Photocatalytic degradation of acid red B catalyst and preparation method thereof, and method for photocatalytic degradation of acid red B

Abstract

The present application relates to the technical field of molecular sieve preparation, and provides a preparation method of a photocatalytic degradation acid red B catalyst.The preparation method comprises the following steps: mixing SBA molecular sieve raw powder, a metal source, a first silicon source and an alkali solution to obtain a mixture, and then performing molding and drying on the mixture to obtain molecular sieve A; wherein the metal source comprises at least one of a vanadium source and a titanium source; mixing an organic template agent R, water, a second silicon source and an acid to obtain a solution B; adding the solution B into the molecular sieve A, and then performing hydrothermal crystallization, filtration, washing, drying and calcination to obtain the photocatalytic degradation acid red B catalyst.The preparation method is simple, and the catalyst prepared by the method is covered with a silicon dioxide film outside the molecular sieve, so that the metal active sites are not easy to flow away in the reaction process.The present application further provides a photocatalytic degradation acid red B catalyst and a method for photocatalytic degradation of acid red B.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of molecular sieve preparation, and more particularly to a photocatalytic degradation acid red B catalyst, a preparation method thereof, and a method for photocatalytic degradation of acid red B. BACKGROUND

[0002] Azo dyes are the most important dyes used in the global leather industry and printing and dyeing industry, accounting for more than 50% of industrial dyes, and have high chemical stability and are difficult to degrade, which are one of the main sources of water environmental pollution. Although azo dyes themselves have no direct carcinogenic effect, some of them are reduced to carcinogenic aromatic amines by specific enzymes in the human body, which poses a great threat to human health. Acid red B, also known as acid bordeaux B and acid red FB, is a representative of them. The dye wastewater has the characteristics of good resistance to sunlight, good oxidation resistance, strong stability, deep color, poor biodegradability, carcinogenicity, and teratogenicity, and has always been a problem in dye wastewater treatment.

[0003] Some people have tried to treat acid red B dye wastewater by physical adsorption, coagulation sedimentation, electrochemistry, advanced oxidation, wet hydrogen peroxide oxidation, ultrasonic oxidation, and biological methods. The disadvantages of the physical adsorption method are high cost, difficulty in cleaning and regeneration of the adsorbent, and insufficient adsorption force for some macromolecular dyes. The coagulation sedimentation method has high operating cost, large amount of sludge, and difficulty in dewatering, and poor treatment effect on hydrophilic dyes. The electrochemical method may produce alkaline substances and other toxic chemicals during the decolorization process of acid dyes. The advanced oxidation method has high raw material cost, and generally needs to adjust the pH after the reaction. The wet hydrogen peroxide oxidation method requires heating and pressurization conditions, has high cost, and is complex to operate. The oxidation speed of the ultrasonic oxidation method is slow, and the treatment capacity is limited. The selection of the biological method is difficult, and the color removal rate is not satisfactory. Among the numerous photocatalysts, Ti and V-based metals have become the mainstream materials for photocatalytic degradation of acid red B due to their excellent photocatalytic performance and relatively low cost.

[0004] The preparation method of the catalyst has a great influence on the properties of the noble metal supported catalyst. However, the metal components in the existing supported catalyst are dispersed on the surface of the carrier, which easily causes the loss of the metal components during the reaction, and thus the service life of the catalyst is shortened and the catalytic effect is reduced. SUMMARY

[0005] In order to solve the above technical problems, one of the purposes of the present application is to provide a preparation method of a photocatalytic degradation acid red B catalyst, which adds a silicon source used for synthesizing molecular sieve in the process of kneading the catalyst, and then hydrolyzes the silicon source into a viscous silica gel to bond the catalyst, and at the same time, improves the secondary pore distribution of the molecular sieve.

[0006] The present invention also aims to provide a catalyst for photocatalytic degradation of Acid Red B and a method for photocatalytic degradation of Acid Red B.

