A preparation method of a bismuth vanadate / aluminum oxide foam ceramic composite photocatalytic material

Abstract

The application discloses a preparation method of a bismuth vanadate / alumina foam ceramic composite photocatalytic material, and comprises the following steps: S1, washing a substrate material, and then pretreating the substrate material to obtain a pretreated substrate; S2, mixing water, ethanol and ethylene glycol to obtain a mixed solution A for standby; S3, dissolving soluble vanadium salt, soluble bismuth salt and a doped element in the mixed solution A, and continuously stirring until the soluble vanadium salt, the soluble bismuth salt and the doped element are dissolved to obtain a mixed solution B; S4, repeatedly immersing the pretreated substrate in the mixed solution B, and sufficiently drying the pretreated substrate after the immersion to obtain an immersed substrate material; and S5, sintering the immersed substrate material in a sintering device, and then taking out the immersed substrate material after the immersed substrate material is naturally cooled to room temperature to obtain the bismuth vanadate / alumina foam ceramic composite photocatalytic material. The process flow of the application is simple, raw materials used are simple and easy to obtain, the operation difficulty of a preparation process is moderate, controllability is good, synthesis conditions are easy to control, and the application has strong operability and practicability.

Description

Technical Field

[0001] This invention belongs to the field of photocatalysis technology, and specifically relates to a method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material. Background Technology

[0002] With the increasing severity of global environmental pollution, photocatalysis using semiconductors has become popular since the 1970s. This technology is considered a promising purification method that can utilize sunlight without secondary pollution. Photocatalysts are key to this technology. Initially, researchers extensively studied the photodegradation of organic matter using nano-titanium dioxide. However, due to its wide band gap (3.2 eV), it only reacts under ultraviolet light. Subsequently, research focus gradually shifted to bismuth-based ternary oxides with narrower band gaps. Bismuth vanadate materials have high absorption capacity in the visible light range, exhibiting significant and stable pollutant degradation effects, and are harmless and non-toxic. They can effectively utilize visible light to photolyze water and organic matter. Furthermore, they are relatively common and easy to synthesize, with low preparation costs and wide applicability, making them a focal point in the field of visible light photocatalysts.

[0003] Since then, bismuth vanadate photocatalysts have been widely studied in the field of environmental pollution control. Currently, it is known that bismuth vanadate photocatalysts are present in powder form in some studies, exhibiting poor stability. This leads to material loss during recycling, increasing the cost of the photocatalyst and causing secondary pollution from the unrecovered powder. Therefore, finding a suitable catalyst loading technology has become a research hotspot for scientists.

[0004] Meanwhile, the ability to reuse materials multiple times efficiently has always been an important issue, as it greatly affects the cost-effectiveness of the material in actual use. The material prepared by this patented method not only solves the problem of the difficulty in recycling powdered photocatalytic materials, but also improves the catalytic activity and selectivity by changing the surface composition of the material through doping, thus preparing a material with good reusability and photocatalytic effect. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing photocatalysts, such as difficulty in recycling and poor stability, by providing a method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalyst. This invention involves continuously screening and selecting suitable solvents to prepare solutions, thereby better solidifying and loading the photocatalyst onto a suitable support, resulting in a more secure load that is less prone to falling off. Simultaneously, by modifying the loading of the powdered photocatalyst, the photocatalyst and substrate become integrated, solving the difficulties of recycling and reusability of existing photocatalyst materials. Finally, by further modifying the photocatalyst material through element doping, a higher-performance photocatalyst material is prepared, improving its photocatalytic performance and the number of times it can be reused.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material includes the following steps:

[0008] S1: The substrate material is cleaned and then pretreated to obtain a pretreated substrate;

[0009] S2: Mix water, ethanol and ethylene glycol to obtain mixed solution A for later use;

[0010] S3: Dissolve the soluble vanadium salt, soluble bismuth salt and dopant element in the mixed solution A obtained in step S2, and continue stirring until dissolved to obtain mixed solution B;

[0011] S4: The pretreated substrate obtained in step S1 is repeatedly impregnated in the mixed solution B obtained in step S3, and then thoroughly dried to obtain the impregnated substrate material;

[0012] S5: The impregnated substrate material obtained in step S4 is placed in a sintering apparatus for sintering, and then removed after natural cooling to room temperature to obtain a bismuth vanadate / alumina foam ceramic composite photocatalytic material.

