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Method for preparing titanium dioxide photocatalyst doped with sulphur and vanadium

A technology of titanium dioxide and photocatalyst, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc.

Inactive Publication Date: 2014-03-26
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there has been no report on TiO photocatalysts co-doped with sulfur and vanadium.

Method used

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  • Method for preparing titanium dioxide photocatalyst doped with sulphur and vanadium

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Experimental program
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Effect test

Embodiment 1

[0019] First, titanate (isopropyl titanate or tetrabutyl titanate) and organic solvent (isopropanol, or methanol, or ethanol, or acetone) were mixed and stirred for 2 hours as a titanium source, titanate and organic solvent The volume ratio is 1:4. Add citric acid and thiourea in deionized water in sequence, and stir for 2 hours as a sulfur source. The molar ratio of citric acid and titanate is 1.2:1, and the molar ratio of thiourea and titanate is 1:100. Add oxalic acid and ammonium metavanadate into deionized water, stir for 2 hours as a vanadium source, the molar ratio of oxalic acid and ammonium metavanadate is 2:1, and the molar ratio of ammonium metavanadate and titanate is 1:20. The above-mentioned sulfur source and vanadium source are mixed in a certain proportion to form a sulfur vanadium aqueous solution, and if necessary, a certain amount of deionized water is added to ensure that the volume of the mixed sulfur vanadium aqueous solution is fixed at 25 mL. The above...

Embodiment 2

[0022] First, titanate (isopropyl titanate or tetrabutyl titanate) and organic solvent (isopropanol, or methanol, or ethanol, or acetone) were mixed and stirred for 1 h as a titanium source, titanate and organic solvent The volume ratio is 1:4. Add citric acid and thiourea in deionized water in sequence, and stir for 1 h as a sulfur source. The molar ratio of citric acid and titanate is 1.2:1, and the molar ratio of thiourea and titanate is 1:20. Add oxalic acid and ammonium metavanadate into deionized water, stir for 2 hours as a vanadium source, the molar ratio of oxalic acid and ammonium metavanadate is 2:1, and the molar ratio of ammonium metavanadate and titanate is 1:50. The above-mentioned sulfur source and vanadium source are mixed in a certain proportion to form a sulfur vanadium aqueous solution, and if necessary, a certain amount of deionized water is added to ensure that the volume of the mixed sulfur vanadium aqueous solution is fixed at 25 mL. The above sulfur v...

Embodiment 3

[0025] First, titanate (isopropyl titanate or tetrabutyl titanate) and organic solvent (isopropanol, or methanol, or ethanol, or acetone) were mixed and stirred for 2 hours as a titanium source, titanate and organic solvent The volume ratio is 1:4. Add citric acid and thiourea in deionized water in sequence, and stir for 2 hours as a sulfur source. The molar ratio of citric acid and titanate is 1.2:1, and the molar ratio of thiourea and titanate is 1:10. Add oxalic acid and ammonium metavanadate into deionized water, stir for 2 hours as a vanadium source, the molar ratio of oxalic acid and ammonium metavanadate is 2:1, and the molar ratio of ammonium metavanadate and titanate is 1:50. The above-mentioned sulfur source and vanadium source are mixed in a certain proportion to form a sulfur vanadium aqueous solution, and if necessary, a certain amount of deionized water is added to ensure that the volume of the mixed sulfur vanadium aqueous solution is fixed at 25 mL. The above ...

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Abstract

The invention relates to a method for preparing titanium dioxide photocatalyst which is doped with sulphur and vanadium and has visible light activity. The method is characterized in that the photocatalyst is prepared according to a sol-gel method, and takes titanate, thiocarbamide, citric acid, ammonium metavanadate and oxalic acid as raw materials; a thiocarbamide and citric acid aqueous solution of a certain concentration is prepared into a sulphur source; an ammonium metavanadate and oxalic acid aqueous solution of a certain concentration is prepared into a vanadium source; the molar ratio between thiocarbamide and titanate is 1:100 to 1:5; the molar ratio between ammonium metavanadate and titanate is 1:100 to 1:20; the sulphur source and the vanadium source are added into a titanium source dropwise; the titanium source is stirred till the solution becomes green sol; after aging, the green sol becomes into gel and dried; the dried gel is roasted into the titanium dioxide photocatalyst doped with sulphur and vanadium. The method has the advantages that the process is simple; equipment requirement is low; the titanium dioxide photocatalyst prepared according to the method has high response under a visible light condition.

Description

technical field [0001] The invention relates to a preparation method of a titanium dioxide photocatalyst doped with sulfur and vanadium in a high temperature and normal pressure environment, and the preparation method can widen the visible light response range of the titanium dioxide photocatalyst. Background technique [0002] As a wide-bandgap semiconductor, titanium dioxide is widely used in the fields of atmospheric and water environment pollutant degradation, antibacterial, deodorization and self-cleaning due to its stable chemical properties and efficient photocatalytic activity. However, the band gap of titanium dioxide (anatase type) is 3.2eV, the absorption wavelength is less than 388nm, and the absorption band is in the ultraviolet region, which seriously restricts its practical application in photocatalysis and other aspects. Doping titanium dioxide with carbon, fluorine, nitrogen, sulfur, vanadium, iron, nickel and other non-metallic elements or transition metals...

Claims

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Application Information

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IPC IPC(8): B01J27/02
Inventor 王婷董亚梅何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH