Algal Extracellular Organic Matter Induced Photochemical Oxidation of Mn(II) to Solid Mn Oxide: Role of Mn(III)-EOM Complex and Its Ability to Remove 17α-Ethinylestradiol

• DOI: 10.1021/acs.est.3c07970
• Publication Date: 2024-03-21T09:37:14Z
• Authors: Zhicheng Liao; Huan He; Yiying Wang; Feiyuan Liu; Danni Cui; Jingye Cui; Ziwei Guo; Chaochao Lai; Bin Huang; Hongwen Sun; Xuejun Pan
• Keywords: Photosensitizing Agents; Manganese Compounds; Water; Oxides; Ethinyl Estradiol; Oxidation-Reduction

Photosensitizer-mediated abiotic oxidation of Mn(II) can yield soluble reactive Mn(III) and solid Mn oxides. In eutrophic water systems, the ubiquitous algal extracellular organic matter (EOM) is a potential photosensitizer may have substantial impact on Mn(II). Herein, we focused investigating photochemical process from to oxide driven by EOM. The results irradiation experiments demonstrated that generation intermediate was crucial for successful photo oxidization mediated EOM serve as both ligand, facilitating formation Mn(III)-EOM complex. complex exhibited excellent efficiency in removing 17α-ethinylestradiol. Furthermore, underwent decomposition result reactions with intermediates, forming oxide. presence nitrate enhance process, conversion then This study deepens our grasp geochemical processes its micropollutant fate.