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Supported type titanium dioxide visible light photocatalyst

A photocatalyst, titanium dioxide technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve conduction band electron deactivation, light absorption range limitation, quantum Problems such as low yield

Inactive Publication Date: 2008-07-09
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0003] However, the forbidden band width of titanium dioxide is 3.2eV, and the light absorption range is limited to the ultraviolet region (wavelength <380nm)
But this part of the light is still less than 5% of the total energy of the sun's rays on the ground, thus greatly limiting its utilization of solar energy.
In addition, the quantum yield of the photocatalytic reaction of titanium dioxide is low, because the excited state valence band holes and conduction band electrons are easily recombined after being irradiated by light, resulting in deactivation.

Method used

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  • Supported type titanium dioxide visible light photocatalyst

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preparation example Construction

[0013] Taking doping metal vanadium (V) and supporting metal platinum (Pt) as examples, the method for preparing the titanium dioxide photocatalyst mentioned in the present invention is described. Said preparation method comprises the steps:

[0014] (1) Mix alkyl titanate and absolute ethanol to obtain mixture A; mix ethanol, water, vanadium chloride or vanadium nitrate and nitric acid to obtain mixture B. Add the mixture A dropwise to the continuously stirred mixture B at a rate of 3-4 drops / second. After the dropwise addition, keep at 20°C-40°C for 3-5 hours to obtain a transparent sol. The obtained sol is placed at 20° C. to 60° C. for 1 to 2 days to obtain a wet gel. The obtained wet gel is subjected to hydrothermal crystallization (the temperature of hydrothermal crystallization is 100° C. to 240° C. and the time is 5 to 30 hours), washed and dried to obtain metal vanadium-doped nano-titanium dioxide.

[0015] Wherein, said alkyl titanate is tetrabutyl titanate, isopr...

Embodiment

[0021] Preparation of transition metal doped and noble metal supported nano titanium dioxide:

[0022] Mix 6ml tetrabutyl titanate and 17ml absolute ethanol to obtain solution A; mix 34ml absolute ethanol, 0-1.6ml water, 1.6-0ml 0.1175M vanadium chloride solution (vanadium chloride solution+water=1.6ml), Mix 0.4ml of nitric acid to prepare solution B, then add A dropwise at a rate of 3d / s into solution B which is constantly being stirred, after the dropwise addition, continue to react for 0.5 hours to obtain a transparent sol, and transfer the sol to a 40°C water bath Gel in the pot for 24 hours, then transfer the wet gel directly into a polytetrafluoroethylene-lined autoclave for hydrothermal crystallization at 180°C for 10 hours. Then the precipitate was washed with deionized water until neutral, and then dried in an infrared oven for 12 hours to obtain a vanadium-doped titanium dioxide sample. Change the amount of vanadium chloride added to prepare titanium dioxide with di...

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Abstract

The invention relates to a titanium dioxide photocatalyst with photocatalytic activity of visible light. The titanium dioxide photocatalyst is a load catalyst with one nano titanium dioxide in metals in I B to ó¸B and ó° of the doping element periodic table as the active component, and one of the metals in I B to ó¸B and ó° of Period 5 and 6 in the element periodic table as the carrier. The titanium dioxide photocatalyst prepared by the invention has quite high quantum yield of titanium dioxide photocatalytic reaction and wider light response range (i.e. ''red shift'' of the light response range), which lays foundation for the titanium dioxide photocatalytic technology to enter into the stage of practicality.

Description

technical field [0001] The present invention relates to a kind of titanium dioxide (TiO 2 ) photocatalyst, specifically, a TiO with visible light photocatalytic activity 2 catalyst of light. Background technique [0002] Photocatalytic technology is a new environmental protection technology gradually developed in the 1970s. It utilizes the characteristic that the surface of semiconductor oxide materials can be activated under light, and can effectively oxidize and decompose organic matter, reduce heavy metal ions, kill bacteria and eliminate odors by using light energy. Because of its simple operation, it only needs to be carried out at normal temperature and pressure; it can completely destroy the pollutants in the air and water, make them completely mineralized into harmless substances such as carbon dioxide and water, and avoid secondary pollution. Green environmental governance technology with broad application prospects. At present, most of the heterogeneous photoca...

Claims

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Application Information

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IPC IPC(8): B01J21/06B01J23/648
Inventor 张金龙肖玲吴咏梅王文娇陈锋
Owner EAST CHINA UNIV OF SCI & TECH
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