Excitation of metal-free graphitic carbon nitride (g-C3N4) under visible light can successfully achieve efficient activation of peroxymonosulfate (PMS). Synergistic effects and involved mechanism were systematically investigated using a light-inert endocrine disrupting compound, dimethyl phthalate (DMP), as the target pollutant. Under visible light irradiation, DMP could not be degraded by direct g-C3N4-mediated photocatalysis, while in the presence of PMS, the dominant radicals were convert-ed from ?O2 to SO4?– and ?OH, resulting in effective DMP degradation and mineralization. Results showed that higher dosage of PMS or g-C3N4 could increase the activation amount of PMS and cor-responding DMP degradation efficiency, but the latter approach was more productive in terms of making the most of PMS. High DMP concentration hindered effective contact between PMS and g-C3N4, but could provide efficient use of PMS. Higher DMP degradation efficiency was achieved at pH lower than the point of zero charge (5.4). Based on intermediates identification, the DMP degra-dation was found mainly through radical attack (?OH and SO4?–) of the benzene ring and oxidation of the aliphatic chains. ? 2020, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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