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

A nano-titanium dioxide and co-doping technology, which is applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., can solve incomparable photocatalytic efficiency, easy formation of white flocs, narrowing of forbidden width, etc. problem, to achieve the effect of improved photocatalytic efficiency, simple process operation, and reduced electron-hole recombination rate

Active Publication Date: 2014-09-10
XI'AN POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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 ultrav

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] At room temperature, measure the absolute ethanol and butyl titanate at a volume ratio of 10:1. According to the measured butyl titanate, take thiourea and urea, thiourea, urea, and butyl titanate. The molar ratio is 0.25:1:1; the amount of absolute ethanol and butyl titanate are mixed uniformly to prepare mixture A; thiourea and urea are added to mixture A to obtain mixture B; the mass percentage concentration is 5% Add the diluted nitric acid to the mixture B, adjust the concentration of the mixture B until the pH value of the mixture B is 3.5; stir the mixture B with adjusted acidity for 20 minutes to obtain the sulfur and nitrogen co-doped nano titanium dioxide sol-gel precursor;

[0058] Measure deionized water according to the amount of absolute ethanol, the volume ratio of deionized water to absolute ethanol is 0.05:1; use constant pressure dropping funnel to slowly add sulfur and nitrogen co-mixing In the mixed nanometer titanium dioxide sol-gel precursor, stir for...

Embodiment 2

[0063] At room temperature, measure the absolute ethanol and butyl titanate at a volume ratio of 12:1, and take the molar ratio of thiourea and urea according to the measured butyl titanate, thiourea, urea, and butyl titanate. Is 0.5:1:1; mix the amount of absolute ethanol and butyl titanate uniformly to prepare mixture A; add thiourea and urea to mixture A to obtain mixture B; take the dilute with a mass percentage concentration of 4% Nitric acid is added to the mixture B, and the concentration of the mixture B is adjusted until the pH value of the mixture B is 3; the acidity-adjusted mixture B is stirred for 10 minutes to obtain the sulfur-nitrogen co-doped nano titanium dioxide sol-gel precursor;

[0064] Measure deionized water according to the amount of absolute ethanol, the volume ratio of deionized water to absolute ethanol is 0.07:1; add the deionized water slowly with a constant pressure dropping funnel into sulfur and nitrogen co-mixing In the mixed nano-titanium dioxid...

Embodiment 3

[0069] At room temperature, measure the absolute ethanol and butyl titanate at a volume ratio of 15:1. According to the measured butyl titanate, take the molar ratio of thiourea and urea, thiourea, urea, and butyl titanate. Is 0.75:1:1; mix the amount of absolute ethanol and butyl titanate uniformly to prepare mixture A; add thiourea and urea to mixture A to obtain mixture B; take the dilute with a mass percentage concentration of 4% Nitric acid was added to the mixture B, and the concentration of the mixture B was adjusted until the pH value of the mixture B was 4; the acidity-adjusted mixture B was stirred for 13 minutes to obtain the sulfur-nitrogen co-doped nano titanium dioxide sol-gel precursor;

[0070] Measure deionized water according to the amount of absolute ethanol, the volume ratio of deionized water to absolute ethanol is 0.1:1; use constant pressure dropping funnel to slowly add sulfur and nitrogen co-mixing In the mixed nanometer titanium dioxide sol-gel precursor...

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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...

Claims

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Application Information

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IPC IPC(8): B01J27/24
Inventor 郭晓玲戴杰王向东
Owner XI'AN POLYTECHNIC UNIVERSITY
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