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Preparation method of copper modified violet tungsten oxide photocatalyst

A technology of photocatalyst and violet tungsten, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. It can solve the problems of long preparation time, high catalyst cost and particle size and distribution, uneven pore structure, etc., to achieve the effect of simple process and low cost

Active Publication Date: 2015-07-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But also due to the solid-liquid mixing, resulting in insufficient mixing uniformity
In a word, some of the current methods for preparing doped tungsten oxide photocatalysts take a long time to prepare, some methods have problems such as particle size and distribution, uneven pore structure, and some have relatively high costs for preparing catalysts.

Method used

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  • Preparation method of copper modified violet tungsten oxide photocatalyst
  • Preparation method of copper modified violet tungsten oxide photocatalyst
  • Preparation method of copper modified violet tungsten oxide photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh copper nitrate (Cu(NO 3 ) 2 )0.01mol, ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.24mol, urea (CO(NH 2 ) 2 )0.1mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, heat at a constant temperature of 200°C, and after the solution is evaporated to dryness, a violent redox reaction occurs within tens of seconds to form copper-doped violet tungsten powder. The obtained powder is in the shape of nano needles with a diameter of 30-150 nm and a length of 1-3 μm. It takes 40 minutes for the catalyst with a concentration of 1 g / L to completely degrade 20 ppm of organic pollutants (methylene blue).

Embodiment 2

[0023] Weigh copper nitrate (Cu(NO 3 ) 2 )0.01mol, ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.24mol, urea (CO(NH 2 ) 2 )0.15mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until it is completely dissolved, heat at a constant temperature of 200°C, and after the solution is evaporated to dryness, a violent redox reaction occurs within tens of seconds to form copper-doped violet tungsten powder. The obtained powder is in the shape of nano needles with a diameter of 50-150 nm and a length of 1-3 μm. It takes 35 minutes for the catalyst with a concentration of 1 g / L to completely degrade 20 ppm of organic pollutants (methylene blue).

Embodiment 3

[0025] Weigh copper nitrate (Cu(NO 3 ) 2 )0.01mol, ammonium metatungstate ((NH 4 ) 6 h 2 W 12 o 40 )0.01mol, ammonium nitrate (NH 4 NO 3 )0.36mol, urea (CO(NH 2 ) 2 )0.1mol. Dissolve the raw material powder in an appropriate amount of deionized water and stir until completely dissolved, then heat at a constant temperature of 200°C, and after the solution is evaporated to dryness, a violent redox reaction occurs within tens of seconds to form copper-doped violet tungsten powder. The obtained powder is in the shape of nano needles with a diameter of 60-150 nm and a length of 1-2 μm. It takes 50 minutes for the catalyst with a concentration of 1 g / L to completely degrade 20 ppm of organic pollutants (methylene blue).

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Abstract

The invention discloses a copper modified violet tungsten oxide photocatalyst material. Copper with a proper concentration is doped, and the copper ions can enter crystal lattices of violet tungsten oxide and introduced into defect positions, so as to influence composition of electrons and electron holes, and under the proper concentration achieve the optimal catalysis effect. Meanwhile, the invention discloses a preparation method of the catalyst material. The copper doped violet tungsten oxide powder is synthesized by a solution method, so that the preparation method is short in reaction time and low in reaction triggering temperature; the obtain nanocrystalline catalyst powder is 30-200 nm in diameter and 1-3 microns in length. The copper modified violet tungsten oxide photocatalyst material and the preparation method thereof disclosed by the invention solve the problem that the photocatalytic performance is remarkably improved by the method of appropriate doping to introduce the defect; the prepared photocatalyst powder has the advantages of being fine in crystalline grain, low in cost, high in raw material powder utilization ratio, high in photocatalytic efficiency and the like.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy preparation, and particularly provides a method for preparing a copper-modified purple tungsten photocatalyst. Background technique [0002] With the increasingly serious energy and environmental problems, the pollution of organic matter to water resources is particularly prominent, which not only affects human health, but also requires a large amount of energy to eliminate such pollutants. Therefore, the development of new materials and the use of photocatalytic technology to solve pollution has become a new research direction. Discovered from Japan Honda and Fujishima through single crystal TiO 2 Electrodes can photocatalytically split water, and researchers continue to develop new and efficient catalyst materials. WO 3 ,TiO 2 , ZnO, Fe 2 o 3 A series of semiconductor oxides need to be modified when they are used as catalysts because the band gap energy does not match well with s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/888
Inventor 秦明礼陈鹏起陈铮刘烨曹知琴吴昊阳贾宝瑞曲选辉
Owner UNIV OF SCI & TECH BEIJING
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