Photocatalysts based on longitudinal-transverse double Seebeck effect thermoelectric matrix, their preparation methods and applications

Abstract

This invention provides a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix, its preparation method, and its application. The photocatalyst comprises a thermoelectric matrix and a TiO2-In2O3@g-C3N4 ternary composite photocatalyst supported on the surface of the thermoelectric matrix. The thermoelectric matrix is ​​made of highly textured Bi2Te. 2.7 Se 0.3 This invention utilizes spin-coating of photocatalytic materials onto a substrate with a transverse thermoelectric effect, eliminating the need for additional devices. The dual thermoelectric field effect inherent in the substrate itself significantly optimizes the catalyst's performance. Furthermore, the heterojunction formed by TiO2, In2O3, and g-C3N4 effectively regulates the transport of photogenerated carriers through its built-in electric field.

Description

Technical Field

[0001] This invention belongs to the field of thermoelectric materials application, and relates to a highly textured photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix that can enhance photocatalytic effect, its preparation method and application. Background Technology

[0002] Photocatalysis technology has developed into a relatively complete and mature system, involving research from multiple disciplines such as catalytic chemistry, photoelectrochemistry, semiconductor physics, materials science, and environmental science. Significant progress has also been made in the design and control of catalytic materials, with a large number of excellent semiconductor photocatalysts emerging and various engineering strategies continuously evolving. While these innovative achievements have made significant contributions to building efficient photocatalytic systems, some challenges remain in improving photocatalytic efficiency. For example, the ability of unconventional photocatalytic materials to generate and transfer photoinduced charge carriers is limited by their inherent properties. Therefore, it is necessary to find new external driving sources to promote efficient carrier separation, improve charge transport, and enhance the overall catalytic performance of photocatalysis.

[0003] Chinese patent application CN114749169A enhances the degradation ability of photocatalysts by loading photocatalysts onto thermoelectric rods; Chinese patent application CN116550381A loads thermoelectric materials and photocatalysts onto a ciliary array substrate using a magnetic field-induced self-assembly method to enhance the degradation ability of the catalyst. However, the above technologies have complex preparation processes and require additional magnetic fields to achieve the desired improvement in photocatalytic performance. Therefore, exploring an external field-assisted photocatalysis technology with a simple preparation process that does not require the introduction of additional energy will directly or indirectly change the research in the field of photocatalysis, building upon existing redox reactions. Summary of the Invention

[0004] To fill the gap in the field of enhanced photocatalysis without externally applied field strength, the present invention aims to provide a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix, its preparation method, and its application.

[0005] This invention is achieved through the following technical solution:

[0006] A photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix includes a thermoelectric matrix and a TiO2-In2O3@g-C3N4 ternary composite photocatalyst supported on the surface of the thermoelectric matrix. The thermoelectric matrix is ​​made of highly textured Bi2Te. 2.7 Se 0.3 .

[0007] Preferably, the loading of the TiO2-In2O3@g-C3N4 ternary composite photocatalyst on the thermoelectric substrate is 10-20 mg / cm³. 2.

[0008] The method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to the present invention includes the following steps:

[0009] S1, using TeO2, BiCl3, and NaSeO3 as raw materials, is added to a solvent and subjected to a solvothermal reaction to obtain Bi2Te. 2.7 Se 0.3 Thermoelectric powder; Bi2Te 2.7 Se 0.3 Thermoelectric powder is subjected to spark plasma sintering to obtain a thermoelectric matrix;

[0010] S2, g-C3N4 powder was added to ethanol, ultrasonically dispersed, tetrabutyl titanate and indium nitrate were added, and a solvothermal reaction was carried out to obtain TiO2-In2O3@g-C3N4 ternary composite photocatalyst;

[0011] S3, TiO2-In2O3@g-C3N4 and conductive binder are mixed in ethanol to obtain a catalyst emulsion; the catalyst emulsion is coated on a thermoelectric substrate, and after standing and drying, a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric substrate is obtained.

