Two kinetic processes of ultraviolet decomposition of formaldehyde: One is directly interrupted by ultraviolet light for photolysis; The second is the interaction between ultraviolet radiation and water in the air OH free radical, Decompose formaldehyde. (Mercury lamp tube can) . Deep ultraviolet radiation can directly decompose organic pollutants such as formaldehyde by breaking the chemical bonds of formaldehyde.
Can deep ultraviolet light decompose organic pollutants such as formaldehyde? Actually, many people think it shouldn't work, But in reality, it is possible. O-O What is the key energy of a key 5. 1eV correspond to 243nm, But it must be present in organic matter C-H The key energy is 4. 31eV, correspond to 283nm, C-O then it is 3. 39eV correspond to 366nm. Ultraviolet photons with energy higher than bond energy can be broken, Just like it destroys DNA A principle of molecular chain, So ultraviolet radiation can decompose formaldehyde.
But we also need to pay attention to it, The decomposition process of formaldehyde is actually very complex, Its two cracking processes are directly related to the size of the wavelength. Quantum yield changes of formaldehyde decomposition process at different wavelengths. Although I don't understand what the two peaks are 305nm and 340nm, But there is no doubt that, Ultraviolet radiation can decompose formaldehyde on its own. Analogous to toluene, TVOC, Ultraviolet radiation can decompose.