Method for preparing sulfur-nitrogen co-doped nanometer titanium dioxide through rapid sol-gel process

Abstract

The invention discloses a method for preparing sulfur-nitrogen co-doped nanometer titanium dioxide through a rapid sol-gel process. The method specifically comprises the following steps: step 1. preparing a sulfur-nitrogen co-doped nanometer titanium dioxide sol-gel precursor; step 2. adding deionized water into the sulfur-nitrogen co-doped nanometer titanium dioxide sol-gel precursor obtained in the step 1, stirring and standing to obtain wet gel; step 3. putting the wet gel obtained in the step 2 into a drying oven, drying at the temperature of 70-90 DEG C to obtain dried gel in which the solvent and moisture are removed; and step 4. sequentially grinding and calcining the dried gel obtained in the step 3 to obtain anatase type sulfur-nitrogen co-doped nanometer titanium dioxide. According to the method for preparing the sulfur-nitrogen co-doped nanometer titanium dioxide through the rapid sol-gel process, a sulfur-nitrogen co-doped nanometer titanium dioxide photocatalyst with visible-light activity can be prepared, a white flocculent is avoided in the gelling process, and the production cycle is shortened.

Description

Technical field [0001] The invention belongs to the technical field of photocatalytic material preparation methods, and relates to a method for quickly preparing sulphur and nitrogen co-doped nano titanium dioxide by sol-gel. Background technique: [0002] In the research of semiconductor nanophotocatalyst, TiO 2 It has the advantages of strong oxidation ability, non-toxicity, good biochemical and photochemical stability, so it has always been at the core of photocatalysis research. However, due to TiO 2 (Anatase) has a large forbidden band width, and can display catalytic activity only under the excitation of ultraviolet light, while ultraviolet light energy in sunlight only accounts for 4%, and visible light energy accounts for 43%. How to dope modified TiO 2 , Its photocatalytic activity and catalytic efficiency can be improved has become a hot research topic. [0003] Doping is to introduce a certain amount of impurities into the crystal lattice of titanium dioxide, thereby af...

AI Technical Summary

Problems solved by technology

The doping of sulfur and nitrogen is in TiO 2 Introduce lattice oxygen vacancies, or part of the oxygen vacancies are replaced by sulfur and nitrogen, so that TiO 2 The forbidden width is narrowed, thereby expanding the response range of sunlight, and has strong absorption of ultraviolet light and visible light, and shows that ordinary nano-TiO2 can degrade pollutants. 2 Unmatched photocatalytic efficiency

[0004] Preparation of TiO by Sol-Gel Method 2 Photocatalyst is a common method, but it has the disadvantages of long period and easy generation of white flocs

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