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High visible-light catalytic activity material for BiOCl/ZnO heterojunction and preparation method thereof

A catalytically active material and visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as limited contact area of ​​semiconductors, separation of photogenerated electron-hole pairs, and hindered transfer rate

Inactive Publication Date: 2018-06-01
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Therefore, in order to improve the photocatalytic performance of catalysts, constructing heterojunctions is a very effective method. At present, most heterostructures are constructed by synthesizing a semiconductor and then loading it onto another semiconductor by precipitation, high-temperature calcination, etc. On semiconductors, the contact area between semiconductors is limited, and the separation and transfer rate of photogenerated electron-hole pairs are hindered

Method used

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  • High visible-light catalytic activity material for BiOCl/ZnO heterojunction and preparation method thereof
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  • High visible-light catalytic activity material for BiOCl/ZnO heterojunction and preparation method thereof

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Experimental program
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Embodiment

[0041] refer to figure 1, a preparation method of a BiOCl / ZnO heterojunction highly visible light catalytic active material, comprising the steps of:

[0042] 1) Bi(NO 3 ) 3 • 5H 2 O was dissolved in deionized water, stirred evenly, and nitric acid was added dropwise therein to form a clear solution A;

[0043] 2) The crystallized SnCl 4 Dissolve in deionized water, stir evenly, and make solution B;

[0044] 3) Mix solution A and solution B according to the molar ratio of Bi:Sn=(0.5-2):1, stir evenly, a white suspension will form during the stirring process, add nitric acid dropwise, and make a clear mixture C ;

[0045] 4) Add hexamethylenetetramine aqueous solution dropwise to the mixed solution C, and continue to stir for 90 minutes to produce a white precipitate, and the reaction product is suction filtered, washed, dried, cooled and ground to obtain flower-shaped BiOCl crystals;

[0046] 5) Dissolve zinc acetate hexahydrate and hexamethylenetetramine in different d...

example 1

[0058] Example 1, prepare pure BiOCl when the molar ratio is Bi:Sn=0.5:1:

[0059] Take 10mmol Bi(NO 3 ) 3 • 5H 2 O was dissolved in 100mL deionized water, stirred evenly, and then 1mL nitric acid was added dropwise to it every 5 minutes until a clear solution A was formed; 20mmol crystalline SnCl 4 Dissolve in 100mL deionized water, stir well to make solution B; then stir and mix solution A and solution B evenly, a white suspension will be formed during the stirring process, continue to add 1mL nitric acid every 5 minutes until clear Mixed solution C: Dissolve 2 mmol of hexamethylenetetramine in 400 mL of deionized water to form solution I. After the solution of solution I is complete, add it to mixed solution C, and keep stirring for 90 min to produce a large amount of white precipitate. The resulting product Suction filtration, repeated washing with deionized water and absolute ethanol three to five times, and finally drying at 60°C for 12 hours; cooling and grinding to ...

example 2

[0060] Example 2, preparing pure BiOCl when the molar ratio is Bi:Sn=1:1:

[0061] Take 10mmol Bi(NO 3 ) 3 • 5H 2 O was dissolved in 100mL deionized water, stirred evenly, and then 1mL nitric acid was added dropwise to it every 5 minutes until a clear solution A was formed; 10mmol crystalline SnCl 4 Dissolve in 100mL deionized water, stir well to make solution B; then stir and mix solution A and solution B evenly, a white suspension will be formed during the stirring process, continue to add 1mL nitric acid every 5 minutes until clear Mixed solution C: Dissolve 2mmol hexamethylenetetramine in 400mL deionized water to make solution I. After the solution I solution is complete, add it to mixed solution C and keep stirring for 90min to produce a large amount of white precipitate. Pump the resulting product Filter, wash with deionized water and absolute ethanol three to five times, and finally dry at 60°C for 12 hours; cool and grind to obtain a powder that is pure BiOCl.

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Abstract

The invention discloses a high visible-light catalytic activity material for a BiOCl / ZnO heterojunction and a preparation method thereof. The method comprises the steps of (1) preparing a solution A;(2) preparing a solution B; (3) mixing the solution A and the solution B to prepare into mixed liquor C; (4) dropwise adding a hexamethylenetetramine water solution into the mixed liquor C to obtain aflower-shaped BiOCl crystal; (5) respectively dissolving zinc acetate hexahydrate and hexamethylenetetramine into different deionized water to prepare into a solution I and a solution II; (6) mixingthe solution I and the solution II to form mixed liquor III; (7) uniformly mixing the mixed liquor III and BiOCl micro powder, reacting for 6 hours at 80 DEG C to 100 DEG C, naturally cooling after reaction, and washing, drying, cooling and grinding a product to obtain the high visible-light catalytic activity material for the BiOCl / ZnO heterojunction. The method is short in reaction time, mild inreaction condition and simple to operate. The BiOCl / ZnO heterojunction prepared through the method can absorb visible light, has photocatalytic activity of degrading rhodamine B under visible light,and has the characteristic of good photochemical stability.

Description

technical field [0001] The invention relates to a photocatalytic active material, in particular to a BiOCl / ZnO heterojunction highly visible photocatalytic active material and a preparation method thereof. Background technique [0002] With the development of the dye industry, its production wastewater has become one of the most serious sources of water pollution, and volatile organic compounds have also brought serious threats to our health. Among various technologies for effectively removing pollutants in the air, photocatalytic oxidation technology has attracted great attention as an environmentally friendly technology and has potential applications in harnessing abundant solar energy. Therefore, how to efficiently and conveniently utilize, convert and store solar energy is the goal of many scientific researchers. [0003] ZnO is a semiconductor material with photocatalytic activity. It is low in cost, and its forbidden band width is 3.37 eV at room temperature, its exci...

Claims

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Application Information

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IPC IPC(8): B01J27/138C02F1/30C02F101/38
CPCC02F1/30B01J27/138C02F2101/38C02F2305/10B01J35/39
Inventor 钟燕常鋆青胡朝浩李一凡朱迪安慧婷
Owner GUILIN UNIV OF ELECTRONIC TECH
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