[0012] Preferably, in S1, the temperature of the solvothermal reaction is 180~200℃ and the time is 24~36 h.

[0013] Preferably, in S1, the temperature of the spark plasma sintering is 380~410℃, the pressure is 45~50 MPa, and the time is 8~10 min.

[0014] Preferably, in S2, the ratio of g-C3N4, tetrabutyl titanate and indium nitrate is 0.5 g:(0.2~0.4) mL:(0.5~1) mmoL.

[0015] Preferably, in S2, the temperature of the solvothermal reaction is 150~200℃ and the time is 10~15h.

[0016] Preferably, in S3, the conductive adhesive is PEDOT:PSS.

[0017] The present invention also provides the application of the photocatalyst based on the longitudinal-transverse double Seebeck effect thermoelectric matrix in the photocatalytic degradation of organic pollutants.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention relates to a photocatalyst based on a longitudinal-transverse dual Seebeck effect thermoelectric matrix. A TiO2-In2O3@g-C3N4 ternary composite photocatalyst is coated onto the surface of a highly textured thermoelectric matrix, forming a photocatalyst coating. Compared to low-orientation thermoelectric materials with traditional thermoelectric effects, the highly textured thermoelectric material possesses a combined longitudinal and transverse thermoelectric field effect. Its introduction provides the photocatalyst with a strong, self-supplied dual thermoelectric field based on environmental waste heat. This allows charge carriers within the thermoelectric matrix to move directionally according to the Seebeck effect. The longitudinally moving charge carriers provide additional charge carrier support for the redox reaction of the photocatalyst. Furthermore, the transversely transported charge carriers provide a vertical external electric field to the catalyst, improving the separation efficiency of photogenerated charge carriers, further extending the lifetime of photogenerated charge carriers, and reducing their recombination rate. Therefore, this invention, by spin-coating a photocatalyst material onto a matrix with a transverse thermoelectric effect, eliminates the need for additional devices, as the dual thermoelectric field effect inherent in the matrix itself can significantly optimize the catalytic performance. In addition, TiO2, In2O3 and g-C3N4 form a heterojunction, and the built-in electric field effectively regulates the transport of photogenerated carriers. In summary, this invention can expand the results of catalyst redox reactions, improve the utilization efficiency in wastewater degradation, carbon dioxide reduction and other aspects, and meet the green and environmentally friendly development needs of the energy industry.

[0020] This invention relates to a method for preparing photocatalysts based on a longitudinal-transverse double Seebeck effect thermoelectric matrix. The process is simple and pollution-free.

[0021] When photocatalysis is performed using the photocatalyst based on the longitudinal-transverse double Seebeck effect thermoelectric matrix of this invention, under illumination, the upper surface of the highly textured thermoelectric matrix with the transverse-longitudinal composite double thermoelectric field effect absorbs heat, resulting in a temperature difference with the lower surface. This generates a transverse-longitudinal double thermoelectric field, which achieves the effect of controlling the separation of photogenerated carriers on the catalyst surface. No external field strength is required, which meets the green and environmentally friendly development needs of the energy industry. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 Bi2Te prepared in Example 1 2.7 Se 0.3 X-ray diffraction patterns of powder and bulk materials;

[0024] Figure 2 Bi2Te prepared in Example 12.7 Se 0.3 Microscopic images of the surface and cross-section of the block under a scanning electron microscope;

[0025] Figure 3 A magnified 13 kSEM image of TiO2-In2O3@g-C3N4 prepared in Example 1 under a field emission scanning electron microscope;

[0026] Figure 4 The EDS spectrum of the TiO2-In2O3@g-C3N4 ternary composite photocatalyst prepared in Example 1 is shown below.

