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Method for preparing visible-light-active TiO2/Cu2S composite photocatalyst for removing Cr from water

A visible light and composite light technology, applied in catalyst activation/preparation, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of high photogenerated electron/hole recombination probability, limited application, poor visible light activity, etc. Low cost, good photocatalytic activity, good stability

Inactive Publication Date: 2016-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But due to TiO 2 It has some defects such as poor visible light activity and high probability of photogenerated electron / hole recombination, which seriously limits its practical application.

Method used

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  • Method for preparing visible-light-active TiO2/Cu2S composite photocatalyst for removing Cr from water
  • Method for preparing visible-light-active TiO2/Cu2S composite photocatalyst for removing Cr from water
  • Method for preparing visible-light-active TiO2/Cu2S composite photocatalyst for removing Cr from water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare 20mL of titanium tetrachloride ethanol solution of 0.45mol / L in a 100mL beaker, 2 S:TiO 2 The molar ratio is 0.008:1, and the industrial grade Cu with a mass percentage of 80% is added to the beaker 2 S; place the beaker in an ultrasonic cleaner for ultrasonic treatment for 60 minutes. Then, gradually drop 4mL of hydrolyzing agent into the obtained dispersion liquid (the percentage of each component of hydrolyzing agent accounted for the mass of hydrolyzing agent is: sodium hexametaphosphate 0.4%, glycerol 0.2%, ethanol 1%, all the other components are water), continue to sonicate for 10 minutes to promote the titanium tetrachloride (TiCl 4 ), the obtained product was transferred to a 25mL polytetrafluoroethylene substrate hydrothermal reaction kettle, and placed in a blast drying oven at a temperature of 140°C for heat treatment for 3 hours, and then naturally cooled to room temperature after heat treatment. Finally, the hydrothermal product is washed with d...

Embodiment 2

[0030] Prepare 20mL of 0.4mol / L titanium tetrachloride ethanol solution in a 100mL beaker, according to the 2 S:TiO 2 The molar ratio is 0.02:1, and the industrial grade Cu with a mass percentage of 80% is added to the beaker 2 S; place the beaker in an ultrasonic cleaner for ultrasonic treatment for 60 minutes. Then, gradually drop 4mL of hydrolyzing agent into the obtained dispersion liquid (the percentage of each component of hydrolyzing agent accounted for the mass of hydrolyzing agent is: sodium hexametaphosphate 0.4%, glycerol 0.2%, ethanol 1%, all the other components are water), continue to sonicate for 10 minutes to promote the titanium tetrachloride (TiCl 4 ), the resulting product was transferred to a 25mL polytetrafluoroethylene substrate hydrothermal reaction kettle, and placed in a blast drying oven at a temperature of 180°C for 3 hours. After the heat treatment, it was naturally cooled to room temperature. Finally, the hydrothermal product was washed with dei...

Embodiment 3

[0032] Prepare 20mL of 0.4mol / L titanium tetrachloride ethanol solution in a 100mL beaker, according to the 2 S:TiO 2 The molar ratio is 0.02:1, and the industrial grade Cu with a mass percentage of 80% is added to the beaker 2 S; place the beaker in an ultrasonic cleaner for ultrasonic treatment for 60 minutes. Then, gradually add 4mL of hydrolyzing agent dropwise in the obtained dispersion liquid (the percentage of each component of hydrolyzing agent accounting for the mass of hydrolyzing agent is: sodium hexametaphosphate 0.4%, glycerol 0.2%, ethanol 1%, all the other components are water), continue to sonicate for 10 minutes to promote the titanium tetrachloride (TiCl 4 ), the obtained product was transferred to a 25mL polytetrafluoroethylene substrate hydrothermal reaction kettle, and placed in a blast drying oven at a temperature of 140°C for 3 hours. After the heat treatment, it was naturally cooled to room temperature. Finally, the hydrothermal product was washed wi...

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Abstract

The invention discloses a method for preparing a visible-light-active TiO2 / Cu2S composite photocatalyst for removing Cr from water. According to the method, the TiO2 / Cu2S composite photocatalyst with high visible-light activity is prepared by adopting an ultrasonic assisted solvothermal method in a manner of taking titanium tetrachloride as a titanium source and taking cuprous sulfide as a composite modifier. During experimentation, a feasible and effective anti-coating coupling method is adopted and is assisted by an ultrasonic stripping means, so that the structural stability of the composite catalyst is guaranteed, and meanwhile, the composite catalyst can have relatively high photocatalytic activity to Cr(VI). The obtained TiO2 / Cu2S composite photocatalyst can be used for reducing a heavy metal Cr (VI) in the water into Cr (III), then, Cr (III) is converted into insoluble Cr(OH)3 which is attached to the surface of the catalyst, and thus, the aim of thoroughly purifying the water is achieved, so that the composite photocatalyst has a broad application prospect in the removal of similar heavy-metal pollutants from industrial water.

Description

technical field [0001] The invention relates to the field of preparation of visible light active nanocomposite materials, in particular to visible light active TiO used to remove Cr in water 2 / Cu 2 Preparation method of S composite photocatalyst. Background technique [0002] The problem of water pollution is becoming more and more serious, and the problem of water environment is getting more and more attention and attention. Heavy metals in industrial wastewater are one of the main water pollutants. Among them, Cr(VI) is highly toxic and carcinogenic. How to effectively convert Cr(VI) into Cr(III) has become a key issue in the treatment of Cr(VI) pollution. important means. Traditional treatment methods have certain limitations. As a new method, semiconductor photocatalysis technology has attracted extensive attention in the treatment of water pollutants. Among them, nano-TiO 2 It has the advantages of good photocatalytic performance, high stability, corrosion resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C02F1/30C02F101/22
CPCC02F1/30B01J27/04B01J37/10B01J37/343C02F2101/22C02F2305/10B01J35/39
Inventor 肖新颜张卫平
Owner SOUTH CHINA UNIV OF TECH
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