Load type visible light photocatalyst and preparation method thereof

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...