[0013] As a further explanation of the present invention, in step S1, the substrate material is a foam ceramic material. Preferred foam ceramic materials include silicon carbide foam ceramics, alumina foam ceramics, and silicon nitride foam ceramics.

[0014] As a further explanation of the present invention, in step S1, the shape of the substrate material is spherical, columnar, or tubular, and the porosity of the substrate material is 20ppi, 30ppi, 40ppi, or 50ppi.

[0015] As a further explanation of the present invention, in step S1, the pretreatment is as follows: first, the substrate material is soaked in an acidic solution and an organic solution for 5-60 minutes respectively, then the substrate material is soaked in deionized water and ultrasonically cleaned for 5-60 minutes, and finally dried to obtain a pretreated substrate for later use.

[0016] As a further explanation of the present invention, in step S2, the ethylene glycol concentration in the mixed solution A is not less than 60%.

[0017] As a further explanation of the present invention, in step S3, the soluble vanadium salt is one or more of vanadium pentoxide, ammonium metavanadate, or sodium metavanadate (any mixing ratio, which can be adjusted according to actual needs); the soluble bismuth salt is one or more of bismuth nitrate, bismuth hydroxide, or bismuth acetate (any mixing ratio, which can be adjusted according to actual needs); and the doping element is one or more of ammonium molybdate hydrate, ammonium tungstate, sodium tungstate, sodium acetate, or copper nitrate (any mixing ratio, which can be adjusted according to actual needs).

[0018] As a further explanation of the present invention, in step S3, the mixing ratio of soluble vanadium salt, soluble bismuth salt and mixed solution A in the mixed solution B is: soluble vanadium salt: soluble bismuth salt: mixed solution A = 1 mmol: 1 mmol: 20 ml.

[0019] As a further explanation of the present invention, in step S4, the repeated impregnation means that after the previous impregnation, the pretreated substrate is dried before the next impregnation is performed.

[0020] As a further explanation of the present invention, in step 5, the sintering device is a muffle furnace or a tube furnace, and the sintering parameters are: the sintering temperature is 400-600℃, the sintering heating rate is 5-30℃ / min, and the sintering holding time is 10-240min.

[0021] The application of the bismuth vanadate / alumina foam ceramic composite photocatalyst material prepared by the present invention is to use the bismuth vanadate / alumina foam ceramic composite photocatalyst material prepared by the above method to degrade dissolved pollutants in water, including but not limited to antibiotics, pesticides, dyes, etc.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. The process of this invention is simple, the raw materials used are readily available, the preparation process is of moderate difficulty, has good controllability, and the synthesis conditions are easy to control, making it highly operable and practical.

[0024] 2. In the method of the present invention, the substrate material is first pretreated. In the pretreatment, inorganic and organic solutions are used for cleaning to ensure that organic and inorganic contaminants on the substrate material can be cleaned more effectively, thereby improving its load cleanliness. At the same time, the substrate material can be replaced and its size can be freely selected, which determines that the material has a wide range of applications.

[0025] 3. The mixed solution A used for dissolution in the method of the present invention is a mixture of water, ethanol and ethylene glycol. The colorless and transparent viscous liquid ethylene glycol, due to its unique physicochemical properties, allows the solution to adhere better to the substrate material during the impregnation stage. The sintered composite photocatalytic material is more firmly attached and less likely to fall off, greatly improving its reusability. At the same time, adding water and ethanol in a certain proportion can better save raw materials and is more economical.

