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Visible-light-responsive zinc stannate/bismuth oxyiodide composite photocatalytic material and preparation method thereof

A technology of composite photocatalysis and composite materials, which is applied in the field of zinc stannate/bismuth oxyiodide composite photocatalytic materials and its preparation, can solve the problem of unsatisfactory photocatalytic performance, narrow spectral response range, and photogenerated electron-hole recombination. High efficiency and other problems, to achieve excellent photocatalytic properties, high application value, low cost effect

Pending Publication Date: 2022-04-22
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recombination of pure-phase bismuth oxyiodide photogenerated electron-hole pairs is relatively fast, and its practical photocatalytic performance is still unsatisfactory.
At present, the research on semiconductor photocatalysts is mainly restricted by the high recombination rate of photogenerated electron-hole pairs and narrow spectral response range.

Method used

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  • Visible-light-responsive zinc stannate/bismuth oxyiodide composite photocatalytic material and preparation method thereof
  • Visible-light-responsive zinc stannate/bismuth oxyiodide composite photocatalytic material and preparation method thereof
  • Visible-light-responsive zinc stannate/bismuth oxyiodide composite photocatalytic material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Weigh respectively tin tetrachloride pentahydrate and zinc acetate dihydrate in equimolar amounts and dissolve them in a certain volume of ethylene glycol, marked as A, wherein the molar concentration of tin tetrachloride pentahydrate is 0.05 M; then hydrogen Potassium oxide is dissolved in a certain volume of deionized water, marked as B, the concentration of solution B is 0.5 M, and the volume ratio of solution B to solution A is 0.6; under magnetic stirring, slowly add solution B to solution A , continue to stir for 30 minutes to obtain zinc stannate precursor solution; transfer the mixed solution after uniform stirring to a stainless steel reaction kettle with polytetrafluoroethylene lining, and heat it in a solvent at 120 ° C for 20 hours; At room temperature, centrifuge to separate the precipitate, wash the obtained sample several times with deionized water and absolute ethanol, and dry at 80°C to obtain a pure zinc stannate sample with a hollow cubic structure. Th...

Embodiment 2

[0039] Weigh respectively tin tetrachloride pentahydrate and zinc acetate dihydrate in equimolar amounts and dissolve them in a certain volume of ethanol, marked as A; wherein, the molar concentration of tin tetrachloride pentahydrate is 0.08 M; then potassium hydroxide Dissolve in a certain volume of deionized water, marked as B, the concentration of solution B is 0.6 M, and the volume ratio of solution B to solution A is 0.1; under magnetic stirring, slowly add solution B to solution A, continue Stir for 30 minutes to obtain the zinc stannate precursor solution; transfer the mixed solution after uniform stirring to a stainless steel reaction kettle lined with polytetrafluoroethylene, and heat it in a solvent at 140 ° C for 16 hours; after the reaction is completed, cool to room temperature naturally, The precipitate was separated by centrifugation, and the obtained sample was washed several times with deionized water and absolute ethanol, and dried at 80°C to obtain a pure zi...

Embodiment 3

[0042] Weigh equimolar amounts of tin tetrachloride pentahydrate and zinc acetate dihydrate and dissolve them in a certain volume of deionized water, marked as A; wherein, the molar concentration of tin tetrachloride pentahydrate is 0.1 M; Potassium is dissolved in a certain volume of deionized water, marked as B, the concentration of solution B is 0.8M, and the volume ratio of solution B to solution A is 0.75; under magnetic stirring, slowly add solution B to solution A, Stirring was continued for 30 minutes to obtain zinc stannate precursor solution; the mixed solution after stirring was transferred to a stainless steel reaction kettle with polytetrafluoroethylene lining, and the hydrothermal method was carried out at 140 ° C for 12 hours; after the reaction was completed, it was naturally cooled to At room temperature, the precipitate was separated by centrifugation, and the obtained sample was washed several times with deionized water and absolute ethanol, and dried at 80°C...

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Abstract

The invention belongs to the technical field of composite materials and photocatalysis, and particularly relates to a visible-light response zinc stannate / bismuth oxyiodide composite photocatalytic material and a preparation method thereof. The zinc stannate and the bismuth oxyiodide in the composite material are prepared by adopting a solvothermal method, and a p-n heterojunction is formed between the zinc stannate and the bismuth oxyiodide, so that effective separation of photo-induced electrons and holes is promoted, and the photocatalytic reaction efficiency of a catalyst under visible light is improved. The preparation method comprises the following steps: (1) preparing porous cubic zinc stannate by adopting a solvothermal method; and (2) compounding zinc stannate and bismuth oxyiodide through a solvothermal method to prepare the zinc stannate / bismuth oxyiodide composite photocatalytic material. The preparation method has the advantages that the preparation process is simple, the cost is low, and the obtained composite material has a relatively good structure and morphology, so that the prepared composite photocatalyst shows relatively excellent photocatalytic activity and has a very good application prospect.

Description

technical field [0001] The invention relates to the technical field of composite materials and photocatalysis, in particular to a zinc stannate / bismuth oxyiodide composite photocatalytic material responsive to visible light and a preparation method thereof. Background technique [0002] With the rapid development of society and economy, energy shortage and environmental pollution have become major challenges that mankind needs to deal with together. Semiconductor photocatalysis technology can directly use sunlight to drive the reaction, and has the characteristics of "green and high efficiency", which makes it have a very broad application prospect in the field of environmental governance and purification. In recent years, photocatalytic technology using oxide semiconductors as photocatalysts has provided us with an ideal method and approach for energy development and utilization and environmental pollution control. Titanium oxide is currently the most widely studied photoc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138B01J35/00B01J35/02
CPCB01J27/138B01J35/50B01J35/39
Inventor 朱路平王小雨王利军杨慧祝向荣
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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