of ethanol is added after mixing; after stirring evenly, the mixture is transferred to a 100mL polytetrafluoroethylene reactor, and reacted at 160°C for 20h to obtain a Bi2MoO6 photocatalytic material.

[0043] The microscopic morphology and structure were observed by SEM, and the chemical functional group composition and crystal structure of the bacterial cellulose / bismuth molybdate composite fiber membrane were analyzed by infrared spectroscopy and ultraviolet X-ray diffraction; the results were similar to those in Example 1.

[0044] Example 3

[0045] A method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material comprises the following steps:

[0046] (1) 25 g of mannitol, 5 g of tryptone and 3 g of yeast extract were dissolved in 1 L of water to prepare a nutrient solution, and the prepared nutrient solution was sterilized at 121° C. for 30 min; 4.6 mL of bacterial cellulose was placed in 200 mL of culture solution under static conditions at 30° C. and statically cultured in a biological incubator for 7 days to obtain a bacterial cellulose nanofiber membrane;

[0047] (2) filtering the bacterial cellulose nanofiber membrane prepared in step (1) from the culture medium, placing it in a 0.2 M NaOH solution at 80° C. for 6 h to remove cell residues and contaminants, then rinsing it with deionized water several times until the bacterial cellulose nanofiber membrane is neutral, and freeze-drying it at -70° C. for 24 h for later use;

[0048] (3) taking 100 mg of the freeze-dried bacterial cellulose membrane in step (2) and dissolving it in 50 mL of deionized water, placing it in a homogenizer for shearing at a shear rate of 800 r / min to obtain a bacterial cellulose membrane suspension;

[0049] (4) Add 300 mg of bismuth molybdate powder to the bacterial cellulose membrane suspension obtained in step (3), mix thoroughly by ultrasonication for 30 min, perform vacuum filtration, and hot press at 30° C. for 24 h to obtain a bacterial cellulose / bismuth molybdate composite photocatalytic material.

[0050] The bismuth molybdate powder in step (4) is prepared by a solvent thermal synthesis method: first, 0.004M bismuth nitrate pentahydrate Bi(NO3)3·5H2O and 0.002M sodium molybdate Na2MoO4·2H2O are weighed and dissolved in 6mL of ethylene glycol respectively, and then the bismuth nitrate alcohol solution and the sodium molybdate alcohol solution are fully mixed, and 50mL of ethanol is added after mixing; after stirring evenly, the mixture is transferred to a 100mL polytetrafluoroethylene reactor, and reacted at 160°C for 20h to obtain a Bi2MoO6 photocatalytic material.

[0051] The microscopic morphology and structure were observed by SEM, and the chemical functional group composition and crystal structure of the bacterial cellulose / bismuth molybdate composite fiber membrane were analyzed by infrared spectroscopy and ultraviolet X-ray diffraction; the results were similar to those in Example 1.

[0052] Example 4

[0053] A method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material comprises the following steps:

[0054] (1) 25 g of mannitol, 5 g of tryptone and 3 g of yeast extract were dissolved in 1 L of water to prepare a nutrient solution, and the prepared nutrient solution was sterilized at 121° C. for 30 min; 4.6 mL of bacterial cellulose was placed in 200 mL of culture solution under static conditions at 30° C. and statically cultured in a biological incubator for 7 days to obtain a bacterial cellulose nanofiber membrane;

[0055] (2) filtering the bacterial cellulose nanofiber membrane prepared in step (1) from the culture medium, placing it in a 0.2 M NaOH solution at 80° C. for 6 h to remove cell residues and contaminants, then rinsing it with deionized water several times until the bacterial cellulose nanofiber membrane is neutral, and freeze-drying it at -70° C. for 24 h for later use;

[0056] (3) taking 100 mg of the freeze-dried bacterial cellulose membrane in step (2) and dissolving it in 50 mL of deionized water, placing it in a homogenizer for shearing at a shear rate of 800 r / min to obtain a bacterial cellulose membrane suspension;

[0057] (4) Add 400 mg of bismuth molybdate powder to the bacterial cellulose membrane suspension obtained in step (3), mix thoroughly by ultrasonication for 30 min, perform vacuum filtration, and hot press at 30° C. for 24 h to obtain a bacterial cellulose / bismuth molybdate composite photocatalytic material.

[0058] The bismuth molybdate powder in step (4) is prepared by a solvent thermal synthesis method: first, 0.004M bismuth nitrate pentahydrate Bi(NO3)3·5H2O and 0.002M sodium molybdate Na2MoO4·2H2O are weighed and dissolved in 6mL of ethylene glycol respectively, and then the bismuth nitrate alcohol solution and the sodium molybdate alcohol solution are fully mixed, and 50mL of ethanol is added after mixing; after stirring evenly, the mixture is transferred to a 100mL polytetrafluoroethylene reactor, and reacted at 160°C for 20h to obtain a Bi2MoO6 photocatalytic material.

[0059] The microscopic morphology and structure were observed by SEM, and the chemical functional group composition and crystal structure of the bacterial cellulose / bismuth molybdate composite fiber membrane were analyzed by infrared spectroscopy and ultraviolet X-ray diffraction; the results were similar to those in Example 1.