[0027] Figure 5 The thermoelectric matrix Bi2Te prepared in Example 1 2.7 Se 0.3 And physical images of TiO2-In2O3@g-C3N4 loaded on glass substrates;

[0028] Figure 6 The thermoelectric matrix Bi2Te prepared in Example 1 2.7 Se 0.3 And a schematic diagram of the apparatus for photocatalytic reaction of TiO2-In2O3@g-C3N4 loaded on glass control substrates;

[0029] Figure 7 The thermoelectric matrix Bi2Te obtained in Example 1 2.7 Se 0.3 The degradation curves of TiO2-In2O3@g-C3N4 loaded on glass substrates after photocatalytic reaction in RhB solution. Detailed Implementation

[0030] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention.

[0031] It should be noted that the process equipment or apparatus not specifically mentioned in the following embodiments are all conventional equipment or apparatus in the art.

[0032] It should be noted that the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products, or apparatuses. Furthermore, unless otherwise stated, the numbering of each method step is merely a convenient tool for identifying each method step, and not intended to limit the order of the method steps or define the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0033] The photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix of the present invention comprises a thermoelectric matrix and a TiO2-In2O3@g-C3N4 ternary composite photocatalyst supported on the surface of the thermoelectric matrix. The thermoelectric matrix is ​​made of highly textured Bi2Te. 2.7 Se 0.3 .

[0034] In this invention, the preferred loading amount of the TiO2-In2O3@g-C3N4 ternary composite photocatalyst on the thermoelectric substrate is 10~20 mg / cm³. 2 Preferably 15 mg / cm 2 .

[0035] This invention involves coating a TiO2-In2O3@g-C3N4 ternary composite photocatalyst onto a Bi2Te substrate. 2.7 Se 0.3 A photocatalyst coating is formed on the surface of the thermoelectric substrate. (Bi2Te) 2.7 Se 0.3 This invention possesses the advantages of thinner and larger microlayers in its microstructure. After plasma spark sintering, its powder exhibits a high degree of texturing, resulting in a dual thermoelectric field effect with both longitudinal and transverse properties, compared to traditional thermoelectric materials with low orientation. The introduction of this dual thermoelectric matrix provides a powerful, self-supplied dual thermoelectric field based on environmental waste heat, allowing carriers within the thermoelectric matrix to move directionally according to the Seebeck effect. The longitudinally moving carriers provide additional carrier support for the redox reaction of the photocatalyst, while the transversely transported carriers provide a vertical external electric field, improving the separation efficiency of photogenerated carriers, further extending their lifetime, and reducing their recombination rate. Furthermore, compared to a single catalyst, the heterojunction formed by the combination of TiO2, In2O3, and g-C3N4 effectively regulates the transport of photogenerated carriers through its built-in electric field. All these factors enhance the catalytic performance of the catalyst, resulting in a superior improvement compared to existing thermoelectrically enhanced photocatalytic devices.

[0036] The present invention discloses a method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix, comprising the following steps:

[0037] S1, using TeO2, BiCl3, and NaSeO3 as raw materials, is added to a solvent and subjected to a solvothermal reaction to obtain Bi2Te. 2.7 Se 0.3 Thermoelectric powder; Bi2Te 2.7 Se 0.3 Thermoelectric powder is subjected to spark plasma sintering to obtain a thermoelectric matrix;

[0038] S2, g-C3N4 powder was added to ethanol, ultrasonically dispersed, tetrabutyl titanate and indium nitrate were added, and a solvothermal reaction was carried out to obtain TiO2-In2O3@g-C3N4 ternary composite photocatalyst;

[0039] S3, TiO2-In2O3@g-C3N4 and conductive binder are mixed in ethanol to obtain a catalyst emulsion; the catalyst emulsion is coated on a thermoelectric substrate, and after standing and drying, a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric substrate is obtained.

[0040] In the preparation method of the photocatalyst based on the longitudinal-transverse double Seebeck effect thermoelectric matrix described in this invention, the Bi2Te can be controlled by changing the temperature and time of the solvothermal reaction. 2.7 Se 0.3 The size of the nanosheets can be controlled by altering the sintering temperature, pressure, and mold diameter during spark plasma sintering to regulate Bi2Te. 2.7 Se 0.3 The degree of densification and texturing is determined. Specifically, the solvothermal reaction temperature is 180~200℃, and the time is 24~36 h. The spark plasma sintering temperature is 380~410℃, the pressure is 45~50 MPa, and the time is 8~10 min. The mold diameters used are 12 mm and 20 mm.

