CN-122010054-A - Application of ZIS/PDA photocatalytic material with photo-thermal synergistic effect

Abstract

The invention discloses an application of a Zn 2 In 2 S 5 /PDA photocatalysis material with a photo-thermal synergistic effect, belonging to the technical field of photocatalysis composite materials and hydrogen peroxide (H 2 O 2 ) production. The Zn 2 In 2 S 5 /PDA photocatalysis material is used for producing H 2 O 2 by photocatalysis, and the catalysis rate can reach 9180 mu M.h ‑1 ·g ‑1 . The material is prepared by an in-situ polymerization method, zn 2 In 2 S 5 nanoflower is first hydrothermally synthesized, and then dopamine hydrochloride is added into a weakly alkaline solution containing Zn 2 In 2 S 5 to carry out in-situ self-polymerization, so that a Zn 2 In 2 S 5 composite material modified by PDA is obtained. The p-n heterojunction is successfully constructed, the photo-response range is widened to the full spectrum by introducing the PDA, the photo-thermal effect is utilized to improve the microscopic temperature of the surface of the catalyst, the separation and transmission of photo-generated carriers are effectively promoted, and the oxygen adsorption capacity is optimized. Compared with pure Zn 2 In 2 S 5 , the composite material of the invention has obviously improved photocatalytic H 2 O 2 production performance, simple preparation process and stable structure, and provides a new way for efficiently producing H 2 O 2 .

Inventors

• GAO ZHI
• Lei Wanying

Assignees

• 高智

Dates

Publication Date

20260512

Application Date

20260324

Claims (10)

1. 1. The application of the Zn 2 In 2 S 5 /PDA photocatalysis material with the photo-thermal synergistic effect is characterized in that the Zn 2 In 2 S 5 /PDA composite material is used as a photocatalyst to be applied to photocatalysis production of hydrogen peroxide (H 2 O 2 ), and the catalysis rate of the photocatalysis material in the photocatalysis production process of H 2 O 2 reaches more than 9180 mu M.h -1 ·g -1 .
2. 2. The use according to claim 1, wherein the Zn 2 In 2 S 5 /PDA composite is prepared by a process comprising the steps of: A. Mixing a zinc source, an indium source and a sulfur source, and performing a hydrothermal reaction to obtain a Zn 2 In 2 S 5 nano material; B. Dispersing the Zn 2 In 2 S 5 nano material obtained in the step A in a solvent, regulating the pH to be alkaline, adding dopamine hydrochloride, carrying out in-situ polymerization reaction, carrying out solid-liquid separation, and drying to obtain the Zn 2 In 2 S 5 /PDA composite material.
3. 3. The use according to claim 2, wherein in step a the zinc source is ZnCl 2 , the indium source is InCl 3 , the sulfur source is Thioacetamide (TAA), and the molar ratio of ZnCl 2 、InCl 3 to TAA is 2:2:5.
4. 4. Use according to claim 2 or 3, wherein the temperature of the hydrothermal reaction in step a is 150-170 ℃ for 10-14 hours, preferably 160 ℃ for 12 hours.
5. 5. The use according to claim 2, wherein in step B the pH is adjusted to a value of 8.0-9.0, preferably to a value of 8.5 using ammonia.
6. 6. The use according to claim 2 or 5, wherein the mass ratio of Zn 2 In 2 S 5 nanomaterial to the dopamine or salt thereof in step B is 1:0.1 to 1:0.4.
7. 7. The use according to claim 6, wherein the mass ratio of Zn 2 In 2 S 5 nanomaterial to dopamine or salt thereof in step B is 1:0.3.
8. 8. The use according to claim 2, wherein the in situ polymerization reaction in step B is carried out at room temperature for a period of 20-28 hours, preferably for a period of 24 hours.
9. 9. The use according to any one of claims 1 to 8, wherein in the Zn 2 In 2 S 5 /PDA composite, polydopamine (PDA) is supported on Zn 2 In 2 S 5 nanoflower surface in a bulk island distribution, forming a p-n heterojunction.
10. 10. The use according to any one of claims 1 to 9, wherein the Zn 2 In 2 S 5 /PDA composite material has a surface temperature that is increased by more than 30 ℃ under full spectrum illumination compared to pure Zn 2 In 2 S 5 , and the light absorption range extends from the ultraviolet region to the visible and near infrared region.

