Te / ZnIn2S4 composite photocatalyst for H2O2 production and preparation method thereof

Abstract

The invention relates to a Te / ZnIn2S4 composite photocatalyst for H2O2 production and a preparation method of the Te / ZnIn2S4 composite photocatalyst, and the preparation method comprises the following steps: adding tellurium nanowires into ionized water and glycerol, and ultrasonically mixing uniformly; adding zinc chloride, indium chloride and thioacetamide, and fully and uniformly mixing; and heating the mixed solution in an oil bath, centrifuging and drying to obtain the Te / ZnIn2S4 composite photocatalyst. The prepared Te / ZnIn2S4 composite photocatalyst is excellent in performance and good in cycling stability. The medicines used for preparation are easy to obtain and low in price, the preparation is simple, and the used time is short. The prepared Te / ZnIn2S4 composite photocatalyst can be successfully applied to the fields of photocatalytic H2O2 production and the like.

Description

Technical Field

[0001] The invention belongs to the technical field of nano material preparation, and specifically relates to a Te / ZnIn2S4 composite photocatalyst used for producing H2O2 and a preparation method thereof. Background Art

[0002] Hydrogen peroxide (H2O2) is a valuable high-energy resource with extensive applications in chemical manufacturing, healthcare, and environmental remediation as an environmentally friendly oxidant and efficient energy carrier. H2O2 has attracted much attention due to its wide range of applications, which has prompted in-depth research on efficient and low-cost production methods. Currently, industrial production of H2O2 mainly relies on the anthraquinone method, which has problems such as high energy consumption, large environmental impact, and excessive by-product generation. The research on photosynthesis of H2O2 via the two-electron oxygen reduction reaction has attracted widespread attention due to its high energy efficiency and environmentally friendly on-site synthesis potential. Currently, a variety of semiconductor materials, such as g-C3N4, CoSe2, and In2S3, have been widely studied for the photocatalytic synthesis of H2O2. However, this process is still limited by low yield and dependence on external sacrificial reagents. The main challenges in the development of photocatalysts are their limited response to visible light, low carrier separation efficiency, and high impedance of surface oxygen reactions. Therefore, designing an efficient, safe, economical, and environmentally friendly method for H2O2 production is crucial to meet the growing industrial needs.

[0003] ZnIn2S4 (ZIS) is considered to be an effective photocatalyst with a wide range of applications in various fields, including hydrogen production, CO2 reduction, and organic pollutant degradation, due to its abundant active sites, suitable band structure, and narrow band gap. However, similar to many metal sulfides, ZIS also acts as a decomposition co-catalyst, which has an adverse effect on the accumulation of H2O2. Severe surface photocorrosion and rapid electron-hole recombination significantly reduce the photocatalytic performance of ZIS in the absence of sacrificial reagents. Therefore, the rational selection of semiconductor materials to construct heterojunctions is an effective strategy to enhance electron separation while maintaining a strong redox potential, providing sufficient driving force for oxygen reduction reaction and water oxidation.

[0004] The methods reported so far for preparing ZIS-based composite materials still have the disadvantages of complex preparation process and high cost, which are not conducive to their practical application. In addition, in order to utilize the maximum redox potential of ZIS, it is necessary to select suitable semiconductor materials to couple with it and prepare composite catalysts with high-efficiency photocatalytic performance through simple preparation methods. Summary of the invention

[0005] In order to avoid the deficiencies of the prior art, the present invention provides a Te / ZnIn2S4 composite photocatalyst for producing H2O2 and a preparation method thereof.

[0006] One of the objects of the present invention is to provide a semiconductor material with suitable energy band.

[0007] The second object of the present invention is to provide a simple and easy one-step oil bath method.

[0008] The third object of the present invention is to provide a Te / ZnIn2S4 composite photocatalyst for producing H2O2.

[0009] The Te / ZnIn2S4 composite photocatalyst for H2O2 production prepared by the present invention is prepared by a one-step oil bath method using tellurium nanowires, zinc chloride, indium chloride, and thioacetamide as raw materials. The preparation process includes the following specific steps: First, add 10-50 mg of tellurium nanowires to 20 mL of deionized water and 3 mL of glycerol, and mix thoroughly by ultrasonication for 10-30 minutes; Then, add 0.01-0.1g zinc chloride, 0.04-0.1g indium chloride, and 0.02-0.1g thioacetamide to the above solution, sonicate for 10-30 minutes, and mix thoroughly; 3. The mixed solution obtained in step 2 is placed in an oil bath at 40-100° C. for 1-3 hours, and the Te / ZnIn2S4 composite photocatalyst is obtained after centrifugation and drying.

[0010] Beneficial effects of the present invention: 1. The present invention provides a Te / ZnIn2S4 composite photocatalyst for producing H2O2 and a preparation method thereof, wherein the composite photocatalyst is prepared by a one-step oil bath method using tellurium nanowires, zinc chloride, indium chloride, and thioacetamide as raw materials and only requires common laboratory equipment without special equipment, and the process is simple and easy to operate; 2. This method provides a novel matrix, indium zinc sulfide, for the preparation of Te / ZnIn2S4 composite photocatalysts for H2O2 production; 3. The Te / ZnIn2S4 composite photocatalyst obtained by this method has good cyclic stability; 4. The drugs used in the present invention are inexpensive, simple to prepare and take a short time to prepare. No complicated steps are required after preparation. They are particularly suitable for batch and low-cost preparation, and are suitable for industrial-scale production and commercial applications. 5. The Te / ZnIn2S4 composite photocatalyst provided by the present invention can be successfully applied to the fields of photocatalytic H2O2 production and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the embodiments or the description of the prior art will be briefly introduced with drawings below, but the drawings in the following description are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 This is the transmission electron microscopy (TEM) of the Te / ZnIn2S4 composite photocatalyst prepared in Example 1 of the present invention.

