Principle of photocatalytic oxidation process

1. Photocatalytic oxidation is a catalytic reaction that occurs under the action of visible light from the outside. The photocatalytic oxidation reaction uses semiconductors and air as catalysts, and light as energy to degrade organic matter into CO2, H2O, and other non-toxic and harmless components. Our company uses artificial ultraviolet light waves as energy, combined with our specially treated nano TiO2 catalyst with the strongest activity and highest reaction efficiency. After treatment, the waste odor gas can achieve a more ideal purification effect.

In the semiconductor photocatalytic oxidation reaction, ultraviolet light is irradiated onto the nano TiO2 catalyst, which absorbs light energy to generate electron and hole jumps. After further binding, electron hole pairs are generated, which react with the adsorbed water (H2O) and oxygen (O2) on the surface of the exhaust gas to generate highly reactive hydroxyl radicals (OH -) and superoxide ion radicals (O2-, 0-). It can reduce various organic waste gases such as aldehydes, benzenes, ammonia, nitrogen oxides, sulfides, and other VOC organic and inorganic substances to carbon dioxide (CO2), water (H2O), and other non-toxic and harmless substances through photocatalytic oxidation. After purification, the waste gas molecules are activated and degraded, and the odor disappears at the same time, playing a role in waste gas deodorization. At the same time, it can effectively remove bacteria and viruses that grow in the pipeline,

Due to the absence of any additives in the photocatalytic oxidation reaction process, there will be no secondary pollution. In terms of operating costs, only electrical energy is used, and there is no need to frequently replace parts. This is quite energy-saving and environmentally friendly for enterprises to use.

Characteristics of photocatalytic oxidation

(1) Suitable environment for photocatalytic oxidation: Photocatalytic oxidation is suitable for completely oxidizing and purifying toxic and harmful odorous components such as exhaust gas odor into low molecular weight components that are non-toxic and harmless at room temperature. It is suitable for treating high concentration (uniform concentration can be achieved through pre-treatment), large gas volume (equipment can be combined for treatment), and strong molecular structure stability of toxic and harmful gases.

(2) Effective and thorough purification: Organic waste gas in the air can be directly oxidized into non-toxic and harmless substances through photocatalytic oxidation, leaving no secondary pollution,

(3) Efficient and energy-saving: Photocatalytic oxidation uses the vacuum wave ultraviolet light generated by artificial ultraviolet lamps as energy to activate photocatalysts and drive oxidation-reduction reactions. Moreover, photocatalysts are not consumed during the reaction process. The use of water and oxygen on the surface of exhaust gas odor as oxidants effectively degrades toxic organic waste gases has become the biggest feature of photocatalytic efficient purification and energy conservation.

(4) Strong oxidizing property: Semiconductor photocatalysis has the characteristic of strong oxidizing property, which can effectively decompose certain organic compounds that are difficult to oxidize by ozone, such as chloroform, carbon tetrachloride, hexachlorobenzene, and ultimately reduce them to carbon dioxide (CO2), water (H2O), and other non-toxic and harmless substances. Therefore, it has special significance for organic compounds that are difficult to degrade. The effective oxidants for photocatalysis are hydroxyl radicals (OH -) and superoxide ion radicals (O2-, O -), which have higher oxidizing property than common ozone, hydrogen peroxide, potassium permanganate, hypochlorous acid, etc.

(5) Broad spectrum: Photocatalytic oxidation is effective for a wide range of organic compounds, from hydrocarbons to carboxylic acids. Even for atomic organic compounds such as halogenated hydrocarbons, dyes, nitrogen-containing organic compounds, and organophosphorus insecticides, it has good removal effects. As long as a certain reaction time and reaction environment ratio are reached, complete oxidation can be achieved. It can be said that the oxidation target of hydroxyl radicals has almost no selectivity and can react with any existing substance.