Bi2SiO5 / carbon foam composite photoelectric catalytic material as well as preparation method and application thereof

Abstract

The invention discloses a Bi2SiO5 / carbon foam composite photoelectrocatalytic material and a preparation method and application thereof.The preparation method comprises the steps that Bi2SiO5 powder is prepared, then the Bi2SiO5 powder, an isopropanol solution, a polybenzoquinone solution and iodine elementary substance are prepared into a Bi2SiO5 precursor solution according to an example ratio, a pretreated carbon foam substrate is placed in a negative electrode of a hydrothermal electrophoretic deposition instrument, the Bi2SiO5 precursor solution is placed in the hydrothermal electrophoretic deposition instrument for deposition, and the Bi2SiO5 / carbon foam composite photoelectrocatalytic material is obtained; the preparation method comprises the following steps: adding the Bi2SiO5 / carbon foam substrate into a reaction kettle, carrying out deposition for 1-20 minutes under the voltage of 15-30V, then closing the equipment, taking out the carbon foam substrate, and drying to obtain the required Bi2SiO5 / carbon foam photoelectric catalyst. The material has good light absorption and excellent conductivity, the efficiency of photoelectrocatalysis water splitting is greatly improved, the problem of low conductivity of a Bi2SiO5 pure phase is solved, the limitation of the material is broken through, and the material has an excellent photoelectrocatalysis prospect; compared with a traditional photoelectrode, the integrated photoelectrode made of the carbon foam material is more stable, wide in adaptability, capable of stably working for a long time, easy in process control, simple in process, short in period and low in energy consumption.

Description

Technical Field

[0001] The present invention belongs to the technical field of functional materials, and relates to photoelectrocatalytic materials, and specifically to a Bi 2 SiO 5 / Carbon foam composite photoelectrocatalytic material and its preparation method and application. Background Art

[0002] The global energy crisis and environmental pollution caused by fossil fuels have driven a lot of research on clean renewable energy. Photoelectrocatalytic water splitting is considered to be a potential strategy to solve the above problems.

[0003] Bi 2 O 2 SiO 3 (-3.5eV) is a typical Aurivillius family photocatalytic material. From its crystal structure, it can be seen that it is [Bi 2 O 2 ] n 2n+ Layer and perovskite-like [SiO 3 ] n 2n- The layers alternate with each other in an orthogonal structure. This structure is conducive to the separation of photoexcited electron-hole pairs, forming an internal electric field between the plates, thereby improving the photocatalytic performance. The valence band (VB) of BSO is assisted by O 2p and Bi 6p orbitals, and the conduction band (CB) is assisted by Si 5d orbitals. The hybridization of Bi 6s and O2p leads to a large dispersion of VB, which accelerates the migration of photoexcited holes. However, Bi 2 SiO 5 The weak conductivity makes it difficult to extract the electron-hole pairs generated by sunlight, which seriously limits the 2 SiO 5 practical applications. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention aims to provide a 2 SiO 5 / Carbon foam composite photoelectrocatalytic material and its preparation method and application. The material has good light absorption and excellent electrical conductivity, greatly improves the efficiency of photoelectrocatalytic water splitting, and has a simple process, short cycle and low energy consumption.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A kind of Bi 2 SiO 5 The method for preparing a carbon foam composite photoelectrocatalytic material comprises the following steps:

[0007] Step 1: Take Bi(NO 3 ) 3 ·5H 2 O, ethyl orthosilicate and sodium triacetoxyborohydride, Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water to prepare solution A; ethyl orthosilicate was used as a raw material, sodium triacetoxyborohydride and deionized water were added to prepare solution B;

[0008] Mix solution A and solution B, stir evenly and adjust the pH value to 7-13 to obtain Bi 2 SiO 5 Precursor fluid;

[0009] Step 2: Bi prepared in step 1 2 SiO 5 The precursor liquid is filled into the lining of the reactor, placed in a vacuum oven for reaction, and kept at 100-200°C for 6-30 hours. After the temperature in the oven drops to room temperature, the reactor is taken out and cooled. After centrifugation, washing, and drying, a powder is obtained, namely Bi 2 SiO 5 Powder;

[0010] Step 3: Follow Bi 2 SiO 5 The mass ratio of powder, isopropanol solution, polybenzoquinone solution and iodine is (1-5): (1-10): (1-10): (1-5), and Bi 2 SiO 5 The powder is placed in a beaker, and isopropanol solution and polybenzoquinone solution are added, stirred until uniformly dispersed, and then iodine is added and stirred until uniformly dispersed to obtain Bi 2 SiO 5 Precursor solution;

