a hydrophobic tio 2 Preparation method of visible light catalyst

Abstract

The invention discloses a hydrophobic TiO 2 A preparation method of a visible light catalyst, using the strong adsorption properties of attapulgite after irradiation with hydrophobic high-energy electron beams and the doping modification of surface-transferring metal cations to prepare TiO with hydrophobicity, high adsorption and wide spectral response 2 Composite visible light catalyst to solve TiO 2 Photocatalysts have no adsorption and enrichment ability and narrow spectral response range for strongly hydrophobic organic pollutants. The novel hydrophobic TiO 2 Visible photocatalytic materials have the ability to efficiently enrich strongly hydrophobic organic pollutants and degrade them with visible light, and can be used for indoor and industrial low-concentration VOCs, photodegradation of strongly hydrophobic organic substances in water and soil.

Description

technical field [0001] The invention belongs to the technical field of preparation of visible light-responsive photocatalytic materials, and specifically relates to a high-adsorption performance and wide-spectrum hydrophobic TiO 2 Preparation method of visible light catalyst. Background technique [0002] Titanium-based semiconductors are important materials in the field of photocatalysis and can be widely used in environmental and energy fields such as catalytic degradation and hydrogen production. However, the spectral response range of titanium-based semiconductors is narrow, and only 5% of the ultraviolet light in the solar spectrum can be used, resulting in a solar energy utilization rate of only about 1%. Subsequently, workers in the field also developed new visible light-responsive titanium-based photocatalysts modified by noble metal deposition, semiconductor recombination or dye photosensitization, but these modified titanium-based photocatalytic materials have low...

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Problems solved by technology

However, the spectral response range of titanium-based semiconductors is narrow, and only 5% of the ultraviolet light in the solar spectrum can be used, resulting in a solar energy utilization rate of only about 1%.

Subsequently, workers in the field also developed new visible light-responsive titanium-based photocatalysts modified by noble metal deposition, semiconductor recombination or dye photosensitization, but these modified titanium-based photocatalytic materials have low specific surface area and a large number of hydroxyl groups on the surface. There is basically no adsorption capacity for hydrophobic organic pollutants, which directly affects its photocatalytic degradation efficiency

[0003] At present, for the problem of narrow spectral response range, those skilled in the art use metal (Fe 3+ 、Al 3+ , Zn 2+ etc.) or non-metal element (N) doping, semiconductor heterojunction compounding and other technical means to achieve the widening of the spectral response range, but the prepared photocatalyst has the problems of hydrophilicity, oil repellency and low specific surface area, which is difficult to be applied to strong photocatalysts. Adsorption and degradation of hydrophobic organic pollutants (such as pesticide pollutants, polycyclic aromatic hydrocarbon pollutants, etc.)

In this regard, workers in the field chemically modify titanium-based photocatalysts with surfactants (such as silyl groups) with hydrophobic groups to solve their hydrophilic problems; prepare mesoporous, hollow or nano-film titanium-based photocatalysts by templating , to solve the problem of its low adsorption capacity, but its preparation conditions are harsh and the cost is high

Although the above methods have solved the problems of spectral response range, hydrophobicity and specific surface area to varying degrees, it is difficult to solve the problem of hydrophilicity and improve its adsorption capacity while broadening its spectral response range. In addition, many The use of chemical modification reagents and the low adsorption performance of degradation intermediate products will bring multiple pollution to the environment and even reduce the degradation efficiency of titanium-based photocatalysts.

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