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Preparation method of Cr and S co-doped TiO2 nanopowder

A nano-powder and co-doping technology, applied in catalyst activation/preparation, nanotechnology, nanotechnology, etc., can solve the problem of hindering the recombination time of electrons and holes, hindering the recombination of photogenerated carriers, and low light absorption rate, etc. problem, to achieve the effect of strong ability to absorb ultraviolet light, wide light absorption range, and enhanced light absorption rate

Inactive Publication Date: 2019-07-23
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims to solve the problem of existing TiO 2 The photocatalyst can solve the problem of extremely low light absorption rate (3%~5%), and provide a method to improve the photocatalytic efficiency, and the TiO can be changed by Cr doping 2 The crystallinity may cause lattice defects, so it can hinder the recombination of photogenerated carriers, and a small amount of Cr 3+ Doping can form traps, hinder the recombination of electrons and holes or prolong their recombination time, thereby improving the TiO 2 photocatalytic activity, in addition, Cr 3+ The light absorption range is wider than that of TiO 2 wide, doped TiO 2 The absorbed light can be greatly red-shifted, moving from the ultraviolet region to the visible region, improving the light absorption efficiency under visible light

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  • Preparation method of Cr and S co-doped TiO2 nanopowder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A kind of Cr, S co-doped TiO 2 The preparation method of nanometer powder, concrete steps are as follows:

[0023] (1) Mix tetrabutyl titanate and absolute ethanol at a ratio of 1:2 by volume, stir continuously in a constant temperature water bath at 30°C until a transparent solution is obtained, and use it as liquid A at a stirring speed of 300 rpm;

[0024] (2) Na 2 S 2 o 3 ·5H 2 O was mixed with absolute ethanol, glacial acetic acid, and distilled water in a mass ratio of 2.48:25:20:10, stirred continuously in a constant temperature water bath at 30°C until a transparent solution was obtained, and used as liquid B at a stirring speed of 300 rpm;

[0025] (3) Add CrCl 3 ·6H 2 O was mixed with absolute ethanol, glacial acetic acid, and distilled water in a mass ratio of 2.66:25:20:10, stirred continuously in a constant temperature water bath at 30°C until a transparent solution was obtained, and used as liquid C at a stirring speed of 300 rpm;

[0026] (4) Accor...

Embodiment 2

[0031] A kind of Cr, S co-doped TiO 2 The preparation method of nanometer powder, concrete steps are as follows:

[0032] (1) Mix tetrabutyl titanate and absolute ethanol at a volume ratio of 1:3, stir continuously in a constant temperature water bath at 35°C until a transparent solution is obtained, and use it as liquid A at a stirring speed of 400 rpm;

[0033] (2) Na 2 S 2 o 3 ·5H 2 O was mixed with absolute ethanol, glacial acetic acid, and distilled water in a mass ratio of 2.48:35:20:10, and was continuously stirred in a constant temperature water bath at 35°C until a transparent solution was obtained as liquid B, and the stirring speed was 400 rpm;

[0034] (3) Add CrCl 3 ·6H 2 O was mixed with absolute ethanol, glacial acetic acid, and distilled water in a ratio of 2.66:35:20:10 by mass, stirred continuously in a constant temperature water bath at 35°C until a transparent solution was obtained, and used as liquid C at a stirring speed of 400 rpm;

[0035] (4) Ac...

Embodiment 3

[0039] A kind of Cr, S co-doped TiO 2 The preparation method of nanometer powder, concrete steps are as follows:

[0040] (1) Mix tetrabutyl titanate and absolute ethanol at a volume ratio of 1:2.5, stir continuously in a constant temperature water bath at 40°C until a transparent solution is obtained, and use it as liquid A at a stirring speed of 500 rpm;

[0041] (2) Na 2 S 2 o 3 ·5H 2 O was mixed with absolute ethanol, glacial acetic acid, and distilled water in a ratio of 2.48:30:20:10 by mass, stirred continuously in a constant temperature water bath at 40°C until a transparent solution was obtained, and used as liquid B at a stirring speed of 500 rpm;

[0042] (3) Add CrCl 3 ·6H 2 O was mixed with absolute ethanol, glacial acetic acid, and distilled water in a mass ratio of 2.66:30:20:10, stirred continuously in a constant temperature water bath at 40°C until a transparent solution was obtained, and used as liquid C at a stirring speed of 500 rpm;

[0043] (4) Acc...

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Abstract

The invention discloses a preparation method of Cr and S co-doped TiO2 nanopowder and belongs to the technical field of functional materials. Nano TiO2 powder is prepared with a sol-gel method, meanwhile, Cr and S are doped to modify the TiO2 powder, and the recombination rate of photo-induced electron-hole pairs is decreased while band gap width of TiO2 is reduced, so that the prepared TiO2 powder has substantially improved light absorption efficiency in a visible region and keeps high light absorption efficiency in an ultraviolet region. The method is simple in process and high in synthesisrate, and the prepared Cr and S co-doped TiO2 nanopowder has good photocatalytic activity and has important application values in the aspects of environmental protection such as pollutant degradation.

Description

technical field [0001] The invention relates to a preparation method of Cr and S co-doped TiO2 nanometer powder, which belongs to the technical field of functional materials. Background technique [0002] Semiconductor photocatalysts have been widely used due to their excellent characteristics in the treatment of water pollution, among which TiO 2 Nanophotocatalyst is the most researched and most promising semiconductor photocatalyst. TiO 2 There are three phases in nature: rutile phase, anatase phase and brookite phase, brookite and anatase phase are metastable states, they are TiO 2 The low-temperature phase in 2 The high-temperature phase, the transformation temperature of anatase phase and brookite phase to rutile phase is generally 500~600 °C. Anatase TiO 2 TiO with a larger rutile phase 2 It has better photocatalytic performance, especially when the particle size drops to the nanometer level, its photocatalytic characteristics are more significant, and it is a ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/047B01J37/03B82Y30/00B82Y40/00C02F1/32C02F101/36C02F101/38
CPCB01J27/047B01J37/036B82Y30/00B82Y40/00C02F1/32C02F2101/36C02F2101/38C02F2305/10C02F2101/308B01J35/39
Inventor 甘国友黄佳敏刘明余向磊严继康杜景红张家敏易健宏
Owner KUNMING UNIV OF SCI & TECH
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