Activating peroxymonosulfate by halogenated and methylated quinones: performance and mechanism.

ABSTRACT: Activation of peroxymonosulfate (PMS) by halogenated and methylated quinones for destroying sulfamethoxazole (SMX) was investigated, where 2,6-dimethyl-1,4-benzoquinone (DMBQ), 2,6-dichloro-1,4-benzoquinone (DCBQ), and tetrafluoro-1,4-benzoquinone (TFBQ) were chosen as model quinones. The PMS could be activated by halogenated and methylated quinones efficiently for SMX degradation, and the process showed high pH and quinones dependency. Different from PMS activated by ultraviolet (UV), singlet oxygen (¹O₂) instead of hydroxyl radical (˙OH) and sulfate radical (SO₄˙^-) was the primary oxidizing species in the activation process. The formation of ¹O₂ was confirmed by various quenching studies combined with chemical probes (9,10

SUBMITTER: Zhang H 

PROVIDER: S-EPMC9070648 | biostudies-literature | 2019 Aug

REPOSITORIES: biostudies-literature