Abstract
Magnetic biochar is an efficient peroxymonosulfate (PMS) catalyst with high potential for industrial applications. However, the effects of phosphate on the active sites of magnetic biochar and oxidative species remain controversial. In this study, Enteromorpha-derived magnetic biochar was prepared for the activation of PMS. Results found that CO, COOH, defects, graphite N, Fe2+, and Fe0 were the main active sites in the magnetic biochar/PMS system. The presence of monohydrogen phosphate (HPO42−) had no effect on the activation of PMS. However, the existence of dihydrogen phosphate (H2PO4−) had a significant inhibitory effect and affected the production of free radicals, which was ascribed to the shielding effect of H2PO4− on graphite N, CO, COOH, Fe2+, and Fe0 active sites. Overall, this study provides insight into the main reaction mechanisms of PMS activation by magnetic biochar with co-existing phosphates, facilitating the application of magnetic biochar for practical wastewater purification in persulfate oxidation systems.
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