Abstract
The peroxymonosulfate (PMS) oxidation processes have received considerable attention for water treatment. The influence of monohydrogen phosphate and dihydrogen phosphate on PMS system is still controversial. A biochar activated PMS system was constructed to investigate the HPO42−/H2PO4− effects on sulfamethoxazole degradation. Results showed that the presence of H2PO4− inhibited PMS activation, while the co-existing HPO42− played a positive role. Therefore, it might be inaccurate to assess the activation capacity of a catalyst for PMS activation when using phosphate as a buffer solution. Importantly, H2PO4− inhibited the function of CO, pyridine N and defects for PMS activation. However, HPO42− promoted CO and graphitic N sites for sulfamethoxazole (SMX) degradation. The contributions of OH and SO4− to SMX degradation decreased with the increase of H2PO4− concentration. The production of SO4− was accelerated with the increase of HPO42− concentration, promoting pollutants degradation. The contribution of 1O2 first increased and then decreased with the rise of HPO42−/H2PO4− concentration. This study elucidated the roles of H2PO4− and HPO42− in PMS system and revealed the corresponding specific influence mechanisms, promoting the application of PMS systems for antibiotic wastewater purification.
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