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Silver phosphate modified magnetic separation type hollow composite photocatalyst and preparation method thereof

A magnetic separation, silver phosphate technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve the problems of unsatisfactory photocatalyst catalytic effect, and achieve the potential of promoting practical application, high-efficiency photocatalysis Degradation, the effect of improving photocatalytic activity

Active Publication Date: 2014-11-19
SHAANXI UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Silver phosphate modified magnetic separation type hollow composite photocatalyst and preparation method thereof
  • Silver phosphate modified magnetic separation type hollow composite photocatalyst and preparation method thereof
  • Silver phosphate modified magnetic separation type hollow composite photocatalyst and preparation method thereof

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preparation example Construction

[0027]The preparation method of silver phosphate modified magnetic separation hollow composite photocatalyst of the present invention, the specific steps are:

[0028] Step 1: adopt traditional hydrothermal reaction to prepare phenolic resin microspheres;

[0029] 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;

[003...

Embodiment 1

[0034] 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;

[0035] 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

[0038] 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;

[0039] 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 type hollow composite photocatalyst. The silver phosphate modified magnetic separation type hollow composite photocatalyst is compounded by ZnFe2O4, ZnO and Ag3PO4; and the grain diameter of each hollow micro-sphere is 50-1000nm and the thickness of a hollow shell layer is 1-100nm. The invention further discloses a preparation method of the silver phosphate modified magnetic separation type hollow composite photocatalyst. The preparation method comprises the following steps: mixing a zinc salt liquid and an iron salt liquid to obtain a mixed liquid, and adding the phenolic resin micro-spheres to the mixed liquid; ageing by ultrasounds, drying and calcining; adding an AgNO3 ethanol liquid and a Na3PO4 ethanol liquid; and agitating and drying to obtain the silver phosphate modified magnetic separation type hollow composite photocatalyst. The silver phosphate modified magnetic separation type hollow composite photocatalyst is compounded by the ZnFe2O4, the ZnO and the Ag3PO4 to form a heterojunction with a waterfall-shaped structure and photoelectrons and holes are effectively separated, so that the photocatalytic activity is improved; and the ZnFe2O4 has the magnetism and is easy to separate and recycle, and the preparation method is simple.

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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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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