Nanometer zinc oxide-bismuth oxide composite photocatalyst with visible light response and preparation method thereof

A technology of nano-zinc oxide and photocatalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., to improve catalytic performance, improve adsorption performance, and improve photocatalysis active effect

Active Publication Date: 2012-07-18
江苏中来新材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on ZnO-BiO composite photocatalysts.

Method used

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  • Nanometer zinc oxide-bismuth oxide composite photocatalyst with visible light response and preparation method thereof
  • Nanometer zinc oxide-bismuth oxide composite photocatalyst with visible light response and preparation method thereof
  • Nanometer zinc oxide-bismuth oxide composite photocatalyst with visible light response and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] Implementation Example 1: The preparation method of the nanometer zinc oxide-bismuth oxide composite photocatalyst of visible light response of the present invention comprises the following steps:

[0020] Stir and dissolve zinc nitrate, bismuth nitrate and urea in water respectively, the mol ratio of zinc nitrate, bismuth nitrate and urea is 1: 0.02: 1.10, the mixed solution carries out co-precipitation reaction, the reaction temperature is 90 ℃, and the reaction time is 8 hours, The obtained product was separated by centrifugation, washed with deionized water, dried at 60° C. for 12 hours, and calcined at 300° C. for 3 hours to obtain a nanometer zinc oxide-bismuth oxide composite.

[0021] Characterized by X-ray diffraction (XRD), the obtained product is wurtzite zinc oxide (JCPDS, 36-1451), compared with nano-zinc oxide, the characteristic peak of zinc oxide in nano-zinc oxide-bismuth oxide composite sharper, indicating that the addition of bismuth oxide increases t...

Embodiment 2

[0022] Implementation example 2: The preparation method of the nanometer zinc oxide-bismuth oxide-graphene oxide composite photocatalyst of visible light response of the present invention, comprises the following steps:

[0023] The first step is the preparation of graphite oxide. Graphite oxide is prepared by oxidizing graphite with strong oxidizing agents such as nitric acid and sulfuric acid.

[0024] In the second step, 50 mg of graphite oxide was ultrasonically dispersed in 100 mL of deionized water for 2 hours to prepare a graphene oxide dispersion.

[0025] In the third step, water-soluble zinc chloride, bismuth nitrate and urea are stirred and dissolved in water respectively, the molar ratio of zinc chloride, bismuth nitrate and urea is 1: 0.02: 1.10, and the mixed solution carries out co-precipitation reaction, and the reaction temperature is 90 °C, the reaction time is 8 hours, the obtained product is centrifuged, washed with deionized water, dried at 60 °C for 12 h...

Embodiment 3

[0027] Implementation example 3: The preparation method of the nanometer zinc oxide-bismuth oxide-graphene oxide composite photocatalyst of visible light response of the present invention, comprises the following steps:

[0028] The first step is the same as Step 1 in Implementation Example 2.

[0029] In the second step, 100 mg of graphite oxide was ultrasonically dispersed in 100 mL of deionized water for 2 hours to prepare a graphene oxide dispersion.

[0030] The third step is to stir and dissolve zinc sulfate, bismuth nitrate and urea in water respectively. The molar ratio of zinc sulfate, bismuth nitrate and urea is 1:0.10:1.10, and the mixed solution is subjected to coprecipitation reaction. The reaction temperature is 93°C, and the reaction time is After 9 hours, the obtained product was centrifuged, washed with deionized water, dried at 60° C. for 12 hours, and calcined at 500° C. for 3 hours to obtain a nano-zinc oxide-bismuth oxide composite.

[0031] The fourth st...

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Abstract

The invention relates to a nanometer zinc oxide-bismuth oxide composite photocatalyst with visible light response and a preparation method thereof. The composite is formed by compounding nanometer zinc oxide, bismuth oxide and graphene oxide at a mass ratio of 1: 0.05-1: 0-2. The preparation method comprises the steps of: respectively adding water-soluble zinc salts, bismuth salts and urea in an aqueous solution; after a co-precipitation reaction, centrifuging, washing, drying and roasting products; then placing the reaction products in an ultrasonically dispersed grapheme oxide aqueous solution to be heated and stirred for a reaction; after the reaction is finished, centrifuging, washing and drying the products to obtain the zinc oxide-bismuth oxide composite photocatalyst. The zinc oxide-bismuth oxide composite photocatalyst disclosed by the invention has better application prospect and economic benefits in the aspect of sewage treatment.

Description

technical field [0001] The invention relates to a nano zinc oxide-bismuth oxide composite photocatalyst responding to visible light and a preparation method thereof. Background technique [0002] As the problem of global environmental degradation becomes more and more prominent, the effective control and governance of environmental pollution has become a major problem that needs to be solved urgently. As an efficient, green and non-polluting environmental treatment technology, photocatalysis has attracted widespread attention from scientists. [0003] Zinc oxide has been extensively studied as a high-efficiency semiconductor photocatalyst with a band gap of 3.36eV, but it only responds to ultraviolet light. From the perspective of fully utilizing solar energy, a catalyst with high-efficiency photocatalytic activity under visible light is prepared. has great practical significance. However, there is no report about ZnO-B2O composite photocatalysts. Contents of the inventi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18
Inventor 陈海群黄静何光裕施健付永胜李丹孙小强汪信
Owner 江苏中来新材科技有限公司
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