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Mesoporous composite titanium-tin photocatalyst and preparation method thereof

A photocatalyst and composite technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of easy loss of active components and low content of active components , low catalyst life and other problems, to achieve the effect of improving photocatalytic oxidation performance, good adsorption performance, and high catalytic activity

Inactive Publication Date: 2018-06-19
嘉兴市众盛环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above methods all load the active component on the carrier, the content of the active component in the material is small, and the catalytic activity is low; and the active component is loaded on the surface of the carrier, the active component is easy to lose during long-term use, resulting in catalyst deactivation , lower catalyst life

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1) Add 3ml of 12mol / L concentrated hydrochloric acid dropwise to 840ml of absolute ethanol, stir evenly, add tin chloride, and dissolve to obtain a 0.1mol / L tin chloride solution; add 3ml dropwise to the tin chloride solution for analysis Pure acetic acid, stir evenly, add butyl titanate, Sn:Ti ratio of 1:35, slowly add 10ml of ultrapure water dropwise under rapid stirring at 50°C to obtain a transparent and stable gel solution, referred to as liquid A;

[0028] 2) Using CTAB as the structure-directing agent, using ultrapure water at 50°C as the solvent, Tn:CTAB molar ratio is 1:50, prepare a CTAB solution with the same volume as the titanium sol solution, which is the template sol solution, referred to as B solution ;

[0029] 3) Slowly add liquid B to liquid A at a stirring speed of 200rad / min, and react at 60°C for 15 hours to obtain a mixed liquid of mesoporous titanium-tin molecular sieve precursor, which is centrifuged and washed to obtain the precursor, which is ...

Embodiment 2

[0032] 1) Add 5ml of 12mol / L concentrated hydrochloric acid dropwise to 840ml of absolute ethanol, stir evenly, add tin chloride, and dissolve to obtain a 0.2mol / L tin chloride solution; add 2ml dropwise to the tin chloride solution for analysis Pure acetic acid, stir evenly, add butyl titanate, Sn:Ti ratio of 1:25, slowly add 9ml of ultrapure water dropwise under rapid stirring at 60°C to obtain a transparent and stable gel solution, referred to as liquid A;

[0033] 2) Using CTAB as the structure-directing agent, using ultrapure water at 40°C as the solvent, Tn: CTAB molar ratio is 1:30, prepare a CTAB solution with the same volume as the titanium sol solution, which is the template sol solution, referred to as B solution ;

[0034] 3) Slowly add liquid B to liquid A at a stirring speed of 250rad / min, and react at 50°C for 12 hours to obtain a mixed liquid of mesoporous titanium-tin molecular sieve precursor, which is centrifuged and washed to obtain the precursor, which is ...

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Abstract

The invention discloses a mesoporous composite titanium-tin photocatalyst, which is a mesoporous titanium-tin composite material formed by eutectic growth of two metal oxides of SnO2 and TiO2. The self-made mesoporous composite titanium-tin photocatalyst is used, and a template agent is used as a structure guider, so that metal crystals grow in a certain skeleton structure, and the material has acertain spatial structure, and good adsorption performance. Main components of the composite material all are active components with catalytic properties, so that the composite material has high catalytic activity; at the same time, the photocatalytic material utilizes the characteristic that a difference of conduction band energy levels of the SnO2 and the TiO2 is 0.5V, under the action of ultraviolet light, electrons on the surface of the TiO2 moves to the SnO2, the probability of recombination of the electrons and holes on the surface of the TiO2 is reduced, the holes have very strong oxidizing properties, and can form strong oxidizing .OH with water, and the photocatalytic oxidation performance of the material can be improved.

Description

technical field [0001] The invention belongs to the technical field of photocatalysts, and in particular relates to a mesoporous composite titanium-tin photocatalyst for wastewater treatment and a preparation method thereof. Background technique [0002] Photocatalytic technology can effectively degrade some refractory organic substances, and its technical feature is that it can deeply degrade refractory organic substances under mild conditions. As a commonly used photocatalyst, titanium dioxide has the characteristics of good safety, acid and alkali resistance, and low cost. It is mainly used to form electron-holes on the surface of titanium dioxide under the excitation of ultraviolet light, and the holes have strong oxidation properties. It can react with water to form OH, and non-selectively oxidize organic matter in water. [0003] In today's titanium dioxide photocatalytic application field, most studies use the preparation of nanoscale materials and loading them on hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/14B01J35/10C02F1/32C02F1/72C02F101/38C02F101/36
CPCC02F1/32C02F1/725B01J23/002B01J23/14C02F2305/10C02F2305/023C02F2101/36C02F2101/38C02F2101/40B01J35/39B01J35/60B01J35/61
Inventor 沈炜
Owner 嘉兴市众盛环保科技有限公司
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