Sulfur doped titanium dioxide photocatalyst with anatase structure water-heating preparation method

A technology of titanium dioxide and photocatalyst, which is applied in the field of hydrothermal preparation of sulfur-doped titanium dioxide photocatalyst, can solve the problems of affecting photoelectric properties and photocatalytic activity, poor dispersion, crystal damage, etc., to achieve product quality control, stable performance, low energy consumption effect

Inactive Publication Date: 2007-10-17
ZHEJIANG UNIV
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AI Technical Summary

Problems solved by technology

[0004] Current sulfur-doped nano-TiO 2 The methods used in the preparation of photocatalysts are: ultrasonic method, hydrothermal method, ion implantation method, and sol-gel method, but they have the following disadvantages: the particles prepared by the sol-gel method are large and have poor dispersion; The injection method will cause damage to the crystal, thereby affecting its photoelectric properties and photocatalytic activity, and the cost is high; the titanium source used in the hydrothermal method is titanium tetrachloride, and the prepared TiO 2 It is rutile type, because the photocatalytic activity of rutile type titanium dioxide is not as good as that of anatase type titanium dioxide, so the preparation of sulfur-doped titanium dioxide with anatase structure has good development prospects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Stir and mix 8mL butyl titanate, 55mL deionized water, 15mL absolute ethanol, 5mL triethanolamine, and 0.38g thiourea at a temperature of 10°C to obtain a nanopowder precursor solution;

[0020] Put the above-mentioned nano-powder precursor solution into the reactor, heat it up to 150°C at a rate of 1°C / min for hydrothermal reaction, stop heating after 2 hours of reaction, take it out after the reactor is naturally cooled to room temperature, and rinse with deionized water Wash with absolute ethanol for 3 times, put into a vacuum drying oven and dry at 50°C to obtain a sulfur-doped titanium dioxide photocatalyst with an anatase structure.

[0021] In this nano titanium dioxide anatase crystal powder, about 0.023 (volume ratio) of sulfur element is doped. We set 10ml of 20mg / L methyl orange solution as the object of organic matter catalysis, took 20mg of the powder prepared above as the catalyst, and used the HQI-BT 400W / D metal halide lamp of Osram, Germany as the light...

Embodiment 2

[0024] Stir and mix 12mL butyl titanate, 65mL deionized water, 25mL absolute ethanol, 10mL triethanolamine, and 4.56g thiourea at a temperature of 40°C to obtain a nanopowder precursor solution;

[0025] Put the above-mentioned nano-powder precursor solution into the reactor, heat it up to 240°C at a rate of 5°C / min for hydrothermal reaction, stop heating after 5 hours of reaction, take it out after the reactor is naturally cooled to room temperature, and rinse with deionized water and anhydrous ethanol for 4 times, put into a vacuum oven and dry at 80° C. to obtain a sulfur-doped titanium dioxide photocatalyst with an anatase structure. The photocatalytic performance was tested under the same experimental conditions as in Example 1.

[0026] Compared with the undoped nano titanium dioxide powder prepared by the same formula, the photocatalytic effect similar to that of Example 1 was obtained.

Embodiment 3

[0028] Stir and mix 10.5mL butyl titanate, 62mL deionized water, 21mL absolute ethanol, 9.1mL triethanolamine, and 3.09g thiourea at a temperature of 20°C to obtain a nanopowder precursor solution;

[0029] Put the above-mentioned nano-powder precursor solution into the reactor, heat it up to 200°C at a rate of 2°C / min for hydrothermal reaction, stop heating after 3 hours of reaction, take it out after the reactor is naturally cooled to room temperature, and rinse with deionized water Wash with absolute ethanol for 4 times, put into a vacuum drying oven and dry at 60° C. to obtain a sulfur-doped titanium dioxide photocatalyst with an anatase structure. The photocatalytic performance was tested under the same experimental conditions as in Example 1.

[0030] Compared with the undoped nano titanium dioxide powder prepared by the same formula, the photocatalytic effect similar to that of Example 1 was obtained.

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Abstract

The invention discloses a hydrothermal preparation method for a sulfur doping titanium dioxide photocatalyst with an anatase structure, comprising the following steps: 1)preparing a nano powder precursor solution by agitating and mixing 8-12ml butyl titanate, 55-65ml deionized water, 15-25ml absolute ethyl alcohol, 5-10ml trolamine and 0.38-4.56 gthiourea at a temperature of 10-40 DEG C; 2) preparing a nano powder in a hydrothermal condition by placing the nano powder precursor solution into a reaction kettle, rising temperature at a speed of 1-5 DEG C/min to 150-240 DEG C and keeping the temperature to perform the hydrothermal reaction, stopping heating after 2-5 hours, when the reaction kettle is naturally cooled to room temperature, taking out the reactants, washing with the deionized water and the absolute ethyl alcohol for 3-4 times, and finally drying the reactants in a vacuum drying oven at 50-80 DEG C. The invention is capable of synchronous achieving processes both of the preparation of TiO2 nano particle and sulfur doping, which makes the preparation technical line of the catalyst more reasonable, be suitable to product quantity control with low energy consumption.

Description

technical field [0001] The invention relates to a hydrothermal preparation method of sulfur-doped titanium dioxide photocatalyst with anatase structure. Background technique [0002] In recent decades, due to the increasingly serious environmental pollution and energy crisis, people have conducted extensive research to explore new and practical environmental protection treatment technologies. Semiconductor photocatalysis technology provides an opportunity to solve this problem. Among them, titanium dioxide is considered to be the most potential photocatalyst because of its high chemical stability, non-toxicity and low price. However, due to TiO 2 The bandgap width is large (Eg≈3.0-3.2ev), and its absorption spectrum is in the near-ultraviolet region (λ<400nm). In order to improve the utilization of sunlight, scholars have synthesized new narrow-bandgap semiconductors, semiconductor recombination, and dye photosensitive Chemicalization, metal ion doping, non-metal doping...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04
Inventor 王智宇赵彬樊先平钱国栋
Owner ZHEJIANG UNIV
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