[0026] 4. The bismuth vanadate / alumina foam ceramic composite photocatalytic material prepared by this invention, according to relevant experimental results, shows that the photocatalyst is uniformly loaded on the support, and the element doping can be clearly observed through characterization. At the same time, photocatalytic testing shows that the element doping greatly improves the photocatalytic performance of the bismuth vanadate photocatalytic material.

[0027] 5. The bismuth vanadate / alumina foam ceramic composite photocatalytic material prepared by this invention was subjected to a series of experiments to test its reusability. Through continuous use, the experiments showed that the material can be reused many times and has good stability. At the same time, through certain regeneration methods, its photocatalytic performance can be restored to a certain extent, which greatly improves the usability of the material.

[0028] 6. The application of the bismuth vanadate / alumina foam ceramic composite photocatalytic material of the present invention: the material can be used as a photocatalytic material to degrade pollutants in water and achieve a certain degradation effect within a certain period of time, which has broad application prospects. In this laboratory, a workbench was built to simulate the working environment of the material in water. By utilizing the buoyancy of other materials, the photocatalytic material can be naturally suspended on the water, providing an experimental method for the material to be deployed. Attached Figure Description

[0029] Figure 1 This is a physical image of the bismuth vanadate / alumina foam ceramic photocatalytic material prepared in Example 1 of the present invention.

[0030] Figure 2 a and b are scanning electron microscope images of the bismuth vanadate / alumina foam ceramic photocatalytic material prepared in Example 1 of this invention.

[0031] Figure 3The image shows the X-ray diffraction pattern of the bismuth vanadate / alumina foam ceramic photocatalytic material prepared in Example 1 of this invention.

[0032] Figure 4 The image shows the effect of repeated photocatalytic degradation of the bismuth vanadate / alumina foam ceramic photocatalytic material prepared in Example 1 of this invention.

[0033] Figure 5 The image shows the effect of repeated photocatalytic degradation of the bismuth vanadate / alumina foam ceramic photocatalytic material prepared in Example 2 of this invention. Detailed Implementation

[0034] The invention will be further described below with reference to the accompanying drawings. Example

[0035] A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material includes the following steps:

[0036] S1: The substrate material, alumina foam ceramic, is first soaked in 10% hydrochloric acid solution for 1 hour, then rinsed with deionized water, then soaked in acetone solution for 1 hour, and then ultrasonically cleaned with deionized water in a water bath ultrasonic cleaner for 20 minutes. Finally, it is dried in an electric heating drying oven to obtain the pretreated substrate.

[0037] S2: Mix water, ethanol and ethylene glycol in a ratio of 2:2:6 to obtain 100ml of mixed solution A for later use;

[0038] S3: Dissolve soluble vanadium salt (NH4VO3): soluble bismuth salt (Bi(NO3)3·5H2O): dopant element in a ratio of 0.6g:2.5g:0g in mixed solution A obtained in S2, and continue stirring until dissolved to obtain mixed solution B;

[0039] S4: Immerse the pretreated substrate obtained in S1 in the mixed solution B obtained in S3 twice, for 30 minutes each time, and dry it thoroughly after removal;

[0040] S5: The material obtained in S4 is placed in a muffle furnace and calcined at 500℃ (heating rate of 10℃ / min) for 60 min. After naturally cooling to room temperature, it is removed to obtain a bismuth vanadate / alumina foam ceramic composite photocatalytic material, such as... Figure 1 As shown.

[0041] from Figure 2 The scanning electron microscope (SEM) images shown in a and b reveal that the bismuth vanadate sample exhibits a smooth, irregular, worm-like nanoarray structure with granular morphology, uniformly deposited on the foam ceramic.

[0042] from Figure 3The X-ray powder diffraction (XRD) pattern shown shows that the XRD pattern of BiVO4 is consistent with the standard diffraction pattern of JCPDS card number 14-0688, indicating that BiVO4 exists in the monoclinic phase.