[0007] To achieve the above object, the technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a method for preparing a catalyst for photocatalytic degradation of Acid Red B, comprising:

[0009] S1. Mixing SBA molecular sieve powder, a metal source, a first silicon source, and an alkaline solution to obtain a mixture, and forming and drying the mixture to obtain molecular sieve A; wherein the metal source comprises at least one of a vanadium source and a titanium source;

[0010] S2. The organic template R, water, a second silicon source and an acid are mixed to obtain a solution B;

[0011] S3. Add solution B to molecular sieve A, perform hydrothermal crystallization, filter, wash, dry, and calcine to obtain a photocatalytic degradation catalyst for acid red B.

[0012] In the preparation method of photocatalytic degradation of acid red B provided by the present invention, the first silicon source is hydrolyzed under the action of an alkaline solution to generate a viscous silica mesh, and the viscous silica mesh bonds the molecular sieve particles to each other. After extrusion molding, the viscous silica mesh is transformed into a silicon dioxide film under the conditions of high temperature roasting, covering the silicon hydroxyl structure on the outer surface of the molecular sieve. Due to the silicon dioxide film and the skeleton structure silicon oxygen structure type of the molecular sieve itself, the outer surface of the molecular sieve is not covered and blocked. In practical applications, reactants can enter the outer surface of the molecular sieve from the silicon dioxide film in the form of diffusion. However, due to the metal distribution on the outer surface of the molecular sieve, the silicon dioxide film formed will have a gap at the position of the metal, and hydrothermal crystallization is carried out by adding a mixed solution of an organic template agent R, water, a second silicon source and an acid, and the position of the gap is crystallized and grown to form a complete silicon dioxide film on the outer surface of the molecular sieve. These silica films enhance the mechanical strength of the molecular sieve and provide a protective layer for the molecular sieve's structure. Because this protective layer is similar to the silica structure of the molecular sieve's framework, it does not affect the activity and diffusion properties of the molecular sieve itself. Furthermore, it prevents the loss of metal active sites during the reaction, effectively extending the lifespan and activity of the catalyst. Furthermore, the silica film formed on the molecular sieve's outer surface effectively prevents metal particle agglomeration at high temperatures, which can lead to catalyst deactivation.

[0013] According to some embodiments of the present invention, the vanadium source includes one or more of vanadium oxide, vanadic acid, and vanadate; and / or the titanium source includes one or more of titanium oxide, titanium-containing intermetallic compound, titanium-containing halide, titanium-containing inorganic salt, and titanium-containing organic salt.

[0014] According to some embodiments of the present application, the SBA molecular sieve crude powder comprises SBA-15 molecular sieve crude powder or SBA-16 molecular sieve crude powder.

[0015] According to some embodiments of the present application, the first silicon source comprises at least one of tetraethyl orthosilicate (TEOS), silica sol, water glass, preferably tetraethyl orthosilicate.

[0016] According to some embodiments of the present application, the alkali in the alkali solution comprises NaOH.

[0017] According to some embodiments of the present application, the organic template R comprises at least one of amphiphilic non-ionic triblock surfactant and hexamethylenetetramine (HMTA).

[0018] According to some embodiments of the present application, the amphiphilic non-ionic triblock surfactant comprises at least one of F127 (EO 106 PO 70 EO 106 ), F108 (EO 132 PO 50 EO 132 ), P123 (EO 20 PO 70 EO 20 ), P104 (EO 27 PO 61 EO 27 ).

[0019] According to some embodiments of the present application, when the SBA molecular sieve crude powder is SBA-15 molecular sieve crude powder, the organic template R is selected from one or more of P123 or P104; when the SBA molecular sieve crude powder is SBA-16 molecular sieve crude powder, the organic template R is selected from one or more of F127, F108 and HMTA.

[0020] According to some embodiments of the present application, the second silicon source comprises at least one of white carbon black, tetraethyl orthosilicate (TEOS), sodium silicate, silica sol, preferably tetraethyl orthosilicate.

