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Bismuth-tungstate-modified magnetic-separation hollow composite photocatalyst and preparation method thereof

A technology of magnetic separation and bismuth tungstate, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of unsatisfactory photocatalyst catalytic effect and achieve Effects of promoting application potential, high preparation efficiency, and mild reaction conditions

Active Publication Date: 2014-11-05
陕西万华环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bismuth tungstate-modified magnetic separation hollow composite photocatalyst, which solves the problem that the catalytic effect of the existing two-phase composite heterojunction photocatalyst is not ideal

Method used

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  • Bismuth-tungstate-modified magnetic-separation hollow composite photocatalyst and preparation method thereof
  • Bismuth-tungstate-modified magnetic-separation hollow composite photocatalyst and preparation method thereof
  • Bismuth-tungstate-modified magnetic-separation hollow composite photocatalyst and preparation method thereof

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preparation example Construction

[0031] The preparation method of the above bismuth tungstate modified magnetic separation hollow composite photocatalyst, the specific preparation steps are as follows:

[0032] Step 1, adopting traditional hydrothermal reaction to prepare phenolic resin microspheres;

[0033] The preparation volume ratio is 1:(10~100):(59~179) ammoniacal liquor, the mixed solution of ethanol and water, wherein the concentration of ammoniacal liquor is 25%; Resorcinol and concentration are 37% formalin solution Add the above mixed solution, place it in a water bath at 10-60°C and stir for 10 hours, wherein the mass volume ratio of resorcinol and mixed solution is 1: (70-280) g / ml, formalin solution and mixed solution The volume ratio of the solution is 1: (50-200); transfer the solution to a hydrothermal kettle, and keep it at 100°C for 24h; after natural cooling, wash it with absolute ethanol and deionized water three times, and then dry it at 50°C for 24h , to obtain phenolic resin microsph...

Embodiment 1

[0038] Step 1, mix 59mL of deionized water, 10mL of ethanol and 1mL of 25% ammonia solution, place in a water bath at 15°C, then add 0.25g of resorcinol and 0.35mL of formaldehyde solution, stir in the water bath for 10h, then put The solution was transferred to a hydrothermal kettle and kept at 100°C for 24 hours; after natural cooling, it was rinsed three times with absolute ethanol and deionized water, and then dried at 50°C for 24 hours to obtain phenolic resin microspheres;

[0039] Step 2, mix 10mL of zinc nitrate solution with a concentration of 0.01mol / L and 21mL of ferric nitrate solution with a concentration of 0.01mol / L to form a mixed solution A, disperse 0.155g of phenolic resin microspheres into the mixed solution A, and process 15min, after aging for 3 hours, washed with water and centrifuged for 3 times, then dried in a vacuum oven at 50°C for 24h, and the obtained product was 2 Calcined in medium, slowly heated to 350°C and kept for 1h, then cooled naturally t...

Embodiment 2

[0042] Step 1, mix 179mL of deionized water, 100mL of ethanol and 1mL of 25% aqueous ammonia solution, place in a water bath at 60°C, then add 4g of resorcinol and 5.6mL of formaldehyde solution, stir in the water bath for 10h, and then mix the The solution was transferred to a hydrothermal kettle and kept at 100°C for 24 hours; after natural cooling, it was rinsed three times with absolute ethanol and deionized water, and then dried at 50°C for 24 hours to obtain phenolic resin microspheres;

[0043] Step 2: Mix 10mL of zinc chloride solution with a concentration of 4mol / L and 40mL of ferric chloride solution with a concentration of 4mol / L to form a mixed solution A, disperse 5g of phenolic resin microspheres into the mixed solution A, and ultrasonically treat for 15min , aged for 3 hours, washed with water and centrifuged for 3 times, then dried in a vacuum oven at 50°C for 24 hours, and the obtained product was placed in N 2 Calcined in medium, slowly heated to 1000°C and k...

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Abstract

The invention discloses a bismuth-tungstate-modified magnetic-separation hollow composite photocatalyst which is obtained by composing ZnFe2O4, Fe2O3 and Bi2WO6. A particle size of hollow micro-spheres is 50-1000nm, and a hollow housing thickness is 1-100nm. The invention also discloses a preparation method of the photocatalyst. The method comprises the following steps: phenolic resin micro-spheres are prepared through a hydrothermal reaction; the micro-spheres are soaked in a mixed solution of iron salt and zinc salt, and ultrasonic processing, aging, and calcining are carried out, such that C@ZnFe2O4-Fe2O3 micro-spheres are obtained; the C@ZnFe2O4-Fe2O3 micro-spheres are soaked in a mixed ethylene glycol solution of Bi(NO3)3 and Na2WO4, and ultrasonic processing, aging, and calcining are carried out, such that the photocatalyst is obtained. With the photocatalyst provided by the invention, toxic and harmful substances can be highly efficiently photo-catalytically degraded under sunlight and ultraviolet light. A degradation rate is close to 100%. Also, ZnFe2O4 has magnetism, and is easy to separate and recover. The preparation method of the photocatalyst is simple.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a bismuth tungstate modified magnetic separation hollow composite photocatalyst, and also relates to a preparation method of the composite photocatalyst. Background technique [0002] The treatment of environmental pollution is one of the major problems that human beings are facing urgently today. The purification of environmental pollution by photocatalytic oxidation has attracted much attention due to its advantages of low energy consumption, mild purification conditions, no secondary pollution, and deep oxidation. Among them, the composition and morphology design of photocatalysts are at the core of this technology and the key to the efficiency of photocatalytic oxidation. Compared with traditional powder photocatalysts, hollow nano photocatalysts have small size, large surface volume fraction, different chemical bond states and electronic states on the surf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888
Inventor 李军奇刘振兴刘辉何选盟朱振峰
Owner 陕西万华环境工程有限公司
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