[0011] Wherein, the mass percentage concentration of the isopropanol solution is 90% to 98%, and the concentration of the polybenzoquinone solution is 0.1-0.5M;

[0012] Step 4: Select a density of 0.5 to 1.3 g / cm 3 The carbon foam substrate is cleaned, low temperature heat treated and cut pre-treated;

[0013] Step 5: Place the pretreated carbon foam substrate on the negative electrode of the hydrothermal electrophoretic deposition apparatus and 2 SiO 5 The precursor solution is placed in the deposition chamber and deposited at a voltage of 15 to 30 V for 1 to 20 minutes. After that, the equipment is turned off, the carbon foam substrate is taken out, and the desired Bi is obtained after drying.2 SiO 5 / Carbon foam photoelectrocatalyst.

[0014] The present invention also has the following technical features:

[0015] Preferably, the pH adjusting agent used to adjust the pH in step 1 is 0.1-10M NH 3 ·H 2 O solution.

[0016] Preferably, the stirring in step 1 and step 3 is carried out by using a magnetic stirrer for 30 to 120 minutes.

[0017] Preferably, the filling ratio of the reactor lining in step 2 is 30% to 50%.

[0018] Preferably, the washing in step 2 is performed by washing with deionized water for 3 to 5 times.

[0019] Preferably, the drying in step 2 and step 5 is performed by placing the product in an oven at 80° C. for 12 to 24 hours.

[0020] Preferably, the pretreatment method of the carbon foam substrate described in step 4 comprises:

[0021] The carbon foam substrate was sequentially immersed in acetone and nitric acid solutions with concentrations of 0.1 to 1 M and ultrasonically treated for 30 to 90 minutes. After ultrasonication, it was washed with deionized water and anhydrous ethanol, and then low-temperature heat treated at 10 to 300° C. for 1 to 5 hours to obtain a CC substrate and cut it into small pieces of 1*1 cm.

[0022] Preferably, the molecular weight of the polybenzoquinone is in the range of 3000 to 6000.

[0023] The present invention also protects a Bi prepared by the method as described above 2 SiO 5 / carbon foam composite photoelectrocatalytic materials and their application as anode materials in photoelectrocatalytic water splitting process.

[0024] Compared with the prior art, the present invention has the following technical effects:

[0025] The present invention adopts hydrothermal deposition technology, takes carbon-carbon composite material as carrier, and deposits Bi on its surface. 2 SiO 5 The carbon foam substrate is a lightweight porous carbon material with good mechanical properties. Its loose and porous structure increases the specific surface area and increases the active sites of deposition, thus preparing a highly stable and adaptable single-chip optical Bi 2 SiO 5 / carbon foam composite photoelectrocatalytic electrode material, which has good light absorption and excellent electrical conductivity, greatly improves the efficiency of photoelectrocatalytic water splitting and solves the problem of Bi 2 SiO 5 The problem of low pure phase conductivity has been overcome, and the material limitation has been overcome, which has excellent prospects for photoelectrocatalysis. The integrated photoelectrode of carbon foam material is more stable than the traditional photoelectrode, has a wide range of adaptability, and can work stably for a long time.

[0026] The preparation method of the invention has an easy-to-control process, can carry out precise directional synthesis, and has a simple process, a short cycle, and low energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is the X-ray diffraction analysis diagram of Bi2SiO5 prepared in Example 2;

[0028] Figure 2 This is a graph showing the oxygen evolution performance of the Bi2SiO5 / carbon foam prepared in Example 2 in a solution with a pH of 9.5;

[0029] Figure 3 This is a scanning electron microscope image of Bi2SiO5 prepared in Example 2. DETAILED DESCRIPTION

[0030] The specific contents of the present invention are further explained in detail below in conjunction with embodiments.

[0031] The molecular weight of the polybenzoquinone used in the following examples ranges from 3000 to 6000.

