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Method for preparing carbon and nitrogen-doped titanium dioxide photocatalyst

A technology of titanium dioxide and catalyst, which is applied in the field of preparation of titanium dioxide photocatalyst, which can solve the problems of increasing grain size, difficulty in ensuring the stability and uniformity of photocatalyst structure, etc.

Inactive Publication Date: 2006-05-24
EAST CHINA UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

At present, TiO doped with non-metallic elements is synthesized 2 The main method is to directly heat synthesis at high temperature (above 500°C) in a nitrogen-containing atmosphere. This high-temperature preparation method has certain defects, that is, on the one hand, it will lead to TiO 2 The grain size increases, on the other hand nitrogen is difficult to dope into TiO 2 lattice
In addition, due to the high temperature post-treatment in the prior art, it is difficult to guarantee the structural stability and uniformity of the prepared photocatalyst

Method used

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  • Method for preparing carbon and nitrogen-doped titanium dioxide photocatalyst

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preparation example Construction

[0014] The preparation method of the titanium dioxide visible light catalyst doped with carbon and nitrogen of the present invention comprises the following steps:

[0015] (1) Surfactant Triton X-100 (Triton X-100), co-surfactant n-hexanol and continuous oil phase cyclohexane are mixed, stirred to a transparent solution as the oil phase; n-butyl titanate and Nitric acid or hydrochloric acid is mixed to form a water phase, and the water phase is added dropwise into the oil phase under stirring conditions to form a transparent microemulsion;

[0016] (2) nitrogen source (such as: triethylamine, urea, thiourea or N 2 h 4 ·H 2 O) add in the microemulsion obtained by step (1), make the molar ratio of N and Ti be 0.5~4, get transparent solution after stirring;

[0017] (3) Place the solution obtained from step (2) in a reactor, and conduct a hydrothermal reaction at 120°C for 13 hours; wash the solid product of the hydrothermal reaction with absolute ethanol and distilled water,...

Embodiment 1

[0025] Mix 10ml Triton X-100, 6ml n-hexanol and 16ml cyclohexane, stir until the solution is transparent, add the mixed solution of 3.4ml n-butyl titanate and 8ml 5M nitric acid dropwise into the above solution to form a transparent microemulsion, continue Stir for 6h. The resulting mixed solution was transferred to a 100 mL stainless steel autoclave lined with polytetrafluoroethylene, and hydrothermally heated at 120 °C for 13 h. After hydroheating, the upper layer in the kettle is a transparent yellow liquid, and the lower layer is a milky white solid. The upper layer liquid in the kettle is poured out, and the solid product obtained is washed three times with absolute ethanol and distilled water, and dried at 100 ° C after centrifugation. A milky white powder was obtained.

Embodiment 2

[0027] Except that the 5M nitric acid of 8ml among the 10M hydrochloric acid of 4ml is replaced in embodiment 1, other conditions are the same as embodiment 1 to white powder.

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Abstract

The present invention relates to a preparation method of titanium dioxide visible photocatalyst in which the carbon and nitrogen are doped. Said method includes the following steps: firstly, adding nitrogen source into the microemulsion formed from n-butyl titanate, inorganic acid, Triton X-100, n-hexyl alcohol and cyclohexane and making mole ratio value of nitrogen and titanium be 0.5-4, then placing the nitrogen-contained microemulsion in a reactor, making hydrothermal reaction for 13 hr at 120deg.C, finally washing the product obtained after hydrothermal reaction, separating and drying so as to obtain the invented target product.

Description

technical field [0001] The invention relates to a method for preparing a titanium dioxide photocatalyst, in particular to a method for preparing a carbon and nitrogen-doped titanium dioxide visible light catalyst. Background technique [0002] Titanium dioxide (TiO 2 ) as a wide-bandgap semiconductor has been widely used in the degradation of atmospheric and water environmental pollutants, antibacterial, deodorizing, and self-cleaning due to its stable properties, non-toxicity, and high-efficiency photocatalytic activity. However, due to the wide band gap of titanium dioxide, the response to visible light is weak, which seriously affects and restricts its practical application in photocatalysis and other aspects. [0003] Ion doping is to improve the TiO 2 An efficient approach to photocatalytic activity in the visible region. Although transition metal ion doping can improve TiO 2 activity under visible light, but because metal ions become recombination centers, making T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/00B01J21/06
Inventor 张金龙丛野陈锋童天中
Owner EAST CHINA UNIV OF SCI & TECH
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