Description

Application of ZIS/PDA photocatalytic material with photo-thermal synergistic effect Technical Field The invention relates to the technical field of hydrogen peroxide production, in particular to application of a Zn 2In2S5/PDA photocatalytic material with a photo-thermal synergistic effect. Background Hydrogen peroxide (H 2O2) is widely used in various industrial and medical fields as a green oxidizing agent and a clean liquid fuel. H 2O2 is prepared by utilizing a plurality of methods such as an anthraquinone method, an H 2O2 catalytic combination method, an electrocatalytic O 2 reduction method, an electrocatalytic oxidation H 2O2 and the like. However, these methods often face limitations that prevent their practical application. For example, anthraquinone process is complex, cumbersome to operate, and there is a risk of organic leakage and serious environmental pollution. H 2O2 has low catalytic combining efficiency and potential explosion hazard, and causes safety concerns. Electrocatalytic synthesis requires additional electrical energy to drive the reaction, which increases overall energy consumption and cost. Therefore, the energy-saving and environment-friendly H 2O2 production technology is increasingly required to be explored to meet different utilization requirements. Photocatalytic technology has become a promising process for the production of H 2O2. The process utilizes solar energy to synthesize H 2O2 from abundant resources such as H 2 O, O 2 and the like, provides a sustainable and green method, and provides mild reaction conditions by taking sunlight as an energy source in the process, and has the advantages of simple and controllable operation and no secondary pollution unlike the other methods. Therefore, the selection of the photocatalyst becomes a key element in the photocatalysis technology. Among them, zn 2In2S5 is widely used in the field of photocatalysis due to its advantageous electronic properties, band gap and band edge, tunable optical properties. For a long time, photocatalysis and thermocatalysis are two mutually independent systems, and the photocatalysis can simultaneously exert the advantages of heat and photocatalysis, and the photocatalysis has good catalytic activity under mild conditions, can accelerate the transmission of photo-generated charges and accelerate the diffusion of products in the reaction process. The light can trigger chemical reaction in the photo-thermal catalysis process, heat is gathered on the surface of the material, the input of heat is reduced, and in the reaction process, the reaction is accelerated by the heat, so that the mobility of photo-generated carriers or the selectivity of reaction products is increased. However, the development of Zn 2In2S5 in practical photocatalytic applications is still limited due to the narrow photoresponse range and the easy recombination of photogenerated carriers. Polydopamine (PDA) is used as an organic photo-thermal material, has strong light absorption capacity in the full-wavelength spectrum range, and can be used as a p-type semiconductor to construct a p-n junction with Zn 2In2S5 to promote the spatial separation of carriers. Therefore, development of a Zn 2In2S5/PDA photocatalytic material with a photo-thermal effect for efficient synthesis of H 2O2 has important application value. Disclosure of Invention Aiming at the problems existing in the prior art, the invention provides an application of ZIS/PDA photocatalytic material. The Zn 2In2S5/PDA composite material prepared by the method has the advantages of strong photocatalytic activity and good stability, and has wide application prospect in the field of hydrogen peroxide production. The technical scheme of the invention is as follows: an application of ZIS/PDA photocatalysis material is used for producing H 2O2 by photocatalysis, and the photocatalysis material has a catalysis rate of 9180 mu M ∙ H -1∙g-1 in the catalysis process; The ZIS/PDA photocatalytic material is a Zn 2In2S5/PDA composite material, and the preparation method comprises the following steps: A. ZnCl 2、InCl3 and TAA are dissolved in the mixed solution of deionized water and ethanol at room temperature. The mixed solution was then transferred to a polytetrafluoroethylene liner for hydrothermal reaction. Finally washing three times by deionized water and drying by a vacuum drying oven to obtain the Zn 2In2S5 nanoflower. B. Firstly, preparing a mixed solution of deionized water and ethanol, wherein the volume ratio is 1:1. Weighing Zn 2In2S5 with a certain mass, adding the Zn 2In2S5 into the mixed solution, and carrying out ultrasonic treatment until the Zn 2In2S5 is dispersed. Ammonia was then added to the mixed solution so that the solution ph=8.5. The dopamine hydrochloride with different mass is weighed and added into the solution and stirred. Finally washing three times by deionized water and drying by a vacuum drying oven to obtain the Zn 2In2S5/PDA nano-particles. As a further