[0043] To test the repeatability of the material, continuous uninterrupted light irradiation was used. A certain concentration of pollutant was subjected to light irradiation, with each irradiation lasting 120 minutes. Afterward, a fresh pollutant solution was used to continue the degradation experiment. After 90 cycles of continuous degradation, the material was... Figure 4 The degradation effect diagram shown indicates that its degradation effect has not decreased significantly, proving that it has good reusability. Example

[0044] A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material includes the following steps:

[0045] S1: The substrate material, alumina foam ceramic, is first soaked in 10% hydrochloric acid solution for 1 hour, then rinsed with deionized water, then soaked in acetone solution for 1 hour, and then ultrasonically cleaned with deionized water in a water bath ultrasonic cleaner for 20 minutes. Finally, it is placed in an electric heating drying oven to dry, and the pretreated substrate is obtained.

[0046] S2: Mix water, ethanol and ethylene glycol in a ratio of 2:2:6 to obtain 100ml of mixed solution A for later use;

[0047] S3: Soluble vanadium salt (NH4VO3): Soluble bismuth salt (Bi(NO3)3·5H2O): Dopant element (0.035g(NH4)6Mo7O) 24 ·4H₂O + 0.045g (NH₄) 10 H2(W2O7)6 was dissolved in S2 at a ratio of 0.6g:2.5g:0.08g to obtain mixed solution A, and stirred continuously until dissolved to obtain mixed solution B;

[0048] S4: Immerse the pretreated substrate obtained in S1 in the mixed solution B obtained in S3 twice, for 30 minutes each time, and dry it thoroughly after removal;

[0049] S5: The material obtained in S4 is placed in a muffle furnace and calcined at 500℃ (heating rate of 10℃ / min) for 60 min. After it is naturally cooled to room temperature, it is taken out to obtain a sustainable bismuth vanadate / alumina foam ceramic composite photocatalytic material.

[0050] Example 2 was modified and doped compared to Example 1.

[0051] The same experimental procedure as in Example 1 was used to conduct 90 uninterrupted photocatalytic experiments on the material, from... Figure 5As can be seen from the degradation effect diagram, the photocatalytic effect of Example 2 is improved compared with Example 1, proving that element doping can effectively improve the photocatalytic efficiency of the material. At the same time, the photocatalytic degradation rate has never been lower than 85%, which further proves that the material has good stability. Example

[0052] A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material includes the following steps:

[0053] S1: The substrate material, silicon carbide foam ceramic, is cleaned and then pretreated to obtain a pretreated substrate;

[0054] S2: Mix water, ethanol and ethylene glycol to obtain mixed solution A for later use;

[0055] S3: Dissolve the soluble vanadium salt, soluble bismuth salt and dopant element in the mixed solution A obtained in step S2, and continue stirring until dissolved to obtain mixed solution B;

[0056] S4: The pretreated substrate obtained in step S1 is repeatedly impregnated in the mixed solution B obtained in step S3, and then thoroughly dried to obtain the impregnated substrate material;

[0057] S5: The impregnated substrate material obtained in step S4 is placed in a sintering apparatus for sintering, and then removed after natural cooling to room temperature to obtain a bismuth vanadate / alumina foam ceramic composite photocatalytic material.

[0058] As a further illustration of this embodiment, in step S1, the substrate material is aluminum oxide. The substrate material is spherical in shape, and the porosity of the substrate material is 20 ppi.

[0059] As a further explanation of this embodiment, in step S1, the pretreatment is as follows: first, the substrate material is soaked in an acidic solution and an organic solution for 30 minutes respectively, then the substrate material is soaked in deionized water and ultrasonically cleaned for 5 minutes, and finally dried to obtain a pretreated substrate for later use.

[0060] As a further illustration of this embodiment, in step S2, the ethylene glycol concentration in the mixed solution A is 70%.

