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CN-121972186-A - Zn (zinc)0.3Cd0.7Preparation method of S@CFR heterojunction photocatalyst

CN121972186ACN 121972186 ACN121972186 ACN 121972186ACN-121972186-A

Abstract

The invention discloses a preparation method of a Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst, which comprises the steps of firstly preparing a Zn 0.3 Cd 0.7 S catalyst by a hydrothermal method, dispersing the Zn 0.3 Cd 0.7 S catalyst in ultrapure water, then sequentially adding catechol, ammonia water and formaldehyde into the dispersion liquid, enabling CFR to uniformly grow on the surface of the Zn 0.3 Cd 0.7 S through a hydrothermal reaction, forming a coating layer, and washing and drying to obtain a final product.

Inventors

  • YANG JINGKAI
  • ZHENG YANZHI
  • DONG CHENXU
  • Qin Ludi
  • LI XINYAN
  • LIU SITONG

Assignees

  • 燕山大学

Dates

Publication Date
20260505
Application Date
20260129

Claims (9)

  1. 1. The preparation method of the Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst is characterized by sequentially carrying out the following steps: s1, preparing Zn 0.3 Cd 0.7 S catalyst by adopting hydrothermal method S11, placing zinc acetate and cadmium acetate into a mixed solution of 40 mL deionized water and ethylenediamine, wherein the volume ratio of the deionized water to the ethylenediamine is 1:1, stirring at room temperature for 20-30 min, adding thioacetamide into the mixture, and continuously stirring for 10-15 min to obtain a precursor; S12, placing the precursor in a hydrothermal reaction kettle for hydrothermal reaction, cooling, centrifuging, collecting precipitate, respectively washing the precipitate for 3-5 times by adopting deionized water and absolute ethyl alcohol, drying and grinding to 100-200 meshes to obtain bright yellow Zn 0.3 Cd 0.7 S powder, namely a Zn 0.3 Cd 0.7 S catalyst; S2, preparing Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst by adopting hydrothermal method Dispersing Zn 0.3 Cd 0.7 S catalyst into ultrapure water by ultrasonic, sequentially adding catechol, ammonia water and formaldehyde, uniformly mixing, performing hydrothermal reaction at 140-160 ℃ for 6-8 h, cooling, centrifugally collecting precipitate, washing the precipitate with deionized water and absolute ethyl alcohol for 3-5 times respectively, drying and grinding to 100-200 meshes to obtain Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst.
  2. 2. The method for preparing a Zn 0.3 Cd 0.7 s@cfr heterojunction photocatalyst according to claim 1, wherein in step S11, the molar ratio of zinc acetate to cadmium acetate to thioacetamide is 0.3:0.7:1.25.
  3. 3. The method for preparing a Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst according to claim 1, wherein in the step S12, the temperature in the hydrothermal reaction is 200-205 ℃ and the time is 22-24 h.
  4. 4. The method for preparing a Zn 0.3 Cd 0.7 s@cfr heterojunction photocatalyst as claimed in claim 1, wherein in step S12, the temperature at the time of drying is 60-70 ℃ and the time is 24-30 h.
  5. 5. The method for preparing the Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst according to claim 1, wherein in the step S2, the mass ratio of the Zn 0.3 Cd 0.7 S catalyst to catechol is 5 (1-3).
  6. 6. The preparation method of the Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst according to claim 1, wherein in the step S2, the mass volume ratio of catechol to ammonia water is (40-120): (24-72) mg/uL, and the mass fraction of the ammonia water is 25-28wt.%.
  7. 7. The preparation method of the Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst according to claim 1, wherein in the step S2, the mass volume ratio of catechol to formaldehyde is (40-120): (60-180) mg/uL, and the formaldehyde is an aqueous formaldehyde solution with the mass fraction of 37 wt.%.
  8. 8. The method for preparing a Zn 0.3 Cd 0.7 s@cfr heterojunction photocatalyst as claimed in claim 1, wherein in the step S2, the temperature at the time of drying is 60-70 ℃ and the time is 24-30 h.
  9. 9. The method for preparing the Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst according to any one of claims 1 to 8, wherein the morphology of the prepared Zn 0.3 Cd 0.7 S@CFR heterojunction photocatalyst is a core-shell structure.

