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

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...

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