Tungsten trioxide-titanium dioxide composite photocatalyst for degrading formaldehyde

Abstract

The invention relates to preparation of a composite photocatalyst and particularly relates to a composite photocatalyst loading P25 type nanometer TiO2-WO3 composite on nickel foam with a large specific surface area and having a good catalytic degradation effect. The preparation method comprises: dissolving ammonium tungstate in hot ammonia water, wet grinding the solution with P25, soaking and loading the product on nickel foam, drying the product at 100 DEG C, and calcining the product at 500 DEG C for 1 h to obtain a nickel foam loaded WO3 / P25 photocatalytic material. The preparation method provided by the invention is simple, no expensive equipment is needed, the cost of the raw materials is low, the mechanical property is good; the photocatalytic degradation speed of the prepared catalyst is greatly improved compared with that of P25, and the prepared catalyst is used for degrading such harmful gases indoors or in automobiles as formaldehyde, and the like, and effectively solving the problems that a powdery photocatalyst is difficult to recycle and regenerate after being used.

Description

technical field [0001] The invention belongs to the field of photocatalysis, in particular to nickel foam as a load substrate, WO 3 The preparation method of the composite P25 photocatalytic material, and its ability to degrade formaldehyde. Background technique [0002] Photocatalytic oxidation has become the most promising air purification technology because of its simple technical operation, mild conditions, low energy consumption, and no secondary pollution. Among them, nano-TiO 2 Semiconductor has become a research hotspot in many photocatalysts because of its good chemical stability, corrosion resistance, high activity, low cost, non-toxicity, and no secondary pollution. But TiO 2 The band gap is wide, and only a small amount of ultraviolet light can be absorbed; at the same time, the photon quantum efficiency is low, and it is not easy to recycle and reuse. As a result, its application prospects are limited. Overall, nano-TiO 2 There are still several important ...

AI Technical Summary

Problems solved by technology

[0003] (1) TiO 2 The band gap is wide, which is 3.2ev. It can only absorb and utilize ultraviolet light with a wavelength of less than 380nm, which accounts for only 3% to 5% of sunlight, and the utilization rate of light is low;

[0004] (2) Nano-TiO 2 The photogenerated electrons and holes of the semiconductor are easy to recombine, resulting in TiO 2 The photogenerated carrier efficiency is low;

[0005] (3) Nanoscale TiO 2 Photocatalyst powder is used in air purifiers, which is inconvenient to disassemble and recycle

[0009] Patent Documents: 201010240649 and 200910303193 use tetrabutyl titanate as titanium source and prepare nano-TiO by sol-gel method 2 , the reaction conditions are complicated, which increases the difficulty of the preparation process and makes it difficult to realize industrial production

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