Supported photocatalyst with high activity under visible light and preparation method thereof

A photocatalytic material, visible light technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low catalytic activity, difficult loading, etc., achieve simple preparation process, widen light response range, the effect of good photocatalytic activity

Inactive Publication Date: 2011-10-05
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Preparation of conjugated polymer / TiO by heat treatment of PVC to remove HCl 2 Composite photocatalytic materials (Min Shixiong, Wang Fang, TiO 2 / Photocatalytic properties of conjugated polymer nanocomposites under natural light, Applied Chemistry, 2009, 26, 409~412), the corrosive and polluting HCl will be released during the preparation process, which limits the Its application; with polyvinyl alcohol (PVA) and Ti(OH) 4 As a raw material, TiO with visible light catalytic activity can be obtained by hydrothermal preparation process 2 / D-PVA composite particles (Yongzhong Wang, Mingqiang Zhong, Visible light photocatalytic activity of TiO 2 / D-PVA for MO degradation, Applied Catalysis B: Environmental, 2009, 90, 249~254), but the catalytic activity is not high, and the loading is difficult

Method used

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  • Supported photocatalyst with high activity under visible light and preparation method thereof
  • Supported photocatalyst with high activity under visible light and preparation method thereof
  • Supported photocatalyst with high activity under visible light and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, add 0.1 parts of concentrated hydrochloric acid and 100 parts of distilled water into a reaction kettle equipped with a thermometer, a stirrer and a reflux condenser, raise the temperature to 70°C, add 5 parts of n-butyl titanate, 15 parts of absolute ethanol and 10 parts of The mixed solution of glacial acetic acid was reacted for 0.5h to obtain a translucent sol, which was further aged at room temperature for a certain period of time to obtain a bluish transparent TiO 2 Sol; take 20 parts of TiO 2 sol, add 0.5 part of acetylacetone, after stirring evenly, add 0.1 part of 15% PVA (polymerization degree 500, alcoholysis degree 99%) solution, continue stirring for 1 hour to get PVA / TiO 2 Sol; the PVA / TiO 2 The sol is coated on the inorganic carrier, dried at 70°C, and finally the carrier loaded with the catalyst is placed in a muffle furnace protected by an inert gas, heated to 300°C, and calcined for 1 hour to obtain the composite photocatalytic material.

Embodiment 2

[0024] First, add 0.5 parts of concentrated nitric acid and 150 parts of distilled water into a reaction kettle equipped with a thermometer, agitator and reflux condenser, raise the temperature to 50°C, add 10 parts of n-butyl titanate, 20 parts of absolute ethanol and 1 part of A mixed solution of glacial acetic acid was reacted for 2 hours to obtain a translucent sol, which was further aged at room temperature for a certain period of time to obtain a bluish transparent TiO 2 Sol; take 20 parts of TiO 2 Sol, add 1.0 parts of acetylacetone, after stirring evenly, add 5 parts of 5% PVA (polymerization degree 1700, alcoholysis degree 88%) solution, continue to stir for 2 hours to get PVA / TiO 2 Sol; the PVA / TiO 2 The sol is coated on the inorganic carrier, dried at 80°C, and finally the carrier loaded with the catalyst is placed in a muffle furnace protected by an inert gas, heated to 120°C, and calcined for 3 hours to obtain the composite photocatalytic material.

Embodiment 3

[0026] First, add 1 part of concentrated hydrochloric acid and 50 parts of distilled water into a reaction kettle with a thermometer, a stirrer and a reflux condenser, raise the temperature to 60°C, add 15 parts of n-butyl titanate, 5 parts of absolute ethanol and 5 parts of A mixed solution of glacial acetic acid was reacted for 5 hours to obtain a translucent sol, which was further aged at room temperature for a certain period of time to obtain a bluish transparent TiO 2 Sol; take 20 parts of TiO 2 Sol, add 0.05 parts of acetylacetone, after stirring evenly, add 20 parts of 1% PVA (polymerization degree 2400, alcoholysis degree 78%) solution, continue stirring for 1 hour to get PVA / TiO 2 Sol; the PVA / TiO 2 The sol is coated on the inorganic carrier, dried at 60°C, and finally the carrier loaded with the catalyst is placed in a muffle furnace protected by an inert gas, heated to 200°C, and calcined for 6 hours to obtain the composite photocatalytic material.

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Abstract

The invention discloses a supported photocatalyst with high activity under visible light and a preparation method thereof. The preparation method is characterized by comprising the steps of: preparing a polyvinyl alcohol-titanium dioxide composite film by using a sol-gel method, and subjecting the polyvinyl alcohol-titanium dioxide composite film to a certain thermal treatment. A polymer is combined with an inorganic matter by using chemical bonds to form a mutually-crosslinked net structure which has better film-forming performance and can be loaded on inorganic carriers such as glass, ceramic, silicon gel, metal and the like. The method has the advantages of wide sources of raw materials, lower cost and simple and controllable preparation process; and the prepared photocatalytic material under the visible light and can be used for effectively degrading organic pollutants.

Description

technical field [0001] The technology relates to a loadable photocatalytic material with high catalytic activity under visible light irradiation and a preparation method thereof, belonging to the field of environmental protection materials. Background technique [0002] The discovery of the Honda-Fujishima effect in 1972 created a new field of nano-semiconductor photocatalysis research. TiO was discovered by Pruden and Ollis in 1983 2 After the photomineralization phenomenon of halogenated organic compounds (such as trichlorethylene, dichloromethane, etc.) in the sensitization system, people clearly realized the mineralization function of semiconductor photocatalysts for organic pollutants. Since then, photocatalytic technology has shown broad application prospects in air pollution control and water purification. However, due to TiO 2 The band gap is wide (anatase phase, Eg=3.2eV), and it can only be excited by short-wavelength ultraviolet light (≤387.5nm), while ultravio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J37/02C02F1/30
Inventor 淡宜宋远卿杨海刚徐守斌张见玲江龙
Owner SICHUAN UNIV
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