[0060] Application Examples

[0061] The bacterial cellulose / bismuth molybdate composite photocatalytic materials prepared in Examples 1-4 and a separate bacterial cellulose film suspension were subjected to a photocatalytic degradation experiment of Rhodamine B, and the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 2 was subjected to a photocatalytic degradation stability experiment of Rhodamine B.

[0062] The bacterial cellulose / bismuth molybdate composite photocatalytic materials prepared in Examples 1-4 and a separate bacterial cellulose film suspension were applied to the photocatalytic degradation experiment of rhodamine B. The simulated light source used was a 300W xenon lamp, and the concentration of the rhodamine B solution was 25 mg / L. The specific steps were as follows:

[0063] The bacterial cellulose / bismuth molybdate composite photocatalytic material prepared by 2cm×2cm 1-4 and the 2cm×2cm membrane prepared by the bacterial cellulose membrane suspension were added to 50mL of 25mg / L rhodamine B solution, and the xenon lamp simulating sunlight was turned on to illuminate each solution. 4mL of the solution was taken every 30min, centrifuged at 8000rpm for 5min, and the supernatant was taken and the absorbance was tested by UV-3600 spectrophotometer at a detection wavelength of 550nm. Figure 4 It can be seen that the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Examples 1-4 has better photocatalytic degradation effect on Rhodamine B than the bacterial cellulose film suspension alone; Figure 5 After the bacterial cellulose / bismuth molybdate composite photocatalytic material prepared in Example 2 was repeated 5 times, it showed good stability in catalytic degradation of rhodamine B under visible light irradiation.

[0064] The experiment was repeated 5 times. After the reaction was completed, the composite photocatalytic material prepared in Example 2 was recovered and XRD detection was performed. It can be seen that the XRD spectrum thereof remained consistent, as shown in FIG. Figure 6 .

Claims

1. A method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material, characterized in that: The following steps are involved: (1) dissolving mannitol, tryptone and yeast extract powder in an appropriate amount of deionized water to prepare a uniform nutrient solution, and sterilizing at 120-125° C. for 15-30 min; inoculating 0.1-4.8 mL of bacterial cellulose strains into 0.1-200 mL of the prepared culture solution, and placing the solution in a biological incubator at 30° C. under static conditions for 3-7 days to obtain a bacterial cellulose film; (2) filtering the bacterial cellulose membrane prepared in step (1) from the culture medium, placing it in a 0.1-0.2 M NaOH solution for alkaline washing for 2-6 hours, then rinsing it with deionized water for multiple times until the bacterial cellulose membrane is neutral, and freeze-drying it for later use; (3) taking 80-120 mg of the freeze-dried bacterial cellulose membrane in step (2) and dissolving it in 40-60 mL of deionized water, placing it in a homogenizer for shearing at a shear rate of 500-800 r / min to obtain a bacterial cellulose membrane suspension; (4) Add 100-400 mg of bismuth molybdate powder to the bacterial cellulose membrane suspension obtained in step (3), mix thoroughly under ultrasound, vacuum filter and hot press to obtain a bacterial cellulose / bismuth molybdate composite photocatalytic material.

2. The method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material according to claim 1, characterized in that: In step (1), the mass concentration of mannitol is 0-30 g / L, the mass concentration of tryptone is 0-6 g / L, and the mass concentration of yeast extract is 0-5 g / L.

3. The method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material according to claim 1, characterized in that: In step (1), the bacterial cellulose strain is a bacterial cellulose-producing strain of the genus Xylose.

4. The method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material according to claim 1, characterized in that: In step (2), the temperature of the NaOH solution alkaline washing is 20-80°C.

5. The method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material according to claim 1, characterized in that: In step (2), the freeze-drying time is 12-24 hours and the temperature is -75-0°C.

6. The method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material according to claim 1, characterized in that: In step (4), the bismuth molybdate powder is synthesized by a solvent thermal method: first, 0.004M bismuth nitrate pentahydrate Bi(NO3)3·5H2O and 0.002M sodium molybdate Na2MoO4·2H2O are weighed and dissolved in 6mL of ethylene glycol respectively, and then the bismuth nitrate alcohol solution and the sodium molybdate alcohol solution are fully mixed, and 50mL of ethanol is added after mixing; after stirring evenly, the mixture is transferred to a 100mL polytetrafluoroethylene reactor, and reacted at 160°C for 20h to obtain a Bi2MoO6 photocatalytic material.

7. The method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material according to claim 1, characterized in that: In step (4), the ultrasonic time is 20-30 minutes, the hot pressing temperature is 25-30°C, and the hot pressing time is 12-24 hours.

8. A bacterial cellulose / bismuth molybdate composite photocatalytic material prepared by the method for preparing a bacterial cellulose / bismuth molybdate composite photocatalytic material as claimed in any one of claims 1 to 7.

9. Use of the bacterial cellulose / bismuth molybdate composite photocatalytic material according to claim 8 in catalytic degradation of organic matter.

Images