[0021] According to some embodiments of the present application, the acid comprises at least one of hydrochloric acid, sulfuric acid, nitric acid, preferably hydrochloric acid.

[0022] According to some embodiments of the present application, the mass ratio of the metal source to the SBA molecular sieve crude powder is 1-10:100.

[0023] According to some embodiments of the present application, the mass ratio of the first silicon source to the SBA molecular sieve crude powder is 1:5-10.

[0024] According to some embodiments of the present application, the ratio of the molar amount of the base in the base solution to the molar amount of the first silicon source calculated as SiO2 is 0.5-4:1. - According to some embodiments of the present application, the ratio of the molar amount of the base in the base solution to the molar amount of the first silicon source calculated as SiO2 is 0.5-4:1.

[0025] According to some embodiments of the present application, the ratio of the molar amount of the base in the base solution to the molar amount of the first silicon source calculated as SiO2 is 0.5-4:1. - According to some embodiments of the present application, the ratio of the molar amount of the base in the base solution to the molar amount of the first silicon source calculated as SiO2 is 0.5-4:1.

[0026] According to some embodiments of the present application, the molar ratio of the components in the solution B is SiO2:a H2O:b R:c H + , wherein the value of a is 80-200, preferably 100-160, the value of b is 0.005-0.030, preferably 0.010-0.025, and the value of c is 0.10-0.25, preferably 0.15-0.20.

[0027] According to some embodiments of the present application, the mixture in the step S1 is dried first, and then the dried mixture is mixed with water and shaped.

[0028] According to some embodiments of the present application, the mass of the water mixed with the dried mixture is 10%-30%, preferably 15%-25% of the mass of the dried mixture.

[0029] According to some embodiments of the present application, the drying temperature in the step S1 is 100-140°C, preferably 110-130°C.

[0030] According to some embodiments of the present application, the crystallization temperature in the step S3 is 80-130°C, preferably 90-120°C, and the crystallization time is 24-90h, preferably 40-70h.

[0031] According to some embodiments of the present application, the drying temperature in the step S3 is 100-140°C, preferably 110-130°C.

[0032] According to some embodiments of the present application, the calcination temperature in the step S3 is 400-700°C, preferably 500-600°C, and the calcination time is 5-8h.

[0033] In the second aspect, the present application provides a photocatalyst for degrading acid red B, which is prepared by the method of the first aspect.

[0034] According to some embodiments of the present application, the surface of the photocatalyst for degrading acid red B comprises a silica shell, and preferably the particle diameter of the photocatalyst for degrading acid red B is 80-140nm.

[0035] In a third aspect, the present invention provides a method for photocatalytic degradation of Acid Red B, which is prepared by the preparation method described in the first aspect or the photocatalytic degradation of Acid Red B catalyst described in the second aspect to catalyze the reaction.

[0036] The beneficial effects of the present invention are at least:

[0037] The present invention provides a simple method for preparing a catalyst for photocatalytic degradation of Acid Red B. A metal source is directly added during the molecular sieve forming stage, eliminating the need for impregnation of the molecular sieve with a metal solution. The forming and metal loading processes are completed in a single step. The prepared metal-loaded SBA molecular sieve is coated with a silicon dioxide film, providing a protective layer for the molecular sieve structure. This prevents the loss of metal active sites during the reaction, effectively extending the catalyst's lifespan and activity. The catalyst can significantly improve the degradation efficiency of Acid Red B in the complete oxidation reaction of benzene. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 This is a scanning electron microscope image of the catalyst prepared in Example 4;

[0039] Figure 2 This is the XPS graph of the titanium atom of the catalyst prepared in Example 4. DETAILED DESCRIPTION

[0040] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to illustrate this patent in detail and do not limit the scope of protection of the present invention in any way.

