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Preparation method for high-efficiency amorphous ZnO/AgCl composite visible light photocatalyst

A photocatalyst, amorphous technology, used in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., to achieve the effect of low cost, high photocatalytic activity, and enhanced photocatalytic performance

Inactive Publication Date: 2015-10-07
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, to the best of our knowledge, there is no report on surface modification of silver-based compound photocatalytic materials using amorphous ZnO (denoted as a-ZnO) to enhance the photocatalytic activity of silver-based compound catalysts.

Method used

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  • Preparation method for high-efficiency amorphous ZnO/AgCl composite visible light photocatalyst
  • Preparation method for high-efficiency amorphous ZnO/AgCl composite visible light photocatalyst
  • Preparation method for high-efficiency amorphous ZnO/AgCl composite visible light photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation process of amorphous ZnO-modified AgCl composite high-efficiency visible light photocatalyst is as follows: 1) Preparation of AgCl powder: under stirring, 34.9 mL of 0.1 mol / L silver nitrate solution was added dropwise to 34.9 mL of 0.1 mol / L chlorine In potassium chloride solution, after reacting for 15 minutes, the resulting product was washed 3 times with deionized water to obtain AgCl powder; 2) Modification of amorphous ZnO on the surface of AgCl powder: take 0.5g AgCl powder and add it to 1ml with a concentration of 7.36× 10 -2 mol / L Zn(NO 3 ) 2 solution and 100ml of urea solution with a concentration of 0.5mol / L, heated to 90°C while stirring, and then stirred for 60min; 3) Light pretreatment: Filter the obtained AgCl powder and wash it with deionized water for 3 times, then add it to 10mL of formazan In base orange solution (20 mg / L), irradiate for 30 min under a xenon lamp that filters out ultraviolet light; 4) Wash the obtained precipitate th...

Embodiment 2

[0041] In order to test the effect of a-ZnO content on the photocatalytic performance of a-ZnO / AgCl composite visible light photocatalyst, in addition to different a-ZnO content, other reaction conditions such as soaking and stirring reaction temperature (90°C) and time (60min), drying temperature (60°C) and drying time (3h) etc. are all the same as in Example 1. The results show that when the content of a-ZnO is 0.1, 0.25, 0.5, 1, 5 and 10wt%, the obtained a-ZnO / AgCl composite visible light photocatalyst has degradation rate constants of methyl orange of 0.0289, 0.0309, 0.0594, 0.0574, 0.0342 and 0.0315min -1 . The main reason is that when the content of a-ZnO is 0.1-0.25wt%, because the content of a-ZnO is too low, only a small amount of a-ZnO is compounded on the surface of AgCl powder, which makes the photocatalytic performance of a-ZnO / AgCl lower ; When the content of a-ZnO is 0.25-1wt%, because a-ZnO can be well compounded on the surface of AgCl powder, it shows signif...

Embodiment 3

[0043] In order to test the effect of soaking and stirring temperature on the photocatalytic performance of a-ZnO / AgCl composite visible light photocatalyst, in addition to different soaking and stirring temperatures, other reaction conditions such as amorphous a-ZnO content (0.5wt%), soaking and stirring time (60min) , drying temperature (60°C) and drying time (3h) etc. are all the same as in Example 1. The results showed that when the immersion and stirring temperatures were 20, 50, 70, 90°C and 95°C, the degradation rate constants of the obtained a-ZnO / AgCl composite visible light photocatalyst for methyl orange were 0.0258, 0.0389, 0.0509, 0.0594 and 0.0436min -1 . The main reason is that when the soaking and stirring temperature is low (20-50°C), urea cannot be fully hydrolyzed, and the amount of amorphous a-ZnO generated by reacting with zinc nitrate is very small, and a-ZnO cannot be well combined with AgCl particles ;When soaking and stirring temperature is 70-90℃, u...

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Abstract

The invention relates to a preparation method for a high-efficiency amorphous ZnO / AgCl composite visible light photocatalyst. The method comprises the following steps: (1) reacting a AgNO3 solution and a KCl solution to obtain a AgCl powder body as a photocatalyst raw material; (2) dissolving zinc nitrate in deionized water to obtain a uniform zinc nitrate solution, and dissolving urea in the deionized water to obtain a uniform urea solution; (3) adding the AgCl powder body into the zinc nitrate solution and the urea solution, soaking and stirring to obtain a product; (4) filtering the product, washing by the deionized water, adding a methyl orange solution, and radiating in visible light; and (5) filtering a precipitate obtained in the step (4), washing by the deionized water, and drying under a vacuum condition so as to obtain the high-efficiency amorphous ZnO / AgCl composite visible light photocatalyst. The method has the beneficial effects that the operation is easy, and needed raw materials are green and easily available; a prepared photocatalytic material has the high-efficiency visible light photocatalytic performance, and can be used for effectively degrading organic pollutants.

Description

technical field [0001] The invention relates to a preparation method of an efficient amorphous ZnO / AgCl composite visible light photocatalyst. technical background [0002] At present, water pollution has attracted people's attention because it is closely related to daily life. Among them, organic matter has long-term pollution to water bodies, and has trace and long-term harm to human and livestock bodies. Therefore, the treatment of organic matter pollution in water has become particularly important. Traditional treatment methods have high investment costs, high selectivity to organic matter, incomplete degradation, and easy to generate a large amount of sludge, causing secondary pollution. Photocatalytic technology has the functions of photodegradation of organic pollutants and photoreduction of carbon dioxide. Therefore, photocatalysis plays an important role in solving These environmental problems have important application prospects. Recently, silver-based compounds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/138
Inventor 余火根王苹丁俊杰王雪飞余家国
Owner WUHAN UNIV OF TECH
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