[0032] Example 1

[0033] A kind of Bi 2 SiO 5 The method for preparing a carbon foam composite photoelectrocatalytic material comprises the following steps:

[0034] Step 1: Take Bi(NO 3 ) 3 ·5H 2 O, ethyl orthosilicate and sodium triacetoxyborohydride, Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water to prepare solution A; ethyl orthosilicate was used as a raw material, sodium triacetoxyborohydride and deionized water were added to prepare solution B;

[0035] Mix solution A and solution B, stir with a magnetic stirrer for 30 min until homogeneous, and then add 0.1 M NH 3 ·H 2 O solution was adjusted to pH 13 to obtain Bi2 SiO 5 Precursor fluid;

[0036] Step 2: Bi prepared in step 1 2 SiO 5 The precursor liquid was filled into the reactor lining with a filling ratio of 30%, and the reactor was placed in a vacuum oven for reaction at 150°C for 10 hours. After the temperature in the oven dropped to room temperature, the reactor was taken out for cooling, centrifuged, washed with deionized water for 3 times, and placed in an oven at 80°C for 12 hours to obtain a powder, namely Bi 2 SiO 5 Powder;

[0037] Step 3: Follow Bi 2 SiO 5 The mass ratio of powder, isopropanol solution, polybenzoquinone solution and iodine is 1:10:10:1. 2 SiO 5 The powder was placed in a beaker, and isopropanol solution and polybenzoquinone solution were added. The powder was stirred with a magnetic stirrer for 30 minutes until it was evenly dispersed. Then, iodine was added and stirred with a magnetic stirrer for another 30 minutes until it was evenly dispersed. Bi 2 SiO 5 Precursor solution;

[0038] Wherein, the mass percentage concentration of the isopropanol solution is 90%, and the concentration of the polybenzoquinone solution is 0.1M;

[0039] Step 4: Select a density of 0.5g / cm 3 The carbon foam substrate was immersed in 0.1M acetone and nitric acid solutions for ultrasonic treatment for 30 minutes, washed with deionized water and anhydrous ethanol after ultrasonic treatment, and then heat treated at 10°C for 5 hours to obtain a CC substrate and cut into small pieces of 1*1 cm;

[0040] Step 5: Place the pretreated carbon foam substrate on the negative electrode of the hydrothermal electrophoretic deposition apparatus and 2 SiO 5 The precursor solution was placed in the deposition chamber and deposited at 15V for 20min. After that, the equipment was turned off, the carbon foam substrate was taken out, and it was placed in an oven at 80℃ for 12h to obtain the desired Bi 2 SiO 5 / Carbon foam photoelectrocatalyst.

[0041] Example 2

[0042] A kind of Bi 2 SiO 5 The method for preparing a carbon foam composite photoelectrocatalytic material comprises the following steps:

[0043] Step 1: Take Bi(NO 3 ) 3 ·5H 2 O, ethyl orthosilicate and sodium triacetoxyborohydride, Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water to prepare solution A; ethyl orthosilicate was used as a raw material, sodium triacetoxyborohydride and deionized water were added to prepare solution B;

[0044] Mix solution A and solution B, stir with a magnetic stirrer for 60 min until homogeneous, and then add 0.5 M NH 3 ·H 2 O solution was adjusted to pH 7 to obtain Bi 2 SiO 5 Precursor fluid;

[0045] Step 2: Bi prepared in step 1 2 SiO 5 The precursor liquid was filled into the reactor lining with a filling ratio of 50%, and the reactor was placed in a vacuum oven for reaction at 180°C for 15 hours. After the temperature in the oven dropped to room temperature, the reactor was taken out for cooling, centrifuged, washed with deionized water for 5 times, and placed in an oven at 80°C for 18 hours to obtain a powder, namely Bi 2 SiO 5 Powder;

[0046] Step 3: Follow Bi 2 SiO 5 The mass ratio of powder, isopropanol solution, polybenzoquinone solution and iodine is 3:5:5:1. 2 SiO 5 The powder was placed in a beaker, and isopropanol solution and polybenzoquinone solution were added. The powder was stirred for 60 minutes with a magnetic stirrer until it was evenly dispersed. Then, iodine was added and stirred for 60 minutes with a magnetic stirrer until it was evenly dispersed. Bi 2 SiO 5 Precursor solution;

[0047] Wherein, the mass percentage concentration of the isopropanol solution is 95%, and the concentration of the polybenzoquinone solution is 0.3M;

[0048] Step 4: Select the density as 1g / cm 3 The carbon foam substrate was immersed in 0.5M acetone and nitric acid solutions for ultrasonic treatment for 60 min, washed with deionized water and anhydrous ethanol after ultrasonic treatment, and then heat treated at 100°C for 2 h to obtain a CC substrate and cut into small pieces of 1*1 cm;

[0049] Step 5: Place the pretreated carbon foam substrate on the negative electrode of the hydrothermal electrophoretic deposition apparatus and 2 SiO 5 The precursor solution was placed in the deposition chamber and deposited at 20V for 10 minutes. After that, the equipment was turned off, the carbon foam substrate was taken out, and it was placed in an oven at 80℃ for 18 hours to obtain the desired Bi. 2 SiO 5 / Carbon foam photoelectrocatalyst.

