Photocatalytic net for water purification and its preparation and application

Abstract

The invention relates to water purification materials and their preparation, in particular to photocatalytic nets for water purification and their preparation and application. The photocatalytic net for water purification is composed of a net plate made of metal aluminum or aluminum alloy, an oxide film layer evenly distributed on the surface of the net plate, and a photocatalyst coating attached to the outer surface of the oxide film layer. The preparation includes pretreatment of the screen, oxidation treatment, surface cleaning of the base material, carrying out photocatalyst loading on the base material by vacuum evaporation, annealing treatment and the like. The invention solves the technical problems of poor stability of the photocatalytic layer and high production cost in the prior art. It has the advantages of good photocatalytic performance and mechanical strength, firm coating adhesion, and low production cost.

Description

technical field [0001] The invention relates to water purification materials and their preparation, in particular to photocatalytic nets for water purification and their preparation and application. Background technique [0002] Since the promulgation of the national "Water Pollution Prevention and Control Action Plan" (hereinafter referred to as "Water Ten Measures") in 2015, water environment governance has gradually received more attention, especially the black and odorous water body governance is still facing a severe situation. According to the 2017 survey, 8.3% of the national surface water sections under national control are still inferior to category V. According to the requirements of the "Water Ten Measures", by 2030, the proportion of good water quality in the seven key river basins in the country will reach more than 75%, the black and odorous water bodies in urban built-up areas will be eliminated in general, and the water quality of urban centralized drinking w...

AI Technical Summary

Problems solved by technology

[0005] The photocatalytic net currently used in water treatment is made of polypropylene material as the base material and multi-layer coating method, which has the advantage of cheap and easy-to-obtain material. Floating balls and fixed rods, and the multi-layer coating method is likely to cause instability or even falling off between materials, causing secondary pollution to the environment

The second is that the photocatalytic network made of polypropylene material is made by the mixing method. Compared with the loading method, the coating layer is not easy to fall off. The disadvantage is that the utilization rate of the photocatalyst is not high, and the photocatalyst mixed inside the substrate cannot play a role role, resulting in a certain amount of waste

The disadvantage is that the production process is complicated, high-temperature calcination is required, energy consumption and cost are high, and the thickness of the photocatalytic network made by the sol method is relatively thick, resulting in a certain degree of waste

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