Phototransformation of 4-phenoxyphenol sensitised by 4-carboxybenzophenone: Evidence of new photochemical pathways in the bulk aqueous phase and on the surface of aerosol deliquescent particles

摘要: Abstract In addition to direct photolysis, degradation of organic compounds by solar light can also occur indirect photolysis or photo-sensitised processes. These reactions are important because they involved in, among others, and climate changes, adverse health effects from inhaled particles, on cloud chemistry ozone production. this work, the importance atmospheric photo-sensitisation is evaluated in bulk aqueous solution surface aerosol deliquescent particles. Irradiation experiments indicate that 4-carboxybenzophenone (CBP) able photosensitise 4-phenoxyphenol (4 PP). The process takes place via CBP triplet state ( 3 CBP*), which has an oxidising nature. 4 PP fluorescent, unlike photosensitiser CBP, with two emission bands at ∼320 ∼380 nm. However, a considerably decreases intensity fluorescence causes very intense new band appear ∼420 nm. This behaviour suggests possible interaction between solution, could favour further light-induced Moreover, overlaps spectrum HULIS (HUmic-LIke Substances), suggesting supramolecular photosensitiser–substrate interactions may have role properties. coated silica particles (gas–solid system) was investigated under simulated sunlight, presence variable relative humidity. water molecules inhibit 4 PP, induced CBP* indicating be even faster than solution. We demonstrate phenol substances adsorbed surfaces substantially altered upon photosensitised