Photocatalyst of zinc oxide possessing visible light activity and preparation method

A zinc oxide and catalyst technology, which is applied in the field of zinc oxide photocatalyst and its preparation, can solve the problem of photocatalyst loss of activity, achieve the effects of enriching research and application content, promoting development, and being easy to implement

Inactive Publication Date: 2005-08-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] One: TiO 2 Dye photosensitization of photocatalysts, sensitization requires TiO 2 Adsorb dyes, however, they are difficult to be

Method used

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  • Photocatalyst of zinc oxide possessing visible light activity and preparation method
  • Photocatalyst of zinc oxide possessing visible light activity and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0019] Example 1

[0020] In the flask of 500ml, add 1.0g zinc acetate dihydrate, 5g polyvinylpyrrolidone (molecular weight 20,000), be dissolved in ethylene glycol respectively and mix homogeneously, wherein the weight ratio of zinc acetate dihydrate and polyvinylpyrrolidone is 0.2: 1, The weight ratio of ethylene glycol to zinc acetate dihydrate is 300:1; heat up to 140°C under strong stirring, condense and reflux for 5 hours, separate the precipitate by suction filtration while it is hot, wash with absolute ethanol three times, and dry at 120°C 30min, and finally roasted at 300°C to obtain zinc oxide with visible light activity.

Example Embodiment

[0021] Example 2

[0022] Add 1.0g of zinc acetate dihydrate and 2.0g of polyvinylpyrrolidone (molecular weight: 30,000) into a 500ml flask, dissolve them in ethylene glycol and mix well, wherein the weight ratio of zinc acetate dihydrate to polyvinylpyrrolidone is 0.5:1 , the weight ratio of ethylene glycol to zinc acetate dihydrate is 200:1; start to heat up to 195°C under vigorous stirring, condense and reflux for 3 minutes, separate the precipitate by suction filtration while it is hot, wash with absolute ethanol 3 times, and heat up to 120°C Drying for 30 minutes, and finally calcination at 600°C, to obtain zinc oxide with visible light activity.

Example Embodiment

[0023] Example 3

[0024] Add 1.0g of zinc acetate dihydrate and 0.25g of polyvinylpyrrolidone (molecular weight: 60,000) into a 500ml flask, dissolve them in ethylene glycol and mix well, wherein the weight ratio of zinc acetate dihydrate to polyvinylpyrrolidone is 4:1 , the weight ratio of ethylene glycol to zinc acetate dihydrate is 50:1; start to heat up to 200°C under strong stirring, condense and reflux for 1 hour, separate the precipitate by suction filtration while it is hot, wash with absolute ethanol three times, 120°C Dry for 30 minutes, and finally bake at 700°C to obtain zinc oxide with visible light activity.

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Abstract

A zinc oxide photocatalyst with visual light activity is prepared through dissolving dihydrated zinc acetate and polyvinyl pyrrolidone respectively in ethanediol, mixing, stirring and heating while reflux. Under action of visual light, it has high degradating rate to methyl orange (increased by more than 2 times).

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a zinc oxide photocatalyst with visible light activity and a preparation method thereof. Background technique [0002] Since the discovery of TiO by Fujishima and Honda in 1972 2 Since single crystal electrodes can not only decompose water but also decompose other substances under the action of light, photocatalytic reactions have received widespread attention in environmental governance and energy development. The research and development of photocatalytic materials has become a hot research topic at home and abroad. . However, most of the reported photocatalytic efficiency is low, the band gap is wide, and they can only show photochemical activity in the ultraviolet region. However, in the solar spectrum, ultraviolet light (below 400nm) is less than 5%, while visible light with a wavelength of 400-750nm accounts for 43%. If the photocatalyst cann...

Claims

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Application Information

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IPC IPC(8): B01J23/06B01J37/03
Inventor 彭峰陈水辉王红娟张雷
Owner SOUTH CHINA UNIV OF TECH
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