[0061] As a further illustration of this embodiment, in step S3, the soluble vanadium salt is vanadium pentoxide; the soluble bismuth salt is bismuth nitrate; and the doping element is ammonium molybdate hydrate.

[0062] As a further illustration of this embodiment, in step S3, the mixing ratio of soluble vanadium salt, soluble bismuth salt and mixed solution A in the mixed solution B is: soluble vanadium salt: soluble bismuth salt: mixed solution A = 1 mmol: 1 mmol: 20 ml.

[0063] As a further explanation of this embodiment, in step S4, the repeated impregnation means that after the previous impregnation, the pretreated substrate is dried before the next impregnation is performed.

[0064] As a further illustration of this embodiment, in step 5, the sintering device is a muffle furnace, and the sintering parameters are: the sintering temperature is 400℃, the heating rate of the sintering process is 5℃ / min, and the holding time of the sintering process is 240min. Example

[0065] A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material includes the following steps:

[0066] S1: The silicon nitride foam ceramic substrate material is cleaned and then pretreated to obtain a pretreated substrate;

[0067] S2: Mix water, ethanol and ethylene glycol to obtain mixed solution A for later use;

[0068] S3: Dissolve the soluble vanadium salt, soluble bismuth salt and dopant element in the mixed solution A obtained in step S2, and continue stirring until dissolved to obtain mixed solution B;

[0069] S4: The pretreated substrate obtained in step S1 is repeatedly impregnated in the mixed solution B obtained in step S3, and then thoroughly dried to obtain the impregnated substrate material;

[0070] S5: The impregnated substrate material obtained in step S4 is placed in a sintering apparatus for sintering, and then removed after natural cooling to room temperature to obtain a bismuth vanadate / alumina foam ceramic composite photocatalytic material.

[0071] As a further illustration of this embodiment, in step S1, the substrate material is zirconium oxide. The substrate material has a columnar shape and a porosity of 30 ppi.

[0072] As a further explanation of this embodiment, in step S1, the pretreatment is as follows: first, the substrate material is soaked in an acidic solution and an organic solution for 5 minutes respectively, then the substrate material is soaked in deionized water and ultrasonically cleaned for 5 minutes, and finally dried to obtain a pretreated substrate for later use.

[0073] As a further illustration of this embodiment, in step S2, the ethylene glycol concentration in the mixed solution A is 80%.

[0074] As a further illustration of this embodiment, in step S3, the soluble vanadium salt is ammonium metavanadate; the soluble bismuth salt is bismuth hydroxide; and the doping element is sodium tungstate.

[0075] As a further illustration of this embodiment, in step S3, the mixing ratio of soluble vanadium salt, soluble bismuth salt and mixed solution A in the mixed solution B is: soluble vanadium salt: soluble bismuth salt: mixed solution A = 1 mmol: 1 mmol: 20 ml.

[0076] As a further explanation of this embodiment, in step S4, the repeated impregnation means that after the previous impregnation, the pretreated substrate is dried before the next impregnation is performed.

[0077] As a further illustration of this embodiment, in step 5, the sintering device is a tube furnace, and the sintering parameters are: sintering temperature of 500℃, sintering heating rate of 20℃ / min, and sintering holding time of 120min. Example

[0078] A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material includes the following steps:

[0079] S1: The substrate material, alumina foam ceramic, is cleaned and then pretreated to obtain a pretreated substrate;

[0080] S2: Mix water, ethanol and ethylene glycol to obtain mixed solution A for later use;

[0081] S3: Dissolve the soluble vanadium salt, soluble bismuth salt and dopant element in the mixed solution A obtained in step S2, and continue stirring until dissolved to obtain mixed solution B;

[0082] S4: The pretreated substrate obtained in step S1 is repeatedly impregnated in the mixed solution B obtained in step S3, and then thoroughly dried to obtain the impregnated substrate material;

[0083] S5: The impregnated substrate material obtained in step S4 is placed in a sintering apparatus for sintering, and then removed after natural cooling to room temperature to obtain a bismuth vanadate / alumina foam ceramic composite photocatalytic material.