[0050] Figure 1 Bi prepared in Example 2 2 SiO 5 X-ray diffraction analysis diagram, where the horizontal axis is the 2θ angle and the vertical axis is the diffraction peak intensity, can accurately correspond to Bi 2 SiO 5 PDF#75-1483, showing the successful preparation of Bi 2 SiO 5 catalyst.

[0051] The prepared Bi 2 SiO 5 The photoelectrocatalytic effect of the carbon foam sample was tested. The specific test process includes cutting the composite photoelectrocatalyst into 1*1cm size, placing it in a sodium borate buffer solution with a pH of 9.5, and conducting a photoelectrocatalytic oxygen evolution test.

[0052] Figure 2 Bi prepared in Example 2 2 SiO 5 / Carbon foam oxygen evolution performance in a solution with a pH of 9.5. It can be clearly seen from the figure that the photoelectric catalyst prepared by the present invention has good visible light oxygen production performance.

[0053] Figure 3 Bi prepared in Example 2 2 SiO 5 Scanning electron microscope image of .

[0054] Example 3

[0055] A kind of Bi 2 SiO 5 The method for preparing a carbon foam composite photoelectrocatalytic material comprises the following steps:

[0056] Step 1: Take Bi(NO 3 ) 3 ·5H 2 O, ethyl orthosilicate and sodium triacetoxyborohydride, Bi(NO 3 ) 3 ·5H 2O is dissolved in deionized water to prepare solution A; tetraethyl orthosilicate is used as a raw material, and sodium triacetoxyborohydride and deionized water are added to prepare solution B;

[0057] Solutions A and B are mixed and stirred with a magnetic stirrer for 120 min until homogeneous, and then the pH value is adjusted to 11 with 5M NH 3 ·H 2 O solution to obtain a Bi 2 SiO 5 precursor solution;

[0058] Step 2: The Bi 2 SiO 5 precursor solution prepared in Step 1 is filled into the inner lining of the reaction kettle with a filling ratio of 40%, placed in a vacuum oven for reaction, kept at 200 °C for 6 h, the reaction kettle is taken out and cooled after the temperature in the oven drops to room temperature, and after centrifugation, washed 4 times with deionized water, and dried in the oven at 80 °C for 24 h to obtain a powder, namely Bi 2 SiO 5 powder;

[0059] Step 3: According to the mass ratio of Bi 2 SiO 5 powder, isopropanol solution, polybenzoquinone solution and iodine are 5:10:10:3, take Bi 2 SiO 5 powder and place it in a beaker, add isopropanol solution and polybenzoquinone solution, stir with a magnetic stirrer for 120 min until evenly dispersed, and then add iodine and continue to stir with a magnetic stirrer for 120 min until evenly dispersed, that is, obtain a Bi 2 SiO 5 precursor solution;

[0060] Among them, the mass percentage concentration of the isopropanol solution is 98%, and the concentration of the polybenzoquinone solution is 0.5M;

[0061] Step 4: Select a carbon foam substrate with a density of 1.3 g / cm 3 and soak the carbon foam substrate in acetone and nitric acid solutions with a concentration of 1M successively for 90 min of ultrasonic treatment. After ultrasonic treatment, it is washed with deionized water and absolute ethanol, and then subjected to low-temperature heat treatment at 300 °C for 1 h to obtain a C-C substrate and cut it into small pieces of 1*1 cm;

[0062] Step 5: Place the pretreated carbon foam substrate at the negative electrode of the hydrothermal electrophoresis deposition instrument, place the Bi 2 SiO 5 precursor solution for deposition, deposit at a voltage of 30 V for 1 min, then turn off the equipment, take out the carbon foam substrate, and dry it in the oven at 80 °C for 24 h to obtain the required Bi 2SiO 5 / Carbon foam photoelectrocatalyst.