[0041] Unless otherwise defined, the technical terms used in the following examples have the same meanings as commonly understood by those skilled in the art to which this invention belongs. The reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the raw materials, instruments, and equipment used in the following examples, etc., are all commercially available or can be obtained by existing methods; the reagent amounts used, unless otherwise specified, are the amounts used in conventional experimental procedures; and the experimental methods described, unless otherwise specified, are all conventional methods.

[0042] Among them, XPS uses Thermo's ESCALAB 250spectrometer X-ray photoelectron spectrometer to measure the bonding situation of metal particles.

[0043] The scanning electron microscope was a Hitachi S-4700 scanning electron microscope.

[0044] The photocatalytic degradation performance was determined using an XPA-II photoreactor (produced by Nanjing Xujiang Electromechanical Plant) and the absorbance was determined using a TU-1810 UV-visible spectrophotometer (produced by Beijing Puxi General Instrument Co., Ltd.).

[0045] Example 1

[0046] S1. Add 40g of SBA-16 molecular sieve powder, 0.8g of sodium pyrovanadate, 4g of tetraethyl orthosilicate (TEOS), and 0.3L of 0.1mol / L NaOH solution into a mortar and mix them. After mixing evenly, dry them at 100°C. Then, take 30g of the dried sample and place it into an extruder. Add 3g of deionized water and stir evenly before forming. The formed molecular sieve is dried at 100°C and recorded as molecular sieve A.

[0047] S2. 1.6 g of F127 and 34.5 g of deionized water were added to the reactor in sequence and stirred evenly. 24.1 mL of 0.1 mol / L hydrochloric acid solution was then added. Stirring was continued and 5 g of tetraethyl orthosilicate (TEOS) was slowly added dropwise to obtain solution B. The molar ratio of the components in solution B was SiO2: 80 H2O: 0.005 R: 0.1 H + .

[0048] S3. Solution B and molecular sieve A were mixed and transferred to a crystallization kettle. The temperature was raised to 90°C and crystallized at this constant temperature for 40 hours. After complete crystallization, the temperature was lowered to room temperature. The reaction mixture was separated, washed, and dried at 100°C. Finally, the catalyst sample was calcined at 400°C for 8 hours.

[0049] Example 2

[0050] S1. Add 40g of SBA-16 molecular sieve powder, 1.6g of sodium orthovanadate, 6g of silica sol (SW-25, with a silica content of 25wt%) and 0.3L of 0.1mol / L NaOH solution into a mortar and mix them. After mixing evenly, dry them at 100°C. Then take 30g of the dried sample and put it into an extruder. Add 6g of deionized water and stir evenly before starting to shape it. The formed molecular sieve is dried at 100°C and recorded as molecular sieve A.

[0051] S2. 4.4 g F108 and 54 g deionized water were added to the reactor in sequence, stirred evenly, and then 44.8 mL 0.1 mol / L sulfuric acid solution was added. Stirring was continued, and 2 g white carbon black (silicon dioxide content of 90 wt%) was slowly added dropwise to obtain solution B. The molar ratio of each component in solution B was SiO2: 100 H2O: 0.01R: 0.15H + .

[0052] S3. Solution B and molecular sieve A were mixed and transferred to a crystallization reactor. The temperature was raised to 100°C and crystallized at this constant temperature for 50 hours. After complete crystallization, the temperature was lowered to room temperature. The reaction mixture was separated, washed, and dried at 110°C. Finally, the catalyst sample was calcined at 500°C for 6 hours.

[0053] Example 3

[0054] S1. Add 40g of SBA-16 molecular sieve powder, 3.2g of ammonium metavanadate, 6g of tetraethyl orthosilicate (TEOS), and 0.15L of 0.1mol / L NaOH solution into a mortar and mix them. After mixing evenly, dry them at 100°C. Then, take 30g of the dried sample and put it into an extruder. Add 7.5g of deionized water and stir evenly before forming. The formed molecular sieve is dried at 100°C and recorded as molecular sieve A.

