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Load type visible light photocatalyst and preparation method thereof

A photocatalyst and visible light technology, which is applied in the field of water pollution treatment, can solve the problems of difficult catalyst recovery and easy loss, and achieve the effect of large promotion and application value, high loading capacity and stable structure

Inactive Publication Date: 2017-03-22
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of existing photocatalysts in practical applications, the purpose of the present invention is to provide a supported visible light photocatalyst and a preparation method thereof to solve the problems of difficulty in catalyst recovery and easy loss, thereby improving the efficiency of the supported photocatalyst. Catalytic activity and organic degradation rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] At room temperature, weigh PVP and PVA according to the mass ratio of 1:2, add deionized water to dissolve, heat and stir in a water bath at 90°C until completely dissolved, and maintain this temperature, according to PVP-PVA:Ag / AgBr / TiO 2 Add Ag / AgBr / TiO at a mass ratio of 1:2 2 (flaky) photocatalyst powder, so that it is uniformly dispersed in the mixed solution of PVA and PVP. After cooling to room temperature, add 0.5mL 2% borax and 0.5mL 2mol / L H 2 SO 4 Carry out immobilization, make it form gel, can cut it into the small box-shaped monolithic visible light photocatalyst of certain size according to need, the degradation rate of the RhB solution of the prepared supported visible light photocatalyst is 45.3%.

Embodiment 2

[0022] At room temperature, weigh PVP and PVA according to the mass ratio of 1:2, add deionized water to dissolve, heat and stir in a water bath at 90°C until completely dissolved, and maintain this temperature, according to PVP-PVA:Ag / AgBr / TiO 2 Add Ag / AgBr / TiO at a mass ratio of 1:1 2 (Mesoporous) photocatalyst powder, so that it is uniformly dispersed in the mixed solution of PVA and PVP. After cooling to room temperature, add 0.5 mL of 2.5% glutaraldehyde and 0.2 mL of 2mol / L H 2 SO 4 Carry out immobilization to make it form a gel, which can be cut into small cube-shaped monolithic visible light photocatalysts of a certain size as required, and the degradation rate of the prepared supported visible light photocatalyst to RhB solution is 60.1%.

Embodiment 3

[0024] At room temperature, weigh PVP and PVA according to the mass ratio of 1:2, add deionized water to dissolve, heat and stir in a water bath at 90°C until completely dissolved, and maintain this temperature, according to PVP-PVA:Ag / AgBr / TiO 2 Add Ag / AgBr / TiO at a mass ratio of 1:0.5 2 (Mesoporous) photocatalyst powder, so that it is uniformly dispersed in the mixed solution of PVA and PVP. After cooling to room temperature, add 0.6mL 2% genipin and 0.2mL 2mol / L HCl for immobilization to form a gel, which can be cut into small cube-shaped monolithic visible light photocatalysts of a certain size as required. The degradation rate of the prepared supported visible light photocatalyst to RhB solution was 51.6%.

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Abstract

The invention relates to a load type visible light photocatalyst and a preparation method thereof. Polyvinylpyrrolidone (PVP) and polyving akohol (PVA) are weighed according to the mass ratio at the room temperature, deionized water is added for dissolution, the PVP and the PVA are heated in a water bath at 90 DEG C and stirred till the PVP and the PVA are completely dissolved, Ag / AgBr / TiO2 visible light photocatalyst powder is added while the temperature is maintained, and the Ag / AgBr / TiO2 visible light photocatalyst powder is evenly dispersed into the PVA and PVP mixed solution; and after the solution is cooled to the room temperature, a cross-linking agent and a catalyst are added for immobilization, gel is formed, and the gel can be cut into small cubic integrated visible light photocatalysts of certain sizes as needed. By the adoption of the load type visible light photocatalyst and the preparation method thereof, the problems that a powder material is difficult to recycle, secondary pollution is caused, and the photocatalysis efficiency is low after immobilization are solved, and the load type visible light photocatalyst and the preparation method thereof are used for the field of treatment of water pollution which is difficult to treat and is high in organic matter content. Complex hydrogel carriers have higher moisture content and have better diffusivity to the visible light photocatalyst powder, the contact area between the powder and organic matter is increased, the photocatalysis efficiency of the visible light photocatalyst is improved, and recycling and reutilization are achieved.

Description

technical field [0001] The invention relates to a preparation method of a supported visible light photocatalyst, which can be used in the field of water pollution treatment. Background technique [0002] As the seriousness of my country's water environment pollution has become increasingly prominent, conventional water treatment processes are not efficient in treating organic pollution in many types of industrial wastewater, and are prone to react to produce by-products, causing secondary pollution. Nanophotocatalytic oxidation technology is a wastewater treatment technology that has been studied more in recent years. It not only has a wide range of applications, fast degradation rate, no secondary pollution, high efficiency, energy saving and environmental protection, but also mild reaction conditions and low operating costs. research hotspots in the field. [0003] Titanium dioxide, as a wide bandgap semiconductor, is one of the promising green catalysts because of its hi...

Claims

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Application Information

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IPC IPC(8): B01J31/30C02F1/30C02F101/30
CPCC02F1/30B01J31/30B01J37/0009C02F2101/30B01J35/23B01J35/39
Inventor 何丹农童琴严良高小迪代卫国金彩虹
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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