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Method for preparing molecular imprinting-doped TiO2 with high catalytic degradation activity under visible light

A technology of molecular imprinting and catalytic degradation, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve problems such as invention patent blanks, improve utilization rate, improve the ability to degrade organic pollutants, The effect of improving the adsorption capacity

Inactive Publication Date: 2014-03-05
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In summary, domestic and foreign research on non-metallic elements doped TiO 2 There are many applications for degrading organic pollutants, and there are also a small amount of molecularly imprinted TiO 2 Reports applied to photocatalytic degradation, but will be doped with TiO 2 Reports and invention patents for photocatalytic degradation combined with molecular imprinting technology are still blank

Method used

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  • Method for preparing molecular imprinting-doped TiO2 with high catalytic degradation activity under visible light
  • Method for preparing molecular imprinting-doped TiO2 with high catalytic degradation activity under visible light
  • Method for preparing molecular imprinting-doped TiO2 with high catalytic degradation activity under visible light

Examples

Experimental program
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Effect test

Embodiment 1

[0021] (1) S-doped TiO 2 The synthesis of: under ice bath conditions, first TiCl 4 Add to ice water dropwise, and then add Na at a molar ratio of 1% to the titanium source 2 SO 4 , heated to reflux for 4 hours, aged for 2 hours, then the obtained white substance was centrifuged, washed with water, washed with ethanol, dried at 80°C, and finally roasted at 450°C for 3h to obtain S-doped TiO 2 .

[0022] (2) Molecularly imprinted-doped TiO 2 Synthesis: Add 0.023g p-phenylenediamine and 0.01g salicylic acid into 40mL deionized water, stir for 30min, adjust the pH of the solution to 1, then add 0.2g S doped TiO 2 , continue to stir for 30min, add 0.045g ammonium persulfate under ice bath conditions, stir for 4h under ice bath, centrifuge the solution after reaction, first use Na 2 CO 3 Wash with solution, wash with water, and finally dry at 50°C to obtain molecularly imprinted-doped TiO 2 catalyst.

[0023] (3) Molecularly imprinted-doped TiO 2 Degradation of organic poll...

Embodiment 2

[0025] (1) S-doped TiO 2 The synthesis of: under ice bath conditions, first TiCl 4 Add to ice water dropwise, and then add Na at a molar ratio of 1% to the titanium source 2 SO 4 , heated to reflux for 4 hours, aged for 2 hours, then the obtained white substance was centrifuged, washed with water, washed with ethanol, dried at 80°C, and finally roasted at 450°C for 3h to obtain S-doped TiO 2 .

[0026] (2) Molecularly imprinted-doped TiO 2 Synthesis: Add 0.046g p-phenylenediamine and 0.02g o-chlorophenol into 40mL deionized water, stir for 30min, adjust the pH of the solution to 2, then add 0.2g S doped TiO 2 , continue to stir for 30min, add 0.18g ammonium persulfate under ice bath condition, stir under ice bath for 2h, centrifuge the solution after reaction, first use Na 2 CO 3 Wash with solution, wash with water, and finally dry at 50°C to obtain molecularly imprinted-doped TiO 2 catalyst.

[0027] (3) Molecularly imprinted-doped TiO 2 Degradation of organic pollut...

Embodiment 3

[0029] (1) S-doped TiO 2 The synthesis of: under ice bath conditions, first TiCl 4 Add to ice water dropwise, and then add Na at a molar ratio of 1% to the titanium source 2 SO 4 , heated to reflux for 4 hours, aged for 2 hours, then the obtained white substance was centrifuged, washed with water, washed with ethanol, dried at 80°C, and finally roasted at 450°C for 3h to obtain S-doped TiO 2 .

[0030] (2) Molecularly imprinted-doped TiO 2 Synthesis: Add 0.0156g p-phenylenediamine and 0.0133g o-nitrophenol into 40mL deionized water, stir for 30min, adjust the pH of the solution to 0.5, then add 0.2g S-doped TiO 2 , continue to stir for 30min, add 0.45g ammonium persulfate under ice bath condition, stir under ice bath for 6h, centrifuge the solution after reaction, first use Na 2 CO 3 Wash with solution, wash with water, and finally dry at 50°C to obtain molecularly imprinted-doped TiO 2 catalyst.

[0031] (3) Molecularly imprinted-doped TiO 2 Degradation of organic po...

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Abstract

The invention relates to a method for preparing molecular imprinting-doped TiO2 with high catalytic degradation activity under visible light and belongs to the technical field of preparation of photocatalysts. The method comprises the following steps: synthesizing S-doped TiO2 by taking TiCl4 as a titanium source by a hydrothermal method; and performing chemical oxidative polymerization by taking phenylenediamine as a monomer and a crosslinking agent and organic pollutants as template molecules to synthesize the molecular imprinting-doped TiO2. Compared with the S-doped TiO2, the synthesized molecular imprinting-doped TiO2 has stronger adsorption capability on the organic pollutants and higher catalytic degradation activity on the organic pollutants under the visible light, improves the catalytic degradation capability by 30%, and has a high actual application value.

Description

technical field [0001] The present invention relates to a molecularly imprinted-doped TiO with high catalytic degradation activity under visible light 2 The preparation method belongs to the technical field of preparing photocatalysts. Background technique [0002] Nano-TiO 2 Photocatalyst has always been a research hotspot because of its high activity, low cost, wide application, mesoporous structure and stable physical and chemical properties. Due to anatase TiO 2 Up to 3.2eV energy level difference, making TiO 2 Nanoparticles can only use 3-5% of the energy in sunlight. Doping of non-metallic elements is a simple and effective way to modify TiO 2 method. It can not only make TiO 2 The active region shifts from the ultraviolet to the visible light region, which can also effectively prevent electrons and holes from agglomerating. [0003] with TiO 2 In comparison, TiO doped with non-metallic elements 2 The photocatalytic effect in the visible light region has been...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06C02F1/30C02F101/30
Inventor 刘湘王治强蒋伟群李文强
Owner JIANGNAN UNIV
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