[0063] Example 4

[0064] A kind of Bi 2 SiO 5 The method for preparing a carbon foam composite photoelectrocatalytic material comprises the following steps:

[0065] Step 1: Take Bi(NO 3 ) 3 ·5H 2 O, ethyl orthosilicate and sodium triacetoxyborohydride, Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water to prepare solution A; ethyl orthosilicate was used as a raw material, sodium triacetoxyborohydride and deionized water were added to prepare solution B;

[0066] Mix solution A and solution B, stir with a magnetic stirrer for 50 min until homogeneous, and then add 10 M NH 3 ·H 2 O solution was adjusted to pH 10 to obtain Bi 2 SiO 5 Precursor fluid;

[0067] Step 2: Bi prepared in step 1 2 SiO 5 The precursor solution was filled into the reactor lining with a filling ratio of 35%, and the reactor was placed in a vacuum oven for reaction at 100°C for 30 hours. After the temperature in the oven dropped to room temperature, the reactor was taken out for cooling, centrifuged, washed with deionized water for 5 times, and placed in an oven at 80°C for 15 hours to obtain a powder, namely Bi 2 SiO 5 Powder;

[0068] Step 3: Follow Bi 2 SiO 5 The mass ratio of powder, isopropanol solution, polybenzoquinone solution and iodine is 2:1:1:5. 2 SiO 5 The powder was placed in a beaker, and isopropanol solution and polybenzoquinone solution were added. The powder was stirred with a magnetic stirrer for 30 minutes until it was evenly dispersed. Then, iodine was added and stirred with a magnetic stirrer for another 30 minutes until it was evenly dispersed. Bi 2 SiO 5 Precursor solution;

[0069] Wherein, the mass percentage concentration of the isopropanol solution is 96%, and the concentration of the polybenzoquinone solution is 0.2M;

[0070] Step 4: Select a density of 1.2 g / cm 3 The carbon foam substrate was immersed in 0.8M acetone and nitric acid solutions for ultrasonic treatment for 30 minutes, washed with deionized water and anhydrous ethanol after ultrasonic treatment, and then heat treated at 50°C for 2 hours to obtain a CC substrate and cut into small pieces of 1*1 cm;

[0071] Step 5: Place the pretreated carbon foam substrate on the negative electrode of the hydrothermal electrophoretic deposition apparatus and 2 SiO 5 The precursor solution was placed in the deposition chamber and deposited at 25 V for 5 min. After that, the equipment was turned off, the carbon foam substrate was taken out, and it was placed in an oven at 80 ° C for 12 h to obtain the desired Bi 2 SiO 5 / Carbon foam photoelectrocatalyst.

[0072] Example 5

[0073] A kind of Bi 2 SiO 5 The method for preparing a carbon foam composite photoelectrocatalytic material comprises the following steps:

[0074] Step 1: Take Bi(NO 3 ) 3 ·5H 2 O, ethyl orthosilicate and sodium triacetoxyborohydride, Bi(NO 3 ) 3 ·5H 2 O was dissolved in deionized water to prepare solution A; ethyl orthosilicate was used as a raw material, sodium triacetoxyborohydride and deionized water were added to prepare solution B;

[0075] Mix solution A and solution B, stir with a magnetic stirrer for 80 min until homogeneous, and then add 3M NH 3 ·H 2 O solution was adjusted to pH 8 to obtain Bi 2 SiO 5 Precursor fluid;

[0076] Step 2: Bi prepared in step 1 2 SiO 5 The precursor solution was filled into the reactor lining with a filling ratio of 45%, and the reactor was placed in a vacuum oven for reaction at 120°C for 20 hours. After the temperature in the oven dropped to room temperature, the reactor was taken out for cooling, centrifuged, washed with deionized water for 5 times, and placed in an oven at 80°C for 15 hours to obtain a powder, namely Bi 2 SiO 5 Powder;

[0077] Step 3: Follow Bi2 SiO 5 The mass ratio of powder, isopropanol solution, polybenzoquinone solution and iodine is 5:1:1:5. 2 SiO 5 The powder was placed in a beaker, and isopropanol solution and polybenzoquinone solution were added. The powder was stirred with a magnetic stirrer for 30 minutes until it was evenly dispersed. Then, iodine was added and stirred with a magnetic stirrer for another 30 minutes until it was evenly dispersed. Bi 2 SiO 5 Precursor solution;

[0078] Wherein, the mass percentage concentration of the isopropanol solution is 90%, and the concentration of the polybenzoquinone solution is 0.4M;

[0079] Step 4: Select a density of 0.8 g / cm 3 The carbon foam substrate was immersed in 0.5M acetone and nitric acid solutions for ultrasonic treatment for 50 min, washed with deionized water and anhydrous ethanol after ultrasonic treatment, and then heat treated at 200°C for 1.5 h to obtain a CC substrate and cut into small pieces of 1*1 cm;