[0013] Figure 2 This is the X-ray diffraction (XRD) pattern of the Te / ZnIn2S4 composite photocatalyst prepared in Example 1 of the present invention.

[0014] Figure 3 This is the absorption spectrum of the Te / ZnIn2S4 composite photocatalyst prepared in Example 1 of the present invention.

[0015] Figure 4 This is a performance test of the photocatalytic H2O2 production of the Te / ZnIn2S4 composite photocatalyst prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0017] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without making any creative work shall fall within the scope of protection of the present invention.

[0018] Unless otherwise specified, the experimental methods described in the following examples are all conventional methods; the reagents and materials described are all commercially available unless otherwise specified.

[0019] Embodiment 1: First, add 10 mg of tellurium nanowires to 20 mL of deionized water and 3 mL of glycerol, and mix thoroughly by ultrasonication for 10 minutes; Then, 0.01 g zinc chloride, 0.04 g indium chloride and 0.02 g thioacetamide were added to the above solution and ultrasonicated for 10 minutes to mix thoroughly. The obtained mixed solution was oil bathed at 80° C. for 1 hour, and after centrifugation and drying, a Te / ZnIn2S4 composite photocatalyst was obtained.

[0020] Embodiment 2: First, add 20 mg of tellurium nanowires to 20 mL of deionized water and 3 mL of glycerol, and mix thoroughly by ultrasonication for 10-30 minutes; Then, 0.02 g zinc chloride, 0.08 g indium chloride and 0.04 g thioacetamide were added to the above solution and ultrasonicated for 20 minutes to mix thoroughly. The obtained mixed solution was oil bathed at 90° C. for 2 hours, and the Te / ZnIn2S4 composite photocatalyst was obtained after centrifugation and drying.

[0021] Embodiment 3: First, add 30 mg of tellurium nanowires to 20 mL of deionized water and 3 mL of glycerol, and mix thoroughly by ultrasonication for 30 minutes; Then, 0.04 g zinc chloride, 0.08 g indium chloride and 0.09 g thioacetamide were added to the above solution and ultrasonicated for 30 minutes to mix thoroughly. The obtained mixed solution was oil bathed at 100° C. for 3 hours, and the Te / ZnIn2S4 composite photocatalyst was obtained after centrifugation and drying.

[0022] Figure 1 TEM of the Te / ZnIn2S4 composite photocatalyst prepared in Example 1. Figure 1 It can be seen that ZnIn2S4 nanosheets are uniformly coated on Te nanowires.

[0023] Figure 2 XRD of the Te / ZnIn2S4 composite photocatalyst prepared in Example 2. Figure 2 It can be seen that all the diffraction peaks point to the characteristic peaks of ZnIn2S4 and Te.

[0024] Figure 3 This is the absorption spectrum of the Te / ZnIn2S4 composite photocatalyst prepared in Example 3. Figure 3 It can be seen that the Te / ZnIn2S4 composite photocatalyst exhibits excellent absorption capacity.

[0025] Figure 4 The performance test of the Te / ZnIn2S4 composite photocatalyst prepared in Example 1 in photocatalytic H2O2 production was carried out. Figure 4 It can be seen that the Te / ZnIn2S4 composite photocatalyst has excellent performance in photocatalytic H2O2 production and good cycle stability. The results show that the prepared Te / ZnIn2S4 composite photocatalyst was successfully used in the field of photocatalytic H2O2 production.

Claims

1. A Te / ZnIn2S4 composite photocatalyst for H2O2 production and a preparation method thereof, comprising the following steps: First, 10-30 mg of tellurium nanowires are added to 20 mL of deionized water and 3 mL of glycerol, and the mixture is ultrasonicated for 10-30 minutes to be thoroughly mixed. Then, 0.01-0.1 g of zinc chloride, 0.04-0.1 g of indium chloride, and 0.02-0.1 g of thioacetamide are added to the above solution, and the mixture is ultrasonicated for 10-30 minutes to be thoroughly mixed. The obtained mixed solution is oil-bathed at 40-100° C. for 1-3 hours, and a Te / ZnIn2S4 composite photocatalyst is obtained after centrifugation and drying.

2. The method for preparing the Te / ZnIn2S4 composite photocatalyst according to claim 1, characterized in that: The amount of tellurium nanowires used was 10 mg, and the amount of zinc chloride used was 0.01 g.

3. The method for preparing the Te / ZnIn2S4 composite photocatalyst according to claim 1, characterized in that: The amount of indium chloride used was 0.04 g, and the amount of thioacetamide used was 0.02 g.

4. The use of the Te / ZnIn2S4 composite photocatalyst prepared by the preparation method according to claim 1, characterized in that: The Te / ZnIn2S4 composite photocatalyst is used for photocatalytic H2O2 production.

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