[0055] S2. 0.15 g of hexamethylenetetramine (HMTA) and 82.5 g of deionized water were added to the reactor in sequence and stirred evenly. 83 mL of 0.1 mol / L nitric acid solution was then added. Stirring was continued and 10 g of silica sol (SW-25, with a silica content of 25 wt%) was slowly added dropwise to obtain solution B. The molar ratio of the components in solution B was SiO2:110H2O:0.025R:0.2H + .

[0056] S3. Solution B and molecular sieve A were mixed and transferred to a crystallization reactor. The temperature was raised to 110°C and crystallized at this constant temperature for 60 hours. After complete crystallization, the temperature was lowered to room temperature. The reaction mixture was separated, washed, and dried at 120°C. Finally, the catalyst sample was calcined at 550°C for 7 hours.

[0057] Example 4

[0058] S1. Add 40g of SBA-15 molecular sieve powder, 3.2g of tetrabutyl titanate, 6g of tetraethyl orthosilicate (TEOS), and 0.3L of 0.1mol / L NaOH solution into a mortar and mix them. After mixing evenly, dry them at 130°C. Then, take 30g of the dried sample and put it into an extruder. Add 7.5g of deionized water and stir evenly before starting to shape it. The formed molecular sieve is dried at 130°C and recorded as molecular sieve A.

[0059] S2. 4.2 g of P104 and 38.9 g of deionized water were added to the reactor in sequence and stirred evenly. 60 mL of hydrochloric acid solution (0.1 mol / L) was then added. Stirring was continued and 5 g of tetraethyl orthosilicate (TEOS) was slowly added dropwise to obtain solution B. The molar ratio of the components in solution B was SiO2: 90 H2O: 0.03R: 0.25H+ .

[0060] S3. Solution B and molecular sieve A were mixed and transferred to a crystallization kettle. The temperature was raised to 130°C and crystallized at this constant temperature for 90 hours. After complete crystallization, the temperature was lowered to room temperature. The reaction mixture was separated, washed, and dried at 130°C. Finally, the catalyst sample was calcined at 400°C for 8 hours.

[0061] The scanning electron microscopy images of the obtained catalyst samples are shown in Figure 1 The XPS graph of the titanium atom state analysis of the obtained catalyst sample is shown in Figure 2 .Depend on Figure 1 and Figure 2 It can be seen that the metal in the catalyst obtained by the present invention is in the form of oxide (the peak of XPS titanium dioxide is 458.5eV) on the outer surface of the molecular sieve. Figure 2 It can be clearly seen that the outer surface is a silica spherical film and no metal oxide can be seen in the entire field of view, indicating that the metal oxide is on the outer surface of the molecular sieve inside the membrane, and the outer surface of the metal oxide is protected by the silica film, making it difficult for the metal on the outer surface of the molecular sieve to be lost during the reaction, thereby extending the service life of the catalyst.

[0062] Comparative Example 1

[0063] 40g SBA-15 molecular sieve powder and 14.2g pseudo-boehmite (Al2O3 content is 70wt%) are added to a mixer and mixed. After mixing evenly, 25.8g dilute nitric acid (HNO3 content is 6.3wt%) is added and kneaded, and then 15.5g deionized water is added and kneaded. The kneaded material is then placed in an extruder for molding. The molded molecular sieve is dried at 130°C and then calcined at 400°C for 8h. The molded molecular sieve sample is then mixed with 3.2g tetrabutyl titanate solution for 4h, dried at 130°C, and then calcined at 400°C for 8h to obtain a Ti / SBA-15 catalyst sample.

[0064] Comparative Example 2

[0065] S1. Add 40g of SBA-15 molecular sieve powder, 3.2g of tetrabutyl titanate, 6g of tetraethyl orthosilicate (TEOS), and 2.1L of 0.1mol / L NaOH solution into a mortar and mix them. After mixing evenly, dry them at 130°C. Then, take 30g of the dried sample and put it into an extruder. Add 7.5g of deionized water and stir evenly before starting to shape it. The formed molecular sieve is dried at 130°C and recorded as molecular sieve A.

