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Method for preparing tungsten trioxide/tungstic acid composite photocatalytic material through in-situ self growth

A composite photocatalysis and tungsten trioxide technology, applied in the field of photocatalytic materials, can solve the problems of uneven distribution and difficult control of the synthesis process, and achieve the effects of uniform distribution of components, pure phase, and uniformity.

Active Publication Date: 2019-01-04
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for preparing tungsten trioxide / zinc tungstate composite photocatalytic material by self-growth in situ, which solves the problem of WO in the prior art. 3 / ZnWO 4 The problem of uneven distribution and difficult control of synthesis process

Method used

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  • Method for preparing tungsten trioxide/tungstic acid composite photocatalytic material through in-situ self growth
  • Method for preparing tungsten trioxide/tungstic acid composite photocatalytic material through in-situ self growth

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Embodiment 1

[0023] The method for preparing tungsten trioxide / zinc tungstate composite photocatalytic material by in-situ self-growth, specifically according to the following steps:

[0024] Step 1, configure zinc chloride solution and sodium tungstate solution; dissolve zinc chloride in deionized water to prepare a zinc chloride solution with a concentration of 0.2mol / L, and dissolve sodium tungstate in deionized water to prepare Sodium tungstate solution with a concentration of 0.2mol / L;

[0025]Step 2. Add the zinc chloride solution into the reaction kettle, and add the surfactant polyvinylpyrrolidone. The concentration of polyvinylpyrrolidone in the zinc chloride solution is 0.1g / L. After stirring for 30 minutes, add it dropwise with the zinc chloride solution Equimolar sodium tungstate solution, closed reaction vessel, and carried out hydrothermal reaction, the temperature of hydrothermal reaction in the reaction kettle is 130°C, and the reaction time is 12h, to prepare ZnWO 4 Preci...

Embodiment 2

[0029] The method for preparing tungsten trioxide / zinc tungstate composite photocatalytic material by in-situ self-growth, specifically according to the following steps:

[0030] Step 1. Configure zinc acetate solution and ammonium metatungstate solution; dissolve zinc acetate in deionized water to prepare a zinc acetate solution with a concentration of 0.6mol / L, and dissolve ammonium metatungstate in deionized water to prepare a concentration of 0.6mol / L ammonium metatungstate solution;

[0031] Step 2, adding the zinc acetate solution to the reaction kettle, and adding the surfactant cetyltrimethylammonium bromide, the concentration of cetyltrimethylammonium bromide in the zinc acetate solution is 2.55g / L , after stirring for 45 minutes, add dropwise ammonium metatungstate solution equimolar to zinc acetate solution, seal the reaction vessel, and carry out hydrothermal reaction. 4 Precipitate, filter and dry to obtain ZnWO with a particle size of 65nm 4 For powder, the dry...

Embodiment 3

[0035] The method for preparing tungsten trioxide / zinc tungstate composite photocatalytic material by in-situ self-growth, specifically according to the following steps:

[0036] Step 1, configure zinc sulfate solution and ammonium metatungstate solution; dissolve zinc sulfate in deionized water to prepare a zinc sulfate solution with a concentration of 1mol / L, and dissolve ammonium metatungstate in deionized water to prepare a concentration of 1mol / L ammonium metatungstate solution;

[0037] Step 2. Add the zinc sulfate solution into the reaction kettle, and add the surfactant disodium edetate, the concentration of disodium edetate in the zinc sulfate solution is 5g / L, stir for 60 minutes and then add dropwise Equimolar ammonium metatungstate solution and zinc sulfate solution, sealed reaction vessel, and carried out hydrothermal reaction, the temperature of hydrothermal reaction in the reaction kettle is 200 ℃, the reaction time is 4h, to prepare ZnWO 4 Precipitate, filter ...

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Abstract

The invention discloses a method for preparing a tungsten trioxide / tungstic acid composite photocatalytic material through in-situ self growth. The method comprises the following steps: by taking water-soluble tungstate and zinc salt as raw materials, preparing nano tungstic acid powder by using a hydrothermal method, carrying out in-situ medium reduction on the tungstic acid powder in the presence of H2 so as to prepare W / WO3 / ZnWO4 composite powder, and finally carrying out a thermal treatment process to oxidize W into WO3, thereby obtaining in-situ self growth W / WO3 / ZnWO4 composite powder. The method is simple to operate, in-situ self growth of WO3 is carried out on the surface of ZnWO4, the phenomenon that in the prior art components are not uniformly distributed when the W / WO3 / ZnWO4 composite powder is prepared can be effectively solved, and the stability of properties of the composite powder can be ensured.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a method for preparing tungsten trioxide / zinc tungstate composite photocatalytic materials by self-growth in situ. Background technique [0002] Environmental problems are becoming more and more serious, how to efficiently and cost-effectively manage the environment is one of the key directions of future scientific development. Since solar energy is an inexhaustible green energy source, it is of great practical significance to efficiently benefit solar energy to control environmental pollution. wxya 4 It is the most researched semiconductor photocatalytic material at present. Photocatalytic materials mainly absorb incident photons to stimulate the generation of electron-hole pairs to participate in chemical reactions and achieve the purpose of degrading organic pollutants. However, ZnWO 4 The forbidden band is wide, and the ability to excite it to generate el...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J37/10B01J37/18
CPCB01J23/002B01J23/30B01J37/10B01J37/18B01J35/393B01J35/23B01J35/39
Inventor 羊求民毛莉陈丽勇
Owner JIANGXI UNIV OF SCI & TECH
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