[0041] In the preparation method of the photocatalyst based on the longitudinal-transverse double Seebeck effect thermoelectric matrix described in this invention, the catalytic effect of the ternary composite photocatalyst can be adjusted by changing the molar ratio of g-C3N4, tetrabutyl titanate, and indium nitrate. Specifically, the ratio of g-C3N4, tetrabutyl titanate, and indium nitrate is 0.5 g:(0.2~0.4) mL:(0.5~1) mmol / L.

[0042] In step S2 of the method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to the present invention, the temperature of the solvothermal reaction is 150~200℃ and the time is 10~15h.

[0043] In step S3 of the method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to the present invention, the conductive binder is PEDOT:PSS, and the volume ratio of PEDOT:PSS to ethanol is 1:(40~50).

[0044] In step S3 of the preparation method of the photocatalyst based on the longitudinal-transverse double Seebeck effect thermoelectric matrix of the present invention, the coating is specifically performed by spin coating machine, with a pre-rotation speed of 700~1000 r / min and a forward rotation speed of 1500~2000 r / min.

[0045] The photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix described in this invention can be used as a photocatalyst material in the photocatalytic degradation of organic pollutants. Compared with other external field-enhanced photocatalytic effects, this invention does not require the introduction of additional electric or magnetic field devices. The thermoelectric matrix, as the photocatalyst matrix, can establish a temperature difference between its upper and lower surfaces using waste heat from the environment, thereby generating a thermoelectric field. This field regulates the separation of photogenerated carriers on the surface of the thermoelectric matrix photocatalyst, achieving a self-powered, assisted enhancement of the photocatalyst effect.

[0046] Example 1

[0047] A method for preparing a highly textured photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix that can enhance photocatalytic effects includes the following steps:

[0048] 1) Preparation of highly textured thermoelectric substrates

[0049] Using TeO2, BiCl3, and NaSeO3 as raw materials, a solvothermal reaction was carried out in ethylene glycol at 180°C for 24 h to obtain Bi2Te 2.7 Se 0.3 Thermoelectric powder; Bi2Te is sintered using spark plasma sintering (SPS) technology. 2.7 Se 0.3 Thermoelectric powder was sintered at 380℃ and 45 MPa for 8 min to prepare a bulk thermoelectric matrix with a diameter of 20 mm.

[0050] 2) Preparation of TiO2-In2O3@g-C3N4 ternary composite photocatalyst

[0051] 20 g of urea was dissolved in 20 mL of deionized water at 50 °C and heated in a muffle furnace at 550 °C for 4 h to obtain g-C3N4. After washing with water and alcohol, the powder was dried in an oven at 60 °C for 24 h to obtain bright yellow graphitic C3N4 powder. 0.5 g of graphitic C3N4 powder was taken and ultrasonically dispersed in 40 mL of ethanol for 30 min. Ti source and In source were introduced by adding 0.2 mL of tetrabutyl titanate and 0.5 mmol of indium nitrate. After hydrothermal reaction at 180 °C for 12 h, the powder was centrifuged, washed with water and alcohol, and dried to obtain TiO2-In2O3@g-C3N4 ternary composite photocatalyst powder.

[0052] 3) Preparation of photocatalysts based on longitudinal-transverse double Seebeck effect thermoelectric matrix

[0053] PEDOT:PSS was selected as the conductive binder between the thermoelectric matrix and the photocatalyst. TiO2-In2O3@g-C3N4 was placed in a mixed solution of PEDOT:PSS and ethanol (PEDOT:PSS to ethanol volume ratio 1:40) and pulverized in a cell disruptor for 6 hours to obtain a uniformly dispersed catalyst emulsion. The spin coater was set with a pre-speed of 1000 r / min and a forward speed of 2000 r / min, and the catalyst emulsion was uniformly coated onto Bi2Te using a spin coating process. 2.7 Se 0.3 A photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix was obtained after being left to stand and dry for 5 h on the thermoelectric matrix.

