Preparation method for titanium dioxide doping 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 the high recombination rate of photogenerated carriers, restricting the application of titanium dioxide, Solve the problems of low utilization rate of sunlight and achieve the effect of not harsh process conditions, low equipment requirements and wide application range

Inactive Publication Date: 2009-02-18
EAST CHINA NORMAL UNIV
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Problems solved by technology

Dye wastewater in various wastewater to be treated is difficult to be degraded by previous chemical and biological methods. At present, photocatalysis is widely used in the treatment of dye wastewater. As a photocatalyst, titanium dioxide has stable chemical properties and is cheap and easy to obtain. , non-toxic and other advantages, but titanium dioxide also has some defects, such as: wide energy band, can only absorb ultraviolet light, low utilization rate of sunlight, high recombination rate of photogenerated carriers, and low photocatalytic efficiency; these defects Seriously restrict the practical application of titanium dioxide

Method used

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  • Preparation method for titanium dioxide doping photocatalyst

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] a. Mix 30ml of tetra-n-butyl titanate and 20ml of absolute ethanol at room temperature, and stir for 40min to obtain a uniform and transparent yellow solution 1.

[0019] b. At room temperature, 0.2983g Ni(CH 3 COO) 2 .4H 2 O was dissolved in 10ml of absolute ethanol to form a green solution 2, which was added to solution 1 and stirred for 2h.

[0020] c. Slowly drop the acetic acid solution with pH=3 into the above mixed solution under stirring until a gel is formed.

[0021] d. The gel is dried in an oven at 80° C. to obtain a dry gel, which is ground into a powder.

[0022] e. Mix 0.8007 g of the above powder with 0.6002 g of urea, and calcinate at 400° C. for 6 hours to obtain a nitrogen-nickel co-doped titanium dioxide photocatalyst.

[0023] f, get above-mentioned photocatalyst 0.1130g, 113ml of isatin solution of 10mg / L joins in reaction container, dark reaction 1h, light source is the tungsten halogen lamp (simulation sunlight) of 500W, after illumination 70...

Embodiment 2

[0025] a. Mix 30ml of tetra-n-butyl titanate and 20ml of absolute ethanol at room temperature, and stir for 20min to obtain a uniform and transparent yellow solution 1.

[0026] b. Add 0.2563g Ni(NO 3 ) 2 .6H 2 O was dissolved in 10ml of absolute ethanol to form a green solution 2, which was added to solution 1 and stirred for 1h.

[0027] c. Slowly drop the nitric acid solution with pH=2 into the above mixed solution under stirring until a gel is formed.

[0028] d. The gel is dried in an oven at 60° C. to obtain a dry gel, which is ground into powder.

[0029] e. Mix 0.8004 g of the above powder with 1.8006 g of urea, and calcinate at 500° C. for 2 hours to obtain a nitrogen-nickel co-doped titanium dioxide photocatalyst.

[0030] f. Take 0.1040 g of the above-mentioned photocatalyst, 104 ml of 10 mg / L methyl orange solution and add it to the reaction container, and react in the dark for 1 hour. The rate reached 54.5%.

Embodiment 3

[0032] a. Mix 15ml of tetra-n-butyl titanate and 10ml of absolute ethanol at room temperature, and stir for 20min to obtain a uniform and transparent yellow solution 1.

[0033] b. At room temperature, 0.7683g Ni(CH 3 COO) 2 .4H 2 O was dissolved in 5ml of absolute ethanol to form a green solution 2, which was added to 1 and stirred for 3h.

[0034] c. Slowly drop the acetic acid solution with pH=4 into the above mixed solution under stirring until a gel is formed.

[0035] d. The gel is dried in an oven at 90° C. to obtain a dry gel, which is ground into a powder.

[0036] e. Mix 0.8003 g of the above powder with 1.2006 g of urea, and calcinate at 400° C. for 5 hours to obtain a nitrogen-nickel co-doped titanium dioxide photocatalyst.

[0037] f. Take 0.1362g of the above-mentioned photocatalyst, 136ml of isatin solution of 10mg / L is added to the reaction container, react in dark for 1h, the light source is a 500W halogen lamp, after 70min of light, the decolorization rat...

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Abstract

The invention discloses a method for preparing a doped titanium dioxide photocatalyst. The method takes tetra-n-butyl titanate as a titanium source, nickel acetate or nickel nitrate as a nickel source, absolute ethyl alcohol as a solvent, and ethanoic acid or nitric acid as a inhibitor to obtain the doped titanium dioxide photocatalyst through drying and calcination. The photocatalyst has high photocatalytic activity in the presence of sunlight and can decompose organic pollutants in dye wastewater. The method has simple preparing process and low requirements on equipment conditions, and can realize industrial production.

Description

technical field [0001] The invention relates to the preparation of photocatalytic materials, in particular to a method for preparing a doped titanium dioxide photocatalyst, which can remove organic pollutants in water or air under sunlight. Background technique [0002] With the rapid development of industrial production, a large amount of waste is continuously discharged into nature, which makes the living environment of human beings worse. Waste water and waste gas contain a large amount of organic pollutants, which seriously threaten human health and life. Dye wastewater in various wastewater to be treated is difficult to be degraded by previous chemical and biological methods. At present, photocatalysis is widely used in the treatment of dye wastewater. As a photocatalyst, titanium dioxide has stable chemical properties and is cheap and easy to obtain. , non-toxic and other advantages, but titanium dioxide also has some defects, such as: wide energy band, can only absorb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J21/06A62D3/17A62D101/20
Inventor 李强张敏陈诚褚晶张娜孟婧夏金峰
Owner EAST CHINA NORMAL UNIV
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