[0084] As a further illustration of this embodiment, in step S1, the substrate material is copper foam. The substrate material is tubular in shape, and the porosity of the substrate material is 50 ppi.

[0085] As a further explanation of this embodiment, in step S1, the pretreatment is as follows: first, the substrate material is soaked in an acidic solution and an organic solution for 60 minutes respectively, then the substrate material is soaked in deionized water and ultrasonically cleaned for 60 minutes, and finally dried to obtain a pretreated substrate for later use.

[0086] As a further illustration of this embodiment, in step S2, the ethylene glycol concentration in the mixed solution A is 60%.

[0087] As a further illustration of this embodiment, in step S3, the soluble vanadium salt is sodium metavanadate; the soluble bismuth salt is bismuth acetate and bismuth nitrate; and the doping element is sodium acetate and copper nitrate.

[0088] As a further illustration of this embodiment, in step S3, the mixing ratio of soluble vanadium salt, soluble bismuth salt and mixed solution A in the mixed solution B is: soluble vanadium salt: soluble bismuth salt: mixed solution A = 1 mmol: 1 mmol: 20 ml.

[0089] As a further explanation of this embodiment, in step S4, the repeated impregnation means that after the previous impregnation, the pretreated substrate is dried before the next impregnation is performed.

[0090] As a further illustration of this embodiment, in step 5, the sintering device is a muffle furnace, and the sintering parameters are: sintering temperature of 600℃, sintering heating rate of 30℃ / min, and sintering holding time of 30min. Example

[0091] A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material includes the following steps:

[0092] S1: The substrate material, alumina foam ceramic, is cleaned and then pretreated to obtain a pretreated substrate;

[0093] S2: Mix water, ethanol and ethylene glycol to obtain mixed solution A for later use;

[0094] S3: Dissolve the soluble vanadium salt, soluble bismuth salt and dopant element in the mixed solution A obtained in step S2, and continue stirring until dissolved to obtain mixed solution B;

[0095] S4: The pretreated substrate obtained in step S1 is repeatedly impregnated in the mixed solution B obtained in step S3, and then thoroughly dried to obtain the impregnated substrate material;

[0096] S5: The impregnated substrate material obtained in step S4 is placed in a sintering apparatus for sintering, and then removed after natural cooling to room temperature to obtain a bismuth vanadate / alumina foam ceramic composite photocatalytic material.

[0097] As a further illustration of this embodiment, in step S1, the substrate material is nickel foam. The substrate material is spherical in shape, and the porosity of the substrate material is 40 ppi.

[0098] As a further explanation of this embodiment, in step S1, the pretreatment is as follows: first, the substrate material is soaked in an acidic solution and an organic solution for 30 minutes respectively, then the substrate material is soaked in deionized water and ultrasonically cleaned for 20 minutes, and finally dried to obtain a pretreated substrate for later use.

[0099] As a further illustration of this embodiment, in step S2, the ethylene glycol concentration in the mixed solution A is 65%.

[0100] As a further illustration of this embodiment, in step S3, the soluble vanadium salt is vanadium pentoxide and sodium metavanadate; the soluble bismuth salt is bismuth hydroxide; and the doping element is ammonium tungstate, sodium tungstate, and sodium acetate.

[0101] As a further illustration of this embodiment, in step S3, the mixing ratio of soluble vanadium salt, soluble bismuth salt and mixed solution A in the mixed solution B is: soluble vanadium salt: soluble bismuth salt: mixed solution A = 1 mmol: 1 mmol: 20 ml.

[0102] As a further explanation of this embodiment, in step S4, the repeated impregnation means that after the previous impregnation, the pretreated substrate is dried before the next impregnation is performed.