[0054] Example 2

[0055] 1) Preparation of highly textured thermoelectric substrates

[0056] Bi was obtained by solvothermal reaction of TeO2, BiCl3, and NaSeO3 in ethylene glycol at 190°C for 30 h. 0.5 Sb 1.5 Te3 thermoelectric powder, using spark plasma sintering (SPS) technology, is used to bond Bi2Te 2.7 Se 0.3 Thermoelectric powder was sintered at 390℃ and 47 MPa for 8 min to prepare a thermoelectric block with a diameter of 20 mm.

[0057] 2) Preparation of TiO2-In2O3@g-C3N4 ternary composite photocatalyst

[0058] 20 g of urea was dissolved in 20 mL of deionized water at 50 °C and heated in a muffle furnace at 550 °C for 4 h to obtain g-C3N4. After washing with water and alcohol, the powder was dried in an oven at 60 °C for 24 h to obtain bright yellow graphitic C3N4 powder. 0.5 g of graphitic C3N4 powder was taken and 40 mL of ethanol was added for ultrasonic dispersion for 30 min. Then, Ti source and In source were introduced by adding 0.3 mL of tetrabutyl titanate and 0.7 mmol / L of indium nitrate. After hydrothermal reaction at 180 °C for 12 h, the powder was centrifuged, washed with water and alcohol, and dried to obtain TiO2-In2O3@g-C3N4 ternary composite photocatalyst powder.

[0059] 3) Preparation of photocatalysts based on longitudinal-transverse double Seebeck effect thermoelectric matrix

[0060] PEDOT:PSS was selected as the conductive binder between the thermoelectric matrix and the photocatalyst. TiO2-In2O3@g-C3N4 was placed in a mixed solution of PEDOT:PSS and ethanol (PEDOT:PSS to ethanol volume ratio 1:44), and pulverized in a cell disruptor for 3 hours to obtain a uniformly dispersed emulsion of the catalyst. The spin coater was set with a pre-speed of 700 r / min and a forward speed of 1500 r / min, and the catalyst emulsion was uniformly coated onto Bi2Te using a spin coating process. 2.7 Se 0.3 A photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix was obtained by allowing the substrate to stand and dry for 5 h.

[0061] Example 3

[0062] 1) Preparation of highly textured thermoelectric substrates

[0063] Bi₂Te was obtained by solvothermal reaction of TeO₂, BiCl₃, and NaSeO₃ in ethylene glycol at 195 °C for 33 h. 2.7 Se 0.3 Thermoelectric powder, using spark plasma sintering (SPS) technology, incorporates Bi2Te... 2.7 Se 0.3 Thermoelectric powder was sintered at 400℃ and 49 MPa for 8 min to prepare a thermoelectric block with a diameter of 20 mm.

[0064] 2) Preparation of TiO2-In2O3@g-C3N4 ternary composite photocatalyst

[0065] 20g of urea was dissolved in 20 mL of deionized water at 50℃, and heated in a muffle furnace at 550℃ for 4 h to obtain g-C3N4. After washing with water and alcohol, it was dried in an oven at 60℃ for 24 h to obtain bright yellow graphitic C3N4 powder. 0.5 g of graphitic C3N4 powder was taken, and 40 mL of ethanol was added and ultrasonically dispersed for 30 min. Then, 0.35 mL of tetrabutyl titanate and 0.8 mmol of indium nitrate were added to introduce Ti and In sources. After hydrothermal reaction at 180℃ for 12 h, it was centrifuged, washed with water and alcohol, and dried to obtain TiO2-In2O3@g-C3N4 ternary composite photocatalyst powder.