[0080] Step 5: Place the pretreated carbon foam substrate on the negative electrode of the hydrothermal electrophoretic deposition apparatus and 2 SiO 5 The precursor solution was placed in the deposition chamber and deposited at 20V for 20 minutes. After that, the equipment was turned off, the carbon foam substrate was taken out, and it was placed in an oven at 80℃ for 20 hours to obtain the desired Bi 2 SiO 5 / Carbon foam photoelectrocatalyst.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it; without departing from the concept of the present invention, the deduction or replacement made by those skilled in the art shall fall within the protection scope of the present invention.

Claims

1. A method for preparing a Bi2SiO5 / carbon foam composite photoelectrocatalytic material, characterized in that: The following steps are involved: Step 1: Take Bi(NO3)3·5H2O, tetraethyl orthosilicate and sodium triacetoxyborohydride in a mass ratio of (5-10):(1-10):(1-10), dissolve Bi(NO3)3·5H2O in deionized water to prepare solution A; take tetraethyl orthosilicate as a raw material, add sodium triacetoxyborohydride and deionized water to prepare solution B; Mix solution A and solution B, stir evenly and adjust the pH value to 7-13 to obtain a Bi2SiO5 precursor solution; Step 2: Fill the Bi2SiO5 precursor solution prepared in step 1 into the inner lining of the reactor, place it in a vacuum oven for reaction, and keep it at 100-200°C for 6-30h. After the temperature in the oven drops to room temperature, take out the reactor and cool it. After centrifugation, washing, and drying, a powder, i.e., Bi2SiO5 powder, is obtained. Step 3: According to the mass ratio of Bi2SiO5 powder, isopropanol solution, polybenzoquinone solution and iodine (1-5): (1-10): (1-10): (1-5), Bi2SiO5 powder is placed in a beaker, isopropanol solution and polybenzoquinone solution are added, and the mixture is stirred until uniformly dispersed. Then, iodine is added and the mixture is stirred until uniformly dispersed to obtain a Bi2SiO5 precursor solution. Wherein, the mass percentage concentration of the isopropanol solution is 90% to 98%, and the concentration of the polybenzoquinone solution is 0.1-0.5M; Step 4: Select a density of 0.5 to 1.3 g / cm 3 The carbon foam substrate is cleaned, low temperature heat treated and cut pre-treated; Step 5: Place the pretreated carbon foam substrate on the negative electrode of the hydrothermal electrophoretic deposition apparatus, place the Bi2SiO5 precursor solution in for deposition at a voltage of 15-30V for 1-20min, then turn off the equipment, take out the carbon foam substrate, and dry it to obtain the desired Bi2SiO5 / carbon foam photoelectric catalyst.

2. The method for preparing the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 1, characterized in that: The pH adjusting agent used for adjusting the pH in step 1 is a 0.1-10M NH3·H2O solution.

3. The method for preparing the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 1, characterized in that: The stirring in step 1 and step 3 is carried out by using a magnetic stirrer for 30 to 120 minutes.

4. The method for preparing the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 1, characterized in that: The filling ratio of the reactor lining described in step 2 is 30% to 50%.

5. The method for preparing the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 1, characterized in that: The washing in step 2 is performed by washing with deionized water for 3 to 5 times.

6. The method for preparing the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 1, characterized in that: The drying in step 2 and step 5 is performed by placing the mixture in an oven at 80° C. for 12 to 24 hours.

7. The method for preparing the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 1, characterized in that: The pretreatment method of the carbon foam substrate described in step 4 includes: The carbon foam substrate was sequentially immersed in acetone and nitric acid solutions with concentrations of 0.1 to 1 M and ultrasonically treated for 30 to 90 minutes. After ultrasonication, it was washed with deionized water and anhydrous ethanol, and then low-temperature heat treated at 10 to 300° C. for 1 to 5 hours to obtain a CC substrate and cut it into small pieces of 1*1 cm.

8. The method for preparing the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 1, characterized in that: The molecular weight of the polybenzoquinone is in the range of 3000 to 6000.

9. A Bi2SiO5 / carbon foam composite photoelectrocatalytic material prepared by the method according to any one of claims 1 to 8.

10. Use of the Bi2SiO5 / carbon foam composite photoelectrocatalytic material according to claim 9 as an anode material in the process of photoelectrocatalytic water decomposition.

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