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Method for fast sol-gel preparation of sulfur and nitrogen co-doped nano-titanium dioxide

A nano-titanium dioxide and co-doping technology, which is applied in the field of photocatalytic material preparation, can solve the problems of incomparable photocatalytic efficiency, easy formation of white flocs, and narrowing of forbidden width, etc., to achieve improved photocatalytic efficiency, simple process operation, The effect of reducing the electron-hole recombination rate

Active Publication Date: 2016-06-15
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 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

Method used

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  • Method for fast sol-gel preparation of sulfur and nitrogen co-doped nano-titanium dioxide
  • Method for fast sol-gel preparation of sulfur and nitrogen co-doped nano-titanium dioxide
  • Method for fast sol-gel preparation of sulfur and nitrogen co-doped nano-titanium dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0057] At room temperature, measure anhydrous ethanol and butyl titanate at a volume ratio of 10:1, respectively take thiourea and urea according to the amount of butyl titanate measured, thiourea, urea, and butyl titanate The molar ratio is 0.25:1:1; the measured 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 dilute nitric acid into mixture B, adjust the concentration of mixture B until the pH value of mixture B is 3.5; stir the mixture B with adjusted acidity for 20min to obtain sulfur and nitrogen co-doped nano-titanium dioxide sol-gel precursor;

[0058] Measure deionized water according to the amount of absolute ethanol measured, the volume ratio of deionized water to absolute ethanol is 0.05:1; slowly add sulfur and nitrogen co-doped with the measured deionized water using a constant pressure dropping funnel In the hetero-nanometer tita...

Embodiment 2

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

[0064] Measure deionized water according to the amount of absolute ethanol measured, the volume ratio of deionized water to absolute ethanol is 0.07:1; slowly add sulfur and nitrogen co-doped with the measured deionized water using a constant pressure dropping funnel In the hetero-nanometer titania sol-gel precur...

Embodiment 3

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

[0070] Measure deionized water according to the amount of absolute ethanol measured, the volume ratio of deionized water to absolute ethanol is 0.1:1; slowly add sulfur and nitrogen co-doped with the measured deionized water using a constant pressure dropping funnel In the hetero-nanometer titania sol-gel precursor, stir f...

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Abstract

The method for preparing sulfur-nitrogen co-doped nano-titanium dioxide by rapid sol-gel disclosed by the present invention is specifically implemented according to the following steps: Step 1, preparing sulfur-nitrogen co-doped nano-titanium dioxide sol-gel precursor; Step 2, taking deionized Adding water to the sulfur and nitrogen co-doped nano-titanium dioxide sol-gel precursor obtained in step 1, stirring and standing to obtain a wet gel; step 3, putting the wet gel obtained in step 2 into an oven, and Carry out drying treatment at 70°C to 90°C to obtain a xerogel with solvent and moisture removed; step 4, grind and calcinate the xerogel obtained in step 3 in turn to obtain anatase-type sulfur-nitrogen co-doping Nano titanium dioxide. The method for preparing sulfur and nitrogen co-doped nano-titanium dioxide by fast sol-gel of the present invention can prepare a sulfur-nitrogen co-doped nano-titanium dioxide photocatalyst with visible light activity, and not only will no white flocculent precipitate form during the gel process , also shortened the production cycle.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of photocatalytic materials, and relates to a rapid sol-gel method for preparing sulfur and nitrogen co-doped nano-titanium dioxide. Background technique: [0002] In the study of semiconductor nanophotocatalysts, TiO 2 It has the advantages of strong oxidation ability, non-toxicity, and good biochemical and photochemical stability, so it has always been at the core of photocatalytic research. However, due to TiO 2 (Anatase) has a large band gap, and can only show catalytic activity under the excitation of ultraviolet light, while the energy of ultraviolet light in sunlight accounts for only 4%, and the energy of visible light accounts for 43%. How to dope modified TiO 2 , to improve its photocatalytic activity and catalytic efficiency has become a hot research topic. [0003] Doping is to introduce a certain amount of impurities into the lattice of titanium dioxide, thereby affect...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24
Inventor 郭晓玲戴杰王向东
Owner XI'AN POLYTECHNIC UNIVERSITY
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