Photoelectric coupling promotes the decomposition and purification method of gaseous pollutants

Abstract

The invention provides a method for promoting decomposition and purification of gas-phase pollutants through photoelectric coupling and belongs to the technical field of gas-phase pollutant purification treatment and energy-saving resource recycling. A conductive catalytic composite film electrode is formed on a stainless steel net by using a method of fixed coating of Pt / TiO2-ZnO and silica sol and connected with an anode, the conductive catalytic composite film member, the anode, an electrolyte solution and an outer resistor form a circuit loop, and an energy-saving efficient catalytic purification system for the gas-phase pollutants is formed by applying photoelectric action on the catalytic electrode. Degradation and purification of the gas-phase pollutants under action of photo-catalysis, electro-catalysis and photoelectric catalysis are realized respectively. Under assistant action of the catalytic film electrode and components, the system purifies and removes formaldehyde in air. Changing of the outer resistor has direct impact on purification effect of photo-catalysis and electro-catalysis. Under photo-catalysis or electro-catalysis, the system still can purify and degrade formaldehyde gas and generate power.

Description

technical field [0001] The invention belongs to the technical field of gas phase pollutant purification treatment and energy saving and resource utilization, and relates to Pt / TiO 2 -The preparation of ZnO nanocomposite catalysts, and photoelectric catalytic functional membrane components, and their photoelectric catalytic synergies, decompose and purify pollutants and generate electricity, and at the same time promote the degradation of VOCs in the air, which helps to improve air quality. Control indoor air pollution to play a role in promoting. Background technique [0002] The operating temperature of catalytic oxidation of formaldehyde is usually much higher than room temperature, and it is difficult to meet the requirements of normal temperature and pressure and low energy consumption required for indoor air purification. 2 O and CO 2 It is hoped to realize the practical application of catalytic oxidation technology in indoor air formaldehyde purification. The concen...

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Problems solved by technology

[0004] TiO 2 Heterogeneous photocatalysis has made great progress in the photocatalytic removal of water and gas phase organic and inorganic pollutants in the field of environmental protection, and is considered to be a promising deep purification technology for environmental pollution; TiO 2 With its good chemical stability, non-toxic, cheap and easy to obtain, it is known as an ideal photocatalyst for environmental governance; nano-TiO 2 Particles have the characteristics of large specific surface area and good diffusivity. TiO 2 The catalyst used as a carrier has the advantages of high activity, good selectivity, strong anti-poisoning, good low-temperature activity, adjustable surface acidity, and high-temperature reducibility; however, a single TiO 2 There are also some defects in the photocatalytic process, such as wide band gap, can only absorb ultraviolet light and low photocatalytic efficiency. For this purpose, the TiO 2 The research on compounding with other semiconductor materials is gradually increasing; related research shows that TiO 2 After compounding with other semiconductor materials, the synthesized composite materials often have better physical and chemical properties and photocatalytic activity than monomers.

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