[0066] 3) Preparation of photocatalysts based on longitudinal-transverse double Seebeck effect thermoelectric matrix

[0067] PEDOT:PSS was selected as the conductive binder between the thermoelectric matrix and the photocatalyst. TiO2-In2O3@g-C3N4 was placed in a mixed solution of PEDOT:PSS and ethanol (PEDOT:PSS to ethanol volume ratio 1:48), and pulverized in a cell disruptor for 4 hours to obtain a uniformly dispersed emulsion of the catalyst. The spin coater was set with a pre-speed of 800 r / min and a forward speed of 1700 r / min, and the catalyst emulsion was uniformly coated onto Bi2Te using a spin coating process. 2.7 Se 0.3 A ternary photocatalyst supported on a thermoelectric substrate was obtained after being left to stand and dry for 5 hours.

[0068] Example 4

[0069] 1) Preparation of highly textured thermoelectric substrates

[0070] Bi₂Te was obtained by solvothermal reaction of TeO₂, BiCl₃, and NaSeO₃ in ethylene glycol at 200°C for 36 h. 2.7 Se 0.3 Thermoelectric powder, using spark plasma sintering (SPS) technology, incorporates Bi2Te... 2.7 Se 0.3 Thermoelectric powder was sintered at 410℃ and 50 MPa for 8 min to prepare a bulk thermoelectric matrix with a diameter of 20 mm.

[0071] 2) Preparation of TiO2-In2O3@g-C3N4 ternary composite photocatalyst

[0072] 20g of urea was dissolved in 20mL of deionized water at 50℃ and heated in a muffle furnace at 550℃ for 4h to obtain g-C3N4. After washing with water and alcohol, the powder was dried in an oven at 60℃ for 24h to obtain bright yellow graphitic C3N4 powder. 0.5g of graphitic C3N4 powder was taken and 40mL of ethanol was added for ultrasonic dispersion for 30min. Then, 0.4mL of tetrabutyl titanate and 1 mmol of indium nitrate were added to introduce Ti and In sources. After hydrothermal reaction at 180℃ for 12h, the powder was centrifuged, washed with water and alcohol, and dried to obtain TiO2-In2O3@g-C3N4 ternary composite photocatalyst powder.

[0073] 3) Preparation of photocatalysts based on longitudinal-transverse double Seebeck effect thermoelectric matrix

[0074] PEDOT:PSS was selected as the conductive binder between the thermoelectric matrix and the photocatalyst. TiO2-In2O3@g-C3N4 was placed in a mixed solution of PEDOT:PSS and ethanol (PEDOT:PSS to ethanol volume ratio 1:50), and pulverized in a cell disruptor for 5 hours to obtain a uniformly dispersed emulsion of the catalyst. The spin coater was set with a pre-speed of 900 r / min and a forward speed of 1800 r / min, and the catalyst emulsion was uniformly coated onto Bi2Te using a spin coating process. 2.7 Se 0.3 A photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix was obtained by allowing the substrate to stand and dry for 5 h.

[0075] X-ray diffraction of the thermoelectric powder and the bulk material after spark plasma sintering obtained in Example 1 of this invention are as follows: Figure 1 As shown, the diffraction peaks conform to the bismuth telluride PDF card, and the orientation along (001) is enhanced in the bulk material after heating and pressurizing sintering. (Bi2Te) 2.7 Se 0.3 Cross-sectional SEM image of the thermoelectric substrate as shown Figure 2 As shown, its layered structure is obvious and its texture is highly refined.

[0076] Figure 3 This is a SEM image of the TiO2-In2O3@g-C3N4 ternary composite photocatalyst with photocatalytic effect obtained in Example 1. As can be seen from the image, its microstructure is loose and porous. Figure 4 The EDS spectrum shows that TiO2 and In2O3 particles were successfully composited on the surface of g-C3N4 and the elements were evenly distributed.

[0077] Samples of photocatalysts with enhanced photocatalytic effects based on longitudinal-transverse double Seebeck effect thermoelectric substrates, such as... Figure 5As shown, the TiO2-In2O3@g-C3N4 ternary composite photocatalyst is uniformly loaded on a glass substrate (a) and a thermoelectric substrate (b).

