Photoactivation preparation method for nano-AgCl/Ag visible-light catalyst

Abstract

The invention belongs to the technical field of sewage treatment, specifically relates to a preparation method for a high activity catalyst with visible-light response ability, and an application of the catalyst in degradation of organic dyes. According to the preparation method, AgCl nanoparticles are firstly prepared in an ethylene glycol solvent with an assistant effect of polyvinylpyrrolidone; then the partial AgCl is subjected to photoreduction to form Ag nanoparticles by illumination so as to obtain the nano-AgCl / Ag composite photocatalyst. According to the present invention, the preparation method has characteristics of simpleness, fastness, mild conditions and high yield; the prepared product has high catalytic efficiency and strong light corrosion resistance, and still maintains the high catalytic activity after repeatedly using the product six times; the catalyst of the present invention does not require the special light source, and can performs the catalytic operation under sunlight or ordinary sunlight lamp simulating the sunlight, and the degraded products are CO2 and H2O, such that the catalytic operation has characteristics of simpleness, no toxic and side-effect, and short time, wherein the 100% degradation of the organic dye can be completed in 15-30 minutes.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to the preparation of a highly active catalyst with visible light response performance and a method for degrading organic dyes. Background technique [0002] Since the 20th century, while enjoying the comfort and convenience brought by rapid development, human beings have also tasted the bitter fruit of the deteriorating living environment caused by over-exploitation of resources and environmental pollution, such as global warming, frequent extreme weather conditions, biodiversity The sharp decline of land, land desertification, and various forms of environmental pollution, etc., among which environmental pollution has become a major problem that threatens human reproduction and survival. Therefore, controlling pollution, protecting the environment, maintaining ecological balance and realizing sustainable development have become the consensus of the internationa...

AI Technical Summary

Problems solved by technology

[0007] But TiO 2 Semiconductors such as ZnO or ZnO are basically wide bandgap semiconductors. The light absorption wavelength is mainly in the ultraviolet region, and the range is narrow. Only ultraviolet light accounting for 4% of the solar spectrum range can be used, and the effective utilization rate of solar energy is low. To obtain better If the catalytic effect is high, a special high-pressure mercury lamp must be used to provide high-energy ultraviolet light for catalysis, which not only increases energy consumption, but also easily causes harm to the operator. Therefore, special catalytic and protective equipment is required to complicate the catalytic process.

Other narrow-bandgap semiconductors (such as CdS) can catalyze in response to visible light, but they are very prone to photobleaching and deactivation, making it difficult to realize multiple recycling of catalysts.

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