[0103] As a further illustration of this embodiment, in step 5, the sintering device is a tube furnace, and the sintering parameters are: sintering temperature of 400℃, sintering heating rate of 30℃ / min, and sintering holding time of 60min.

[0104] Obviously, the above embodiments are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will recognize that other variations or modifications can be made based on the above description; it is neither necessary nor possible to exhaustively list all possible implementations; however, obvious variations or modifications derived therefrom are still within the scope of protection of the present invention.

Claims

1. A method for preparing a bismuth vanadate / alumina foam ceramic composite photocatalytic material, characterized in that... Includes the following steps: S1: The substrate material is cleaned and then pretreated to obtain a pretreated substrate; The substrate material is alumina foam ceramic; S2: Mix water, ethanol and ethylene glycol to obtain mixed solution A for later use; S3: Dissolve the soluble vanadium salt, soluble bismuth salt and dopant element in the mixed solution A obtained in step S2, and continue stirring until dissolved to obtain mixed solution B; S4: The pretreated substrate obtained in step S1 is repeatedly impregnated in the mixed solution B obtained in step S3, and then thoroughly dried to obtain the impregnated substrate material; S5: The impregnated substrate material obtained in step S4 is placed in a sintering apparatus for sintering, and then removed after natural cooling to room temperature to obtain a bismuth vanadate / alumina foam ceramic composite photocatalytic material.

2. The preparation method of the bismuth vanadate / alumina foam ceramic composite photocatalytic material according to claim 1, characterized in that: In step S1, the substrate material is spherical, columnar, or tubular in shape, and the porosity of the substrate material is 20ppi, 30ppi, 40ppi, or 50ppi.

3. The preparation method of the bismuth vanadate / alumina foam ceramic composite photocatalytic material according to claim 1, characterized in that: In step S1, the pretreatment is as follows: first, the substrate material is soaked in acidic solution and organic solution for 5-60 minutes respectively, then the substrate material is soaked in deionized water and ultrasonically cleaned for 5-60 minutes, and finally dried to obtain the pretreated substrate for use.

4. The preparation method of the bismuth vanadate / alumina foam ceramic composite photocatalytic material according to claim 1, characterized in that: In step S2, the ethylene glycol concentration in the mixed solution A is not less than 60%.

5. The preparation method of the bismuth vanadate / alumina foam ceramic composite photocatalytic material according to claim 1, characterized in that: In step S3, the soluble vanadium salt is one or a combination of two of ammonium metavanadate or sodium metavanadate; the soluble bismuth salt is one or a combination of two of bismuth nitrate or bismuth acetate; and the doping element is one or a combination of two or more of ammonium molybdate hydrate, ammonium tungstate, sodium tungstate, sodium acetate, or copper nitrate.

6. The preparation method of the bismuth vanadate / alumina foam ceramic composite photocatalytic material according to claim 1, characterized in that: In step S3, the mixing ratio of soluble vanadium salt, soluble bismuth salt and mixed solution A in the mixed solution B is: soluble vanadium salt: soluble bismuth salt: mixed solution A = 1 mmol: 1 mmol: 20 ml.

7. The preparation method of the bismuth vanadate / alumina foam ceramic composite photocatalytic material according to claim 1, characterized in that: In step S4, the repeated impregnation means that after the previous impregnation, the pretreated substrate is dried before the next impregnation is performed.

8. The preparation method of the bismuth vanadate / alumina foam ceramic composite photocatalytic material according to claim 1, characterized in that: In step 5, the sintering device is a muffle furnace or a tube furnace, and the sintering parameters are: sintering temperature of 400-600℃, sintering heating rate of 5-30℃ / min, and sintering holding time of 10-240min.

9. An application of a bismuth vanadate / alumina foam ceramic composite photocatalytic material, characterized in that: The bismuth vanadate / alumina foam ceramic composite photocatalytic material prepared by the preparation method according to any one of claims 1-8 is used to degrade dissolved pollutants in water.

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