[0066] S2. 4.2 g of P104 and 38.9 g of deionized water were sequentially added into a reactor, stirred uniformly, 60 mL of hydrochloric acid solution (0.1 mol / L) was added, stirring was continued, 5 g of tetraethyl orthosilicate (TEOS) was added dropwise slowly, to obtain solution B, the molar ratio of each component in solution B was SiO2:90H2O:0.03R:0.25H + .

[0067] S3. After mixing solution B and molecular sieve A, the mixture was transferred into a crystallization kettle, the temperature was increased to 130℃, and the temperature was kept constant for 90 h of crystallization. After the crystallization was completed, the temperature was reduced to room temperature, the reacted mixture was separated, washed, and dried at 130℃, and finally the catalyst sample was obtained after calcination at 400℃ for 8 h.

[0068] Catalytic effect evaluation

[0069] The catalyst samples prepared in each example and comparative example were used for the experiment of photocatalytic degradation of acid red B, and the specific process was as follows:

[0070] Deionized water was used as a solvent to prepare an acid red B solution with a concentration of 50 mg / L as simulated wastewater. 400 mL of the reaction solution was placed in a light reaction instrument, and 0.1 g / L of the catalyst was added. A 300W medium pressure mercury lamp was used for irradiation, the wavelength range of the light emitted by the mercury lamp was 250-720 nm, the main wavelength was 365 nm, and the light intensity of the mercury lamp at 365 nm was 0.19 kW / m 2 After irradiation for 120 min, the sample was taken when the photocatalytic reaction reached equilibrium, the suspension was centrifuged (3500 r / min, 30 min), and the supernatant was taken. The absorbance of acid red B at the maximum absorption wavelength of 518 nm was measured by a UV-visible spectrophotometer to evaluate the photocatalytic degradation activity of acid red B on the catalyst. The test results are shown in Table 1.

[0071] Table 1

[0072] Acid Red B removal rate (%) Example 1 98.2 Example 2 98.6 Example 3 98.9 Example 4 99.5 Comparative Example 1 75.7 Comparative Example 2 25.0

[0073] From the above test results, it can be seen that the catalyst prepared by the preparation method provided in the present application in examples 1-4 has excellent catalytic performance in acid red B removal rate.

[0074] Comparative example 1 used the traditional loading and impregnation method. First, the active sites in the catalyst of the same mass prepared by the traditional method were relatively less due to the addition of a binder during the molding process. Second, the metal on the surface of the molecular sieve was prone to loss during the reaction process due to the lack of protection of the outer surface silica film, which caused the activity of the catalyst to decrease.

[0075] In Comparative Example 2, due to the addition of too much base, the molecular sieve skeleton itself collapsed while the silicon source was hydrolyzed to form a silicon dioxide film and a sticky network, resulting in very low catalytic activity.

[0076] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation of the present invention. The present invention has been described with reference to typical embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein. On the contrary, the present invention can be extended to all other methods and applications with the same function.

Claims

1. A method for preparing a catalyst for photocatalytic degradation of acid red B, characterized in that: The following steps are involved: S1. Mixing SBA molecular sieve powder, a metal source, a first silicon source, and an alkaline solution to obtain a mixture, and shaping and drying the mixture to obtain molecular sieve A; wherein the metal source comprises at least one of a vanadium source and a titanium source; S2. Mixing the organic template R, water, a second silicon source, and an acid to obtain a solution B; S3. Add solution B to molecular sieve A, perform hydrothermal crystallization, filter, wash, dry, and calcine to obtain a photocatalytic degradation catalyst for acid red B. The first silicon source includes at least one of ethyl orthosilicate, silica sol, and water glass; the alkali solution contains OH - The ratio of the molar amount of the base calculated as SiO2 to the molar amount of the first silicon source calculated as SiO2 is 0.5~4:

1.