[0078] Figure 6 The diagram shows the photocatalytic degradation reaction of Rhodamine B by the photocatalyst with enhanced photocatalytic effect based on a longitudinal-transverse double Seebeck effect thermoelectric matrix obtained in Example 1, and the test device. Figure 7 The photocatalytic degradation curves (a) and kinetic curves (b) of Rhodamine B obtained in Example 1 are based on a longitudinal-transverse double Seebeck effect thermoelectric matrix and a glass matrix-supported photocatalyst composite material. It can be seen that compared with the 19% degradation rate of the photocatalyst supported on the glass control matrix, the degradation rate of RhB by the TiO2-In2O3@g-C3N4 ternary composite photocatalyst supported on the thermoelectric matrix reached 32% after 60 min. This shows that the thermoelectric matrix effectively improves the catalytic performance of the photocatalyst.

[0079] In summary, the method for preparing a highly textured photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix of the present invention provides a photocatalyst with enhanced photocatalytic effect. Its catalytic performance is superior to that of a photocatalyst supported on a matrix without thermoelectric effect. Moreover, compared with other external field-assisted photocatalysis, the thermoelectric matrix in this invention can generate an electric field through ambient temperature to achieve the effect of assisted photocatalysis without the need for external field strength, thus meeting the green and environmentally friendly development needs of the energy industry.

Claims

1. A photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix, characterized in that, It includes a thermoelectric substrate and a TiO2-In2O3@g-C3N4 ternary composite photocatalyst supported on the surface of the thermoelectric substrate, wherein the thermoelectric substrate is made of highly textured Bi2Te 2.7 Se 0.3 .

2. The photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to claim 1, characterized in that, The loading of the TiO2-In2O3@g-C3N4 ternary composite photocatalyst on the thermoelectric substrate was 10~20 mg / cm³. 2 .

3. The method for preparing the photocatalyst based on the longitudinal-transverse double Seebeck effect thermoelectric matrix as described in claim 1 or 2, characterized in that, Includes the following steps: S1, using TeO2, BiCl3, and NaSeO3 as raw materials, is added to a solvent and subjected to a solvothermal reaction to obtain Bi2Te. 2.7 Se 0.3 Thermoelectric powder; Bi2Te 2.7 Se 0.3 Thermoelectric powder is subjected to spark plasma sintering to obtain a thermoelectric matrix; S2, g-C3N4 powder was added to ethanol, ultrasonically dispersed, tetrabutyl titanate and indium nitrate were added, and a solvothermal reaction was carried out to obtain TiO2-In2O3@g-C3N4 ternary composite photocatalyst; S3, TiO2-In2O3@g-C3N4 and conductive binder are mixed in ethanol to obtain a catalyst emulsion; the catalyst emulsion is coated on a thermoelectric substrate, and after standing and drying, a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric substrate is obtained.

4. The method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to claim 3, characterized in that, In S1, the temperature of the solvothermal reaction is 180~200℃ and the time is 24~36 h.

5. The method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to claim 3, characterized in that, In S1, the temperature of the spark plasma sintering is 380~410℃, the pressure is 45~50 MPa, and the time is 8~10 min.

6. The method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to claim 3, characterized in that, In S2, the ratio of g-C3N4, tetrabutyl titanate and indium nitrate is: 0.5 g:(0.2~0.4) mL:(0.5~1) mmol / L.

7. The method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to claim 3, characterized in that, In S2, the temperature of the solvothermal reaction is 150~200℃ and the time is 10~15h.

8. The method for preparing a photocatalyst based on a longitudinal-transverse double Seebeck effect thermoelectric matrix according to claim 3, characterized in that, In S3, the conductive adhesive is PEDOT:PSS.

9. The application of the photocatalyst based on the longitudinal-transverse double Seebeck effect thermoelectric matrix as described in claim 1 or 2 in the photocatalytic degradation of organic pollutants.

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