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Supported zinc-erbium co-doped bismuth ferrite photocatalyst and preparation method and application thereof

A photocatalyst and co-doping technology, which is applied in the field of photocatalytic materials, can solve the problems of unfavorable photocatalyst regeneration and reuse, poor stability of suspended catalysts, and difficult separation and recovery of photocatalysts, so as to increase photocatalytic reaction sites, Improvement of photocatalytic efficiency and enhancement of photocatalytic performance

Inactive Publication Date: 2019-05-21
SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main reason is that photocatalysts are difficult to separate and recycle. Since most photocatalysts used in photocatalytic oxidation technology are powders in the process of treating organic pollutants, they are easy to condense and not easy to settle in water, which will easily cause the loss of photocatalysts, which is not conducive to the development of photocatalysts. regeneration and reuse
Immobilizing photocatalysts can solve the problem of difficult separation and recovery of catalysts, and can also overcome the shortcomings of poor stability and easy poisoning of suspended phase catalysts

Method used

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  • Supported zinc-erbium co-doped bismuth ferrite photocatalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Soak the honeycomb ceramic sample in 10% dilute nitric acid solution for 1 hour, take it out, rinse it with deionized water, dry it in an oven at 80°C for 2 hours, put it in a muffle furnace for calcination at 300°C for 3 hours, and set it aside. Dissolve a certain amount of ferric nitrate and zinc acetate in the mixed solution of 50mL absolute ethanol and glacial acetic acid (wherein the volume ratio of absolute ethanol and glacial acetic acid is 1:1) to obtain solution A, simultaneously a certain amount of bismuth nitrate and Erbium nitrate was dissolved in 50mL of a mixed solution of absolute ethanol and glacial acetic acid (wherein the volume ratio of absolute ethanol and glacial acetic acid was 1:1) to obtain solution B, and then slowly poured into solution B under rapid stirring at 800r / min. Drop all the A liquids to obtain solution C, so that the stoichiometric ratio of the zinc-erbium co-doped bismuth ferrite formed by ferric nitrate, bismuth nitrate, zinc acetat...

Embodiment 2

[0037] Soak the honeycomb ceramic sample in 10% dilute sulfuric acid solution for 1 hour, take it out and rinse it with deionized water, then dry it in an oven at 80°C for 2 hours, put it in a muffle furnace for calcination at 800°C for 0.5 hour, and set it aside. Dissolve a certain amount of ferric nitrate and zinc acetate in the mixed solution of 50mL absolute ethanol and glacial acetic acid (wherein the volume ratio of absolute ethanol and glacial acetic acid is 1:1) to obtain solution A, simultaneously a certain amount of bismuth nitrate and Erbium nitrate was dissolved in 50mL of a mixed solution of absolute ethanol and glacial acetic acid (wherein the volume ratio of absolute ethanol and glacial acetic acid was 1:1) to obtain solution B, and then slowly poured into solution B under rapid stirring at 800r / min. Drop all the A liquids to obtain solution C, so that the stoichiometric ratio of the zinc-erbium co-doped bismuth ferrite formed by ferric nitrate, bismuth nitrate, ...

Embodiment 3

[0039] Soak the copper foam sample in 10% dilute hydrochloric acid solution for 1 hour, take it out and rinse it with deionized water, then dry it in an oven at 80°C for 2 hours, put it in a muffle furnace for calcination at 600°C for 1 hour, and set it aside. Dissolve a certain amount of ferric nitrate and zinc acetate in the mixed solution of 50mL absolute ethanol and glacial acetic acid (wherein the volume ratio of absolute ethanol and glacial acetic acid is 1:1) to obtain solution A, simultaneously a certain amount of bismuth nitrate and Erbium nitrate was dissolved in 50mL of a mixed solution of absolute ethanol and glacial acetic acid (wherein the volume ratio of absolute ethanol and glacial acetic acid was 1:1) to obtain solution B, and then slowly poured into solution B under rapid stirring at 800r / min. Drop all the A liquids to obtain solution C, so that the stoichiometric ratio of the zinc-erbium co-doped bismuth ferrite formed by ferric nitrate, bismuth nitrate, zinc...

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Abstract

The invention belongs to the technical field of photocatalytic materials, and discloses a supported zinc-erbium co-doped bismuth ferrite photocatalyst, and a preparation method and application thereof. The preparation method of the photocatalyst comprises the following steps: (1) immersing a photocatalyst carrier in an acidic solution for soaking, then taking out the photocatalyst carrier, and washing, drying and then calcining the photocatalyst carrier at high temperature; (2) preparing two identical mixed solutions of absolute ethyl alcohol and glacial acetic acid, dissolving an iron-containing compound and a zinc-containing compound in one of the mixed solutions, dissolving a bismuth-containing compound and an erbium-containing compound in the other mixed solution, and mixing the two mixed solutions under stirring to obtain a solution C; (3) adding an alkaline solution to the solution C dropwise under stirring to obtain sol; and (4) immersing the calcined photocatalyst carrier in the sol, then transferring the photocatalyst carrier to a hydrothermal reaction kettle for reaction, taking out the photocatalyst carrier after the reaction is completed, and washing and drying the photocatalyst carrier to obtain the target photocatalyst. The photocatalytic performance of the obtained catalyst is obviously enhanced compared with that of pure bismuth ferrite; the catalyst is firmly supported and is not prone to falling off; and the preparation process is simple and the repeatability is good.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to an immobilized zinc-erbium co-doped bismuth ferrite photocatalyst, its preparation method and application. Background technique [0002] With the development of modern society, environmental problems have become increasingly severe. Organic pollution is one of the most serious environmental problems at present. In recent years, the application of photocatalysts in the treatment of organic pollutants has become one of the hotspots of people's research. Bismuth ferrite is a new type of semiconductor photocatalyst that can use visible light for photocatalysis. It is also a material with ferroelectricity and magnetism at room temperature. It has stable chemical properties and low cost, and has attractive application prospects. However, due to the low photon quantum yield of bismuth ferrite, the catalytic efficiency is not high, and the weak magnetism leads to poor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/843B01J37/10B01J37/08C02F1/30C02F101/38
Inventor 陈志鸿陈艳波孟庆国苑明哲吕海钦
Owner SHENYANG INST OF AUTOMATION GUANGZHOU CHINESE ACAD OF SCI
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