Composite photo-catalytic material with visible light catalytic activity and preparation thereof

Abstract

The invention discloses a composite photo-catalyst material with a visible-light catalytic activity and a preparation method thereof, which is characterized in that 1 to 10 portions of dry titanium dioxide particles and 30 to 300 portions of chloroform are put into a single-neck flask with a drying tube, after being dispersed fully, 0.01 to 0.05 portion of conjugated polymer monomer which is put into the single-neck flask is stirred magnetically for 30 to 60 minutes, and then 0.1 to 5 portions of waterless ferric chloride which is put into the flask react for 4 to 8 hours under an ice bath, black solid products can be obtained after filtering, the black solid products are washed by methanol until the methanol is colorless, then products are dried in vacuum under a room temperature and the composite photo-catalyst material can be obtained. The composite photo-catalyst material obtained by adopting the preparation method of the invention can absorb visible lights, and is provided with the light catalytic activity under the radiation of the visible lights and can degrade organic pollutants effectively.

Description

1. Technical field [0001] The invention relates to a composite photocatalytic material with high catalytic activity under visible light irradiation and a preparation method thereof. 2. Background technology [0002] Since Fujishima and Honda discovered the photocatalytic decomposition of water on the n-type titanium dioxide semiconductor electrode in 1972, titanium dioxide has received widespread attention. In 1976, Garey used titanium dioxide photocatalyst to remove the chlorine in polychlorinated biphenyls, and in 1977, Frank photocatalytically oxidized CN - for OCN - According to the principle of separation of photo-generated electrons and holes generated by light-excited semiconductors to decompose and mineralize organic pollutants, that is, the research on the application of photocatalytic technology in environmental protection has begun. Photocatalytic degradation is a new method for treating pollutants, which has the following advantages: (1) complete mineralization...

AI Technical Summary

Problems solved by technology

[0003] However, anatase titanium dioxide has its own defects as a photocatalyst.

First of all, the photogenerated electrons and holes of titanium dioxide are very easy to recombine, resulting in a decrease in photon quantum efficiency; secondly, the powder of titanium dioxide is poorly dispersed in the organic matrix, easy to agglomerate, and the scope of use is limited; in addition, the bandgap width of titanium dioxide is 3.2ev , the corresponding excitation wavelength is 387nm, which belongs to the ultraviolet region, and the solar radiation energy actually reaching the surface is concentrated in the wavelength range of 460-500nm, and the ultraviolet component (200-400nm) is less than 5%. From the perspective of utilizing solar energy, it is the most economical and practical The photocatalyst should be able to use the abundant visible part of sunlight to replace expensive artificial light sources

In recent years, people have studied a variety of methods to solve the above problems, mainly including noble metal deposition, ion doping, semiconductor coupling and dye photosensitization; these methods have improved the photocatalytic activity of titanium dioxide to a certain extent and expanded the photoresponse range of titanium dioxide, but It does not solve the difficulties of application and processing in organic media due to morphological defects

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