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Method for degrading methyl orange dye wastewater with ZnIn2S4 visible light catalyst

A dye wastewater, znin2s4 technology, applied in chemical instruments and methods, light water/sewage treatment, water pollutants, etc., can solve the problems of high cost, high energy consumption, and long time to degrade wastewater, and achieve short time and energy consumption Effects of small, mild preparation conditions

Inactive Publication Date: 2011-05-25
DALIAN MARITIME UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The visible light catalyst preparation and wastewater degradation method described in the published literature has high cost, high energy consumption, long time to degrade wastewater, and does not target ZnIn 2 S 4 Visible light catalyst degradation method of methyl orange dye wastewater

Method used

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  • Method for degrading methyl orange dye wastewater with ZnIn2S4 visible light catalyst
  • Method for degrading methyl orange dye wastewater with ZnIn2S4 visible light catalyst
  • Method for degrading methyl orange dye wastewater with ZnIn2S4 visible light catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Accurately weigh 0.25mmol Zn(NO 3 ) 2 ·6H 2 O, 0.5mmol In(NO 3 ) 3 4.5H 2 0 and 1.5mmol of thioacetamide were put into a 50mL polytetrafluoroethylene liner, accurately pipette 15mL of deionized water as a solvent with a pipette gun, and obtained a colorless and clear solution after magnetic stirring for 40min, sealed a stainless steel reaction vessel, and React at 90°C for 16h. Cool, wash, and dry to obtain a yellow powder. The yellow powder was subjected to 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 microspherical or irregular, with a particle size of 20um-100um.

[0030] Accurately pipette 250mL methyl orange dye wastewater and place it in a glass reactor with a volume of 250mL. Add 0.1g ZnIn 2 S 4 Particle powder, the reaction system was placed in a dark room, and stirred for 1 h i...

Embodiment 2

[0032] Repeat Example 1, change the synthetic temperature to be 70 DEG C, other conditions are constant, the product obtained is through X-ray powder diffraction (attached image 3 ) identified as hexagonal ZnIn 2 S 4 . The reaction results are: after 1 hour of light, the degradation rate of methyl orange is 43.1%; after 2 hours of light, the degradation rate is 79.8%; after 2.5 hours of light, the degradation rate is 93.5%; after 3 hours of light, it is completely degraded.

Embodiment 3

[0034] Repeat Example 1, change synthesis temperature to be 55 ℃, other conditions are constant, gained product is through X-ray powder diffraction (attached Figure 4 ) identified as hexagonal ZnIn 2 S 4 , the morphology was examined by scanning electron microscope (attached Figure 5 ) are characterized as being microspherical or irregular. The reaction results are: after 0.5h of light, the degradation rate of methyl orange is 51.3%; after 1h of light, the degradation rate is 83.5%; after 1.5h of light, it is completely degraded.

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Abstract

The invention discloses a method for degrading methyl orange dye wastewater with a ZnIn2S4 visible light catalyst. The method comprises the following steps: using zinc salt, indium salt and sulfur source as reaction materials; dissolving the materials in a de-ionized water solution according to a stoichiometric ratio; starting a hydrothermal reaction at the temperature of 30-90 DEG C to obtain ZnIn2S4 visible light catalyst powders; moving the prepared methyl orange solution into a self-prepared glass reaction vessel; adding the prepared ZnIn2S4 powders; placing the reaction system in a dark room and stirring for 20-60 minutes in dark; stirring for 1-4 hours under visible light; and determining that the methyl orange is fully degraded after being separated by high speed centrifugation. By using the method provided by the invention, the methyl orange solution can be degraded efficiently at room temperature and under normal pressure, conditions of the degradation process in the method can be easily controlled, the process is simple and is easy to learn and operate, the time required for complete degradation is short, and the energy consumption is low.

Description

technical field [0001] The present invention relates to the degradation method of dye wastewater, specifically a kind of ZnIn 2 S 4 Visible light catalyst degradation method of methyl orange dye wastewater. Background technique [0002] Most of the chemicals produced in the world are composed of synthetic textile dyes and other industrial dyes, and in all these dyes, azo dyes and fluorone dyes are two important components. Some azo dyes (eg methyl orange) and fluorone dyes (eg rhodamine B) are known to be highly carcinogenic. Therefore, with the increasingly stringent requirements of international environmental standards, key technologies for efficiently degrading these dyes are urgently needed. At present, heterogeneous photocatalytic oxidation technology is widely used to degrade soluble dyes in wastewater. According to the division of available light sources, the heterogeneous photocatalytic oxidation technology can be roughly divided into two types, one uses ultravio...

Claims

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Application Information

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IPC IPC(8): B01J23/08C02F1/30C02F1/32C02F101/38
Inventor 郭明星尹淑慧
Owner DALIAN MARITIME UNIVERSITY
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