Vanadium pentoxide/titanium dioxide composite photocatalyst for degrading formaldehyde

Abstract

The invention relates to preparation of a composite photocatalyst, and particularly relates to a photocatalytic material which is formed by loading a P25 type nano TiO2 / V2O5 composite on foamed nickel having large specific surface area and has high catalytic degradation performance. The preparation method comprises the following steps: dissolving ammonium metavanadate in water, performing wet milling together with P25, impregnating, loading onto the foamed nickel, drying, and calcining at 500 DEG C for 1 hour, thus obtaining the foamed nickel loaded V2O5 / P25 photocatalytic material. According to the invention, the preparation method is simple; no expensive equipment is required; the raw materials are low in price; the mechanical performance is favorable; and the photocatalytic degradation rate and visible light response range of the prepared catalyst are greatly improved in comparison with P25. When the composite photocatalyst is used for degrading harmful gas such as formaldehyde and the like in rooms and automobiles, the problems that the powdery photocatalyst is difficult to recover and regenerate after use and the like can be avoided.

Description

technical field [0001] The invention belongs to the field of photocatalysis, and specifically involves using foamed nickel as a load substrate, V 2 o 5 Preparation method of composite titanium dioxide 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 Ther...

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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