2. The preparation method according to claim 1, characterized in that The vanadium source includes one or more of vanadium oxide, vanadic acid, and vanadate; and / or the titanium source includes one or more of titanium oxide, titanium-containing intermetallic compound, titanium-containing halide, titanium-containing inorganic salt, and titanium-containing organic salt.

3. The preparation method according to claim 1, characterized in that The SBA molecular sieve raw powder includes SBA-15 molecular sieve raw powder or SBA-16 molecular sieve raw powder; And / or, the first silicon source is tetraethyl orthosilicate; And / or, the alkali in the alkali solution comprises NaOH.

4. The preparation method according to any one of claims 1 to 3, characterized in that The organic template R includes at least one of an amphiphilic nonionic triblock surfactant and hexamethylenetetramine; And / or, the second silicon source includes at least one of white carbon black, ethyl orthosilicate, sodium silicate, and silica sol; And / or, the acid includes at least one of hydrochloric acid, sulfuric acid, and nitric acid.

5. The preparation method according to claim 4, characterized in that The amphiphilic nonionic triblock surfactant includes at least one of F127, F108, P123, and P104; And / or, the second silicon source is tetraethyl orthosilicate; And / or, the acid is hydrochloric acid.

6. The preparation method according to any one of claims 1 to 3, characterized in that The mass ratio of the metal source to the SBA molecular sieve raw powder is 1-10:100; And / or, the mass ratio of the first silicon source to the SBA molecular sieve raw powder is 1:5-10; And / or, the alkali solution contains OH - The ratio of the molar amount of the base calculated as SiO2 to the molar amount of the first silicon source calculated as SiO2 is 0.5~3.5:

1.

7. The preparation method according to any one of claims 1 to 3, characterized in that The molar ratio of each component in the solution B is SiO2:a H2O:b R:c H + , where the value of a is 80~200, the value of b is 0.005~0.030, and the value of c is 0.10~0.

25.

8. The preparation method according to claim 7, characterized in that The value of a is 100 to 160, and / or the value of b is 0.010 to 0.025, and / or the value of c is 0.15 to 0.

20.

9. The preparation method according to any one of claims 1 to 3, characterized in that The mixture in step S1 is first dried, and then the dried mixture is mixed with water and then formed.

10. The preparation method according to claim 9, characterized in that The mass of water mixed with the dried mixture is 10% to 30% of the mass of the dried mixture.

11. The preparation method according to claim 10, characterized in that: The mass of water mixed with the dried mixture is 15% to 25% of the mass of the dried mixture.

12. The preparation method according to any one of claims 1 to 3, characterized in that The drying temperature in step S1 is 100-140°C; And / or, the crystallization temperature in step S3 is 80-130° C.; the crystallization time is 24-90 h; And / or, the drying temperature in step S3 is 100-140°C; And / or, the calcination temperature in step S3 is 400-700° C.; and the calcination time is 5-8 h.

13. The preparation method according to claim 12, characterized in that The drying temperature in step S1 is 110-130°C; and / or, the crystallization temperature in step S3 is 90-120° C.; and / or, the crystallization time is 40-70 h; And / or, the drying temperature in step S3 is 110-130° C.; And / or, the calcination temperature in step S3 is 500-600°C.

14. A catalyst for photocatalytic degradation of Acid Red B, prepared by the preparation method according to any one of claims 1 to 13, wherein the surface of the catalyst for photocatalytic degradation of Acid Red B comprises a silicon dioxide shell layer.

15. The catalyst according to claim 14, characterized in that The particle diameter of the catalyst is 80-140 nm.

16. A method for photocatalytic degradation of Acid Red B, wherein the reaction is catalyzed by the catalyst prepared by the preparation method according to any one of claims 1 to 13 or the catalyst according to claim 14 or 15.

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