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A silver phosphate modified magnetic separation hollow composite photocatalyst and its preparation method

A technology of magnetic separation and recombination of light, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of unsatisfactory catalytic effects of photocatalysts, and achieve the potential of promoting practical applications and high-efficiency photocatalysis The effect of high degradation and production efficiency

Active Publication Date: 2016-08-17
SHAANXI UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0003] The purpose of the present invention is to provide a silver phosphate 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

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  • A silver phosphate modified magnetic separation hollow composite photocatalyst and its preparation method

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preparation example Construction

[0024] The preparation method of silver phosphate modified magnetic separation hollow composite photocatalyst of the present invention, the specific steps are:

[0025] Step 1: adopt traditional hydrothermal reaction to prepare phenolic resin microspheres;

[0026] 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 microspheres;

[00...

Embodiment 1

[0031] 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;

[0032] Step 2, mix 10 mL of zinc nitrate solution with a concentration of 0.01 mol / L and 10 mL of ferric nitrate solution with a concentration of 0.01 mol / L to form a mixed solution A, disperse 0.1 g of phenolic resin microspheres into the mixed solution A, and process 15min, after aging for 3 hours, washed with water and centrifuged 3 times, then dried in a vacuum oven at 50°C for 24h, calcined the obtained product in air, slowly heated to 350°C, kept for 1h, and then cooled naturally to obtain ZnFe ...

Embodiment 2

[0035] 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;

[0036] Step 2, 10mL of zinc chloride solution with a concentration of 4mol / L and 19mL of ferric chloride solution with a concentration of 4mol / L are mixed to form a mixed solution A, and 2.9g of phenolic resin microspheres are dispersed in the mixed solution A, and ultrasonically treated 15min, after aging for 3 hours, washed with water and centrifuged three times, then dried in a vacuum oven at 50°C for 24h, calcined the obtained product in air, slowly heated to 1000°C, kept for 5h, and...

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Abstract

The invention discloses a silver phosphate modified magnetic separation hollow composite photocatalyst, which is composed of ZnFe 2 o 4 , ZnO and Ag 3 PO 4 Composite; the particle size of the hollow microsphere is 50-1000nm, and the thickness of the hollow shell is 1-100nm. The invention also discloses its preparation method: mixing zinc salt and iron salt solution into phenolic resin microspheres, ultrasonic aging, drying, calcining, and then adding AgNO 3 Ethanol solution and Na 3 PO 4 Ethanol solution, stirring, and drying. The present invention consists of ZnFe 2 o 4 , ZnO and Ag 3 PO 4 It forms a heterojunction with a waterfall structure, which promotes the effective separation of photogenerated electrons and holes, thereby improving its photocatalytic activity; ZnFe 2 o 4 It has magnetism, is easy to separate and recover, and has a simple preparation method.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a silver phosphate-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 surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/185B01J35/08
Inventor 李军奇刘振兴刘辉何选盟朱振峰
Owner SHAANXI UNIV OF SCI & TECH
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