Humic Acid Extracts Leading to the Photochemical Bromination of Phenol in Aqueous Bromide Solutions: Influences of Aromatic Components, Polarity and Photochemical Activity

Dissolved organic matter (DOM) is considered to play an important role in the abiotic transformation of organobromine compounds marine environment, for it produces reactive intermediates photochemically and recognized as a significant source halogen species seawater. However, due complex composition DOM, relationship between natural properties DOM its ability produce less understood. Here, humic acid (HA) was extracted fractionated based on polarity hydrophobicity using silica gel, influences different fractions (FA, FB FC) photochemical bromination phenol investigated. The structural HA were characterized by UV-vis absorption, Fourier transform infrared spectroscopy fluorescence spectroscopy, reactivity assessed probing triplet dissolved (3DOM*), singlet oxygen (1O2) hydroxyl radical (•OH). photo-bromination investigated aqueous bromide solutions under simulated solar light irradiation. FA with more aromatic polar contents enhanced than weaker FC. This could be attributed chemical three HAs’ their production •OH 3DOM*. Separating investigating components great significance assessment environmental impacts geochemical cycle halogen.