A kind of nitrogen, sulfur co-doped silica gel immobilized tio2 photocatalyst and preparation method thereof

A photocatalyst and co-doping technology, applied in the field of photocatalytic materials, can solve the problems of less energy to achieve effective doping, and achieve the effects of fine crystallization, firm immobilization, and strong adsorption capacity

Active Publication Date: 2019-02-15
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, even though a series of measures such as impregnation method, sol-gel method, and hydrothermal method have been adopted before the doping of organic matter with nitrogen and sulfur, once it is calcined at a high temperature above 600°C, it is rarely possible to achieve effective doping.

Method used

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  • A kind of nitrogen, sulfur co-doped silica gel immobilized tio2 photocatalyst and preparation method thereof
  • A kind of nitrogen, sulfur co-doped silica gel immobilized tio2 photocatalyst and preparation method thereof
  • A kind of nitrogen, sulfur co-doped silica gel immobilized tio2 photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Measure butyl titanate and ethyl orthosilicate respectively according to the molar ratio n(Ti):n(Si)=1:4, and then add a certain amount of ethanol under continuous stirring respectively to make a solution; then follow Molar ratio n(S): n(N)=1:2 Mixing ratio Measure concentrated sulfuric acid and concentrated nitric acid respectively, use deionized water to make a mixed acid solution with a mass concentration of 19% under continuous stirring;

[0034] 2) Put the tetraethyl orthosilicate solution in a magnetically stirred constant temperature water bath, add the butyl titanate solution dropwise under continuous stirring and a 60°C constant temperature water bath, continue stirring for 10 minutes, and then add the solution according to the molar doping ratio n (Ti): n (S, N) = 1: 0.08 Add the mixed acid solution drop by drop, and continue magnetic stirring for 20 minutes to obtain the copolymer sol;

[0035] 3) Continue to stand the copolymer sol in a constant temperatu...

Embodiment 2

[0039] 1) Measure butyl titanate and ethyl orthosilicate respectively according to the molar ratio n(Ti):n(Si)=1:3, and then add a certain amount of ethanol under continuous stirring to make a solution; then follow Molar ratio n(S):n(N)=1:1 Mixing ratio Measure concentrated sulfuric acid and concentrated nitric acid respectively, and use deionized water to make a mixed acid solution with a mass concentration of 20% under continuous stirring;

[0040] 2) Put the ethyl orthosilicate solution in a magnetically stirred constant temperature water bath, add the butyl titanate solution dropwise under continuous stirring and a 50°C constant temperature water bath, continue stirring for 5 minutes, and then add the solution according to the molar doping ratio n (Ti): n(S, N)=1:0.1 Measured mixed acid solution was added dropwise, and magnetic stirring was continued for 15 minutes to obtain copolymer sol;

[0041] 3) Continue to stand and age the copolymer sol at room temperature for 24 h...

Embodiment 3

[0045] 1) Measure butyl titanate and ethyl orthosilicate respectively according to the molar ratio n(Ti):n(Si)=1:2, and then add a certain amount of ethanol under continuous stirring respectively to make a solution; then follow Molar ratio n(S):n(N)=1:1.2 The mixing ratio is to measure concentrated sulfuric acid and concentrated nitric acid respectively, and use deionized water to make a mixed acid solution with a mass concentration of 18% under continuous stirring;

[0046] 2) Put the ethyl orthosilicate solution in a magnetically stirred constant temperature water bath, add the butyl titanate solution dropwise under continuous stirring and a 55°C constant temperature water bath, continue stirring for 8 minutes, and then add the solution according to the molar doping ratio n (Ti): n (S, N) = 1: 0.05 The measured mixed acid solution was added dropwise, and magnetic stirring was continued for 10 minutes to obtain the copolymer sol;

[0047] 3) Continue to stand the copolymer so...

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Abstract

The invention discloses a nitrogen and sulfur codoped silica gel supported TiO2 photocatalyst and a preparation method thereof. The method comprises the steps: preparing sol by taking tetraethoxysilane and butyl titanate as precursor raw materials for supporting TiO2 and taking mixed acid of sulfuric acid and nitric acid as a nitrogen and sulfur doped source and an initiator for sol-gel reaction; standing in constant-temperature water bath or standing at room temperature for ageing to prepare a silicon-titanium copolymer containing sulfate radical and nitrate radical; sintering under nitrogen atmosphere to prepare the nitrogen and sulfur codoped silica gel supported TiO2 photocatalyst. The photocatalyst prepared by the method has high purity and crystallinity; nitrogen and sulfur codoped TiO2 crystal particles are positioned in a silica gel mesoporous framework structure, so N and S are effectively codoped, the photoresponse range of the TiO2 photocatalyst is widened, and the aims of photocatalytic red shift and sunlight efficient utilization are fulfilled.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, in particular to a nitrogen and sulfur co-doped silica gel immobilized TiO 2 Photocatalyst and its preparation method. Background technique [0002] At present, there are three main methods for controlling environmental pollution: physical method, chemical method and biological method. As for the organic pollutants in the aqueous solution, the main treatment methods are photocatalytic degradation method, chemical method and biological method, and the ultimate goal is to decompose the organic pollutants in the aqueous solution into carbon dioxide and water and other environmentally harmless substances. Photocatalytic degradation is a method of using solar energy to control water pollution. Compared with traditional degradation technology, photocatalytic degradation technology has many advantages in environmental governance. The research on semiconductor photocatalytic materials r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/24
CPCB01J27/24B01J35/004
Inventor 张超武王夏云张利娜张楠王芬
Owner SHAANXI UNIV OF SCI & TECH
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