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WXTiO2+3X/SiO2 aerogel compound photocatalyst and preparation method thereof

An aerogel and catalyst technology, applied in the field of WxTiO2+3x/SiO2 aerogel composite photocatalyst and its preparation, can solve the problems of poor photocatalytic activity, no adsorption capacity, no mesoporous structure, etc. The effect of adsorption efficiency and photocatalytic activity, channel convenience, and high-efficiency adsorption performance

Active Publication Date: 2015-06-10
DALIAN DALICAP TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Our previous patent CN 102671586B and patent CN 100574863C disclosed a TiO 2 -SiO 2 Composite airgel and preparation method thereof, mentioned TiO 2 -SiO 2 Composite aerogels have high pore volume and specific surface area, and can simultaneously have high adsorption capacity and photocatalytic capacity, but TiO 2 -SiO 2 The photocatalytic activity of composite aerogels is only limited to ultraviolet light irradiation, and the visible light catalytic activity is not good.
Literature (Image Science and Photochemistry, 2008,26(5):349-356) reported that doping WO 3 SiO 2 / TiO 2 The sol-hydrothermal synthesis and photocatalytic performance of the sol-hydrothermal synthesis, but the doped WO 3 SiO 2 / TiO 2 The material does not have a mesoporous structure and has no efficient adsorption capacity

Method used

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  • WXTiO2+3X/SiO2 aerogel compound photocatalyst and preparation method thereof
  • WXTiO2+3X/SiO2 aerogel compound photocatalyst and preparation method thereof
  • WXTiO2+3X/SiO2 aerogel compound photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Add 0.9g SiO per 50ml precursor solution 2 Airgel preparation of mesoporous W x TiO 2+3x / SiO 2 Airgel Photocatalyst

[0052] ① First add 25ml of ethanol aqueous solution to two 100ml autoclaves, the volume ratio of ethanol / water is 1:1, then add 0.9g of SiO 2 Airgel, stirred for 30min to get SiO 2 Aqueous ethanol dispersion of airgel.

[0053] ② Preparation of Ti(SO 4 ) 2 with H 2 WO 4 mixture

[0054] Put 12g Ti(SO 4 ) 2 Join in the 50ml ethanol aqueous solution, ethanol / water volume ratio is 1:1, obtains the Ti(SO 4 ) 2 solution.

[0055] Prepare 10ml of Na with a concentration of 0.5mol / L 2 WO 4 solution, using styrene cation exchange resin for ion exchange to obtain H with a concentration of 0.5mol / L 2 WO 4 solution.

[0056] Take 2ml H 2 WO 4 Added to 50ml Ti(SO 4 ) 2 solution, stirred for 30min to make it evenly mixed to obtain Ti(SO 4 ) 2 / H 2 WO 4 mixture

[0057] ③ Preparation of alcohol hydrothermal synthesis precursor

[0058] In...

Embodiment 2

[0065] Add 1.3g SiO per 50ml precursor solution 2 Airgel preparation of mesoporous W x TiO 2+3x / SiO 2 Airgel Photocatalyst

[0066] ① First add 25ml ethanol aqueous solution to two 100ml autoclaves respectively, the volume ratio of ethanol / water is 1:1, then add 1.3g pure SiO2 to each autoclave 2 Airgel, stirred for 30min to get SiO 2 Alcoholic solutions of airgel.

[0067] Its 2., 3., 4., 5. steps are with embodiment 1.

[0068] It was determined that the mesoporous W prepared by this method x TiO 2+3x / SiO 2 The airgel composite photocatalyst has a specific surface area of ​​271.3m 2 / g, the pore volume is 0.87ml / g, and the average pore diameter is 12.8nm. The adsorption rate of rhodamine B is 89.3% after adsorption in a dark room for 30 minutes, and the degradation rate of rhodamine B is 95.0% after continuing to light for 210 minutes.

Embodiment 3

[0070] Add 1.5g SiO per 50ml precursor solution 2 Airgel preparation of mesoporous W x TiO 2+3x / SiO 2 Airgel Photocatalyst

[0071] ① First add 25ml ethanol aqueous solution to two 100ml autoclaves respectively, the volume ratio of ethanol / water is 1:1, then add 1.5g pure SiO2 to each autoclave 2 Airgel, stirred for 30min to get SiO 2 Alcoholic solutions of airgel.

[0072] Its 2., 3., 4., 5. steps are with embodiment 1.

[0073] It was determined that the mesoporous W prepared by this method x TiO 2+3x / SiO 2 The airgel composite photocatalyst has a specific surface area of ​​262.3m 2 / g, the pore volume is 1.11ml / g, and the average pore diameter is 17.0nm. The adsorption rate of Rhodamine B was 83.7% in the dark room for 30 minutes, and the degradation rate of Rhodamine B was 95.1% after continued light for 210 minutes.

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Abstract

The invention relates to a WXTiO2+3X / SiO2 aerogel compound photocatalyst and a preparation method thereof, and belongs to the technical field of adsorption / photocatalystic materials for environment purification. SiO2 aerogel acts as a carrier of the WXTiO2+3X / SiO2 aerogel compound photocatalyst; a duct and the surface of the SiO2 aerogel are loaded with anatase type WxTiO2+3x particles; the WXTiO2+3X / SiO2 aerogel compound photocatalyst has the specific surface area of 190-350m<2> / g, and has the pore volume of 0.6-1.50ml / g, wherein the mole ratio of SiO2 aerogel to WxTiO2+3x is (0.06:1) to (1.5:1), and x=0.005-0.15. The mesoporous WXTiO2+3X / SiO2 aerogel compound prepared by the invention not only has an efficient adsorption performance, but also has an excellent visible light catalysis performance; harmful pollutants in air and water can be effectively removed effectively via the synergism of adsorption and photocatalysis; the WXTiO2+3X / SiO2 aerogel compound photocatalyst and the preparation method thereof have wide application prospect in the fields of environment purification of air purification, water purification and the like.

Description

technical field [0001] The present invention relates to a W x TiO 2+3x / SiO 2 An airgel composite photocatalyst and a preparation method thereof belong to the technical field of adsorption / photocatalytic materials for environmental purification. Background technique [0002] TiO 2 Due to its stable chemical properties, low production cost, non-toxicity and high photocatalytic activity, it is widely used in air purification, sewage treatment, photoelectric conversion and other fields. However, TiO 2 It is a wide-bandgap semiconductor material, which can only absorb and utilize the ultraviolet part of sunlight, but has a low absorption and utilization rate for visible light; and, TiO 2 The photogenerated electron-hole pairs are easy to recombine quickly, so their quantum efficiency is also very low. In order to overcome the above two disadvantages, TiO 2 Introduce metal or non-metal ions to make it generate doping energy levels in the forbidden band, on the one hand, im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J20/10B01J20/30
Inventor 史非刘敬肖王晓卡胡世成
Owner DALIAN DALICAP TECH CO LTD
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