Photooxygenation technology is a method that utilizes the principle of photocatalytic oxidation to remove harmful substances from exhaust gases. This technology mainly relies on the catalytic effect of photocatalysts (usually titanium dioxide TiO ₂) under ultraviolet light irradiation, converting organic pollutants and other harmful substances in exhaust gas into harmless substances such as carbon dioxide and water.
Main application industries: pharmaceutical industry, waste gas containing organic solvents generated during the pharmaceutical process. In the chemical industry, remove organic waste gases emitted during the production process. Printing, painting and other industries: treating exhaust gases containing VOCs.
Its main working principle is:
1. Light excitation: When ultraviolet light is irradiated onto the surface of the photocatalyst, the photocatalyst is excited, producing electron hole pairs.
2. Catalytic reaction: Electron hole pairs react with oxygen and water vapor in the air to generate highly oxidizing free radicals (such as hydroxyl radicals · OH).
3. Pollutant degradation: These highly active free radicals can react with organic compounds (such as VOCs) and other pollutants in exhaust gas, oxidizing and decomposing them into harmless substances such as CO2 and H2O.
Its technical characteristics are high processing efficiency and the ability to achieve efficient oxidation and decomposition processes at lower temperatures. Widely applicable to various organic pollutants, including benzene derivatives, alcohols, ketones, and other VOCs.
The final products are mainly water and carbon dioxide, which are environmentally friendly and will not cause secondary pollution. Compared to other methods such as thermal oxidation, the operating cost of photocatalytic deodorization technology for exhaust gas is lower due to its low energy consumption.
However, photo oxidation of exhaust gas usually requires the use of ultraviolet light (UV-C band) to ensure sufficient energy to excite the photocatalyst. And suitable catalyst materials should be selected to ensure their good stability and activity during long-term use, and appropriate parameters such as light intensity, contact time, and humidity should be adjusted according to the specific composition of the exhaust gas to achieve the best treatment effect.
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