Description

Preparation method of Zn 0.3Cd0.7 S@CFR heterojunction photocatalyst Technical Field The invention belongs to the field of photocatalytic preparation of H 2O2, and relates to a preparation method of a Zn 0.3Cd0.7 S@CFR heterojunction photocatalyst. Background Hydrogen peroxide (H 2O2) has been widely used in the fields of chemical industry, medical treatment, energy sources, environmental protection, etc., as a green, efficient, environmentally friendly multifunctional oxidizing agent. With the advancement of the worldwide sustainable development goal, the demand for H 2O2 is expected to continue to increase. Anthraquinone is a relatively mature production process at present, but the production process is complex, requires a large amount of energy input, and is usually accompanied by high pollution problems. Therefore, there is a need to develop green, clean sustainable alternative technologies. The solar-driven photocatalysis H 2O2 can realize the green synthesis of H 2O2 by only relying on solar energy, water and oxygen, has the dual characteristics of zero-carbon energy input and mild reaction conditions, and meets the requirements of economy, environmental protection and sustainable development. Among many photocatalysts, zn xCd1-x S exhibits excellent photocatalytic potential by virtue of its tunable energy band structure, excellent visible light response capability, strong reducibility, and good electron mobility. However, in practical application, the method is still limited by some key problems, such as insufficient adsorption activity of O 2, mismatch of electron and proton transfer kinetics, and the like, so that the whole reaction process is limited. Therefore, promoting the effective separation and migration of photogenerated electrons and holes, enhancing the adsorption and activation ability of O 2, and regulating the surface proton microenvironment are key to improving the generation efficiency and stability of Zn xCd1-x S-based photocatalyst H 2O2. In addition, the existing Zn xCd1-x S photocatalysis system still faces the following scientific problems that firstly, the heterojunction interface contact quality is poor, carrier transmission is blocked, secondly, the single modification strategy is difficult to realize the cooperative optimization of efficient separation and migration of photogenerated carriers and interface proton supply dynamics matching, and thirdly, the photocatalysis system is poor in stability in long-term operation, is easy to generate photo-corrosion and affects the recycling performance. Based on the method, the organic-inorganic coating interface is constructed, so that the efficient collaborative optimization of the surface reaction path and the active site is realized, and the photocatalytic performance of the Zn xCd1-x S photocatalyst is obviously improved. Disclosure of Invention Aiming at the technical problems, the invention aims to provide a preparation method of a Zn 0.3Cd0.7 S@CFR heterojunction photocatalyst, which comprises the steps of firstly preparing a Zn 0.3Cd0.7 S catalyst by a hydrothermal method and dispersing the Zn 0.3Cd0.7 S catalyst in ultrapure water, then sequentially adding catechol, ammonia water and formaldehyde into the dispersion liquid, uniformly growing the CFR on the surface of the Zn 0.3Cd0.7 S through a hydrothermal reaction to form a coating layer, and washing and drying to obtain a final product. In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the preparation method of the Zn 0.3Cd0.7 S@CFR heterojunction photocatalyst sequentially comprises the following steps of: s1, preparing Zn 0.3Cd0.7 S catalyst by adopting hydrothermal method S11, placing zinc acetate and cadmium acetate in a mixed solution of 40 mL deionized water and ethylenediamine, wherein the volume ratio of the deionized water to the ethylenediamine is 1:1, stirring at room temperature for 20-30 min, adding thioacetamide into the mixed solution, and continuing stirring for 10-15 min to obtain a precursor; S12, placing the precursor in a hydrothermal reaction kettle for hydrothermal reaction, cooling, centrifuging, collecting precipitate, respectively washing the precipitate for 3-5 times by adopting deionized water and absolute ethyl alcohol, drying and grinding to 100-200 meshes to obtain bright yellow Zn 0.3Cd0.7 S powder, namely a Zn 0.3Cd0.7 S catalyst; S2, preparing Zn 0.3Cd0.7 S@CFR heterojunction photocatalyst by adopting hydrothermal method Dispersing Zn 0.3Cd0.7 S catalyst into ultrapure water by ultrasonic, sequentially adding catechol, ammonia water and formaldehyde, uniformly mixing, performing hydrothermal reaction at 140-160 ℃ for 6-8 h, cooling, centrifugally collecting precipitate, washing the precipitate with deionized water and absolute ethyl alcohol for 3-5 times respectively, drying and grinding to 100-200 meshes to obtain Zn 0.3Cd0.7 S@CFR heterojunction photocatalyst. As a limitation of the pres