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Method for preparing ZnIn2S4 visible-light activated photocatalyst at low temperature

A znin2s4, visible light technology, applied in chemical instruments and methods, physical/chemical process catalysts, general water supply conservation, etc., can solve the problems of high carcinogenicity, etc., and achieve the effect of easy implementation, simple equipment and process, and mild reaction conditions

Inactive Publication Date: 2011-10-19
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some azo dyes (e.g. methyl orange) and fluorone dyes (e.g. rhodamine B) are known to be highly carcinogenic

Method used

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  • Method for preparing ZnIn2S4 visible-light activated photocatalyst at low temperature
  • Method for preparing ZnIn2S4 visible-light activated photocatalyst at low temperature
  • Method for preparing ZnIn2S4 visible-light activated photocatalyst at low temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Accurately weigh 0.25mmol Zn(NO 3 ) 2 ·6H 2 O, 0.5mmol In(NO 3 ) 3 ·4.5H 2 Put O and 1.5mmol of thioacetamide into a 50mL PTFE liner, use a pipette to accurately pipette 15mL of deionized water as a solvent, and magnetically stir for 40 minutes to obtain a colorless and clear solution. Seal the stainless steel reactor. React at 70°C for 16h. After cooling, it was washed three times with absolute ethanol and deionized water, and dried overnight at room temperature to obtain a yellow powder. The yellow powder was X-ray powder diffraction (attached figure 1 )Identified as hexagonal ZnIn 2 S 4 , And there are no impurities in the product. The morphology was characterized by scanning electron microscopy (attached figure 2 ) Is a microsphere or irregular shape, with a particle size of 20um-100um.

[0026] Accurately pipette 250mL methyl orange dye wastewater into a glass reactor with a volume of 250mL. Add 0.1g ZnIn 2 S 4 For particle powder, the reaction system is placed in...

Embodiment 2

[0028] Repeat Example 1, with other conditions unchanged, and change the reaction time to 8h. The resulting product was X-ray powder diffraction (attached image 3 )Identified as hexagonal ZnIn 2 S 4 . The reaction results of the degradation of methyl orange wastewater were: after 1h of light, the degradation rate of methyl orange was 43.1%; after 2h of light, the degradation rate was 79.8%; after 2.5h of light, the degradation rate was 93.5%; after 3h of light, it was completely degraded.

Embodiment 3

[0030] Repeat Example 1, with other conditions unchanged, and change the reaction temperature to 55°C. The resulting product was X-ray powder diffraction (attached Figure 4 )Identified as hexagonal ZnIn 2 S 4 , Morphology by scanning electron microscope (attached Figure 5 ) Is characterized by microspheres or irregularities. The reaction results of the degradation of methyl orange wastewater were: after 0.5h of light, the degradation rate of methyl orange was 51.3%; after 1h of light, the degradation rate was 83.5%; after 1.5h of light, it was completely degraded.

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Abstract

The invention relates to a method for preparing a visible light photocatalyst, specifically to a method for preparing a ZnIn2S4 visible-light activated photocatalyst at low temperature. The preparation method provided by the invention comprises the following steps of: adding zinc salt, indium salt and a sulfur source according to mol ratio into deionized water with uniformly mixing, placing the mixed solution into a reaction vessel, performing a hydrothermal reaction at the temperature of 30-80 DEG C; cooling, centrifuging, washing the precipitate with anhydrous ethanol and deionized water; drying to obtain the ZnIn2S4 visible-light activated photocatalyst powder. According to the invention, the ZnIn2S4 visible-light activated photocatalyst is synthesized at low temperature by using deionized water as the solvent without the addition of any other solvent, a surfactant or a template. The method provided by the invention needs mild condition as well as simple equipment and technology, and is easy to accomplish. The prepared material has a great industrial application prospect in the fields of photocatalysis, solar cells, wastewater degradation and the like.

Description

Technical field [0001] The invention relates to a method for preparing a visible light catalyst, in particular to a method for preparing ZnIn at a low temperature of 30°C to 80°C 2 S 4 Visible light catalyst method. Background technique [0002] Most of the chemicals produced in the world are composed of synthetic textile dyes and other industrial dyes. Among all these dyes, azo dyes and fluorone dyes are two important components. It is well known that some azo dyes (such as methyl orange) and fluorone dyes (such as rhodamine B) are highly carcinogenic. Therefore, with the increasingly stringent requirements of international environmental standards, there is an urgent need for key technologies to efficiently degrade these dyes. At present, heterogeneous photocatalytic oxidation technology is widely used to degrade soluble dyes in wastewater. According to the available light sources, the heterogeneous photocatalytic oxidation technology can be roughly divided into two types, one...

Claims

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Application Information

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IPC IPC(8): B01J27/04C02F1/30C02F1/461C02F1/58
CPCY02A20/212Y02W10/37
Inventor 郭明星尹淑慧
Owner DALIAN MARITIME UNIVERSITY
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