Synergistic multiple active species driven fast estrone oxidation by δ-MnO2 in the existence of methanol

Wenjing Zong; Zhaoming Guo; Minghuo Wu; Xianliang Yi; Hao Zhou; Siyuan Jing; Jingjing Zhan; Lifen Liu; Yang Liu

doi:10.1016/j.scitotenv.2020.143201

Synergistic multiple active species driven fast estrone oxidation by δ-MnO₂ in the existence of methanol

Sci Total Environ. 2021 Mar 20:761:143201. doi: 10.1016/j.scitotenv.2020.143201. Epub 2020 Oct 27.

Authors

Wenjing Zong¹, Zhaoming Guo², Minghuo Wu¹, Xianliang Yi¹, Hao Zhou³, Siyuan Jing¹, Jingjing Zhan¹, Lifen Liu¹, Yang Liu⁴

Affiliations

¹ Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Ocean Science and Technology, Panjin Campus, Dalian University of Technology, China.
² School of Life Science and Medicine, Panjin Campus, Dalian University of Technology, China.
³ Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Ocean Science and Technology, Panjin Campus, Dalian University of Technology, China. Electronic address: zhouhao@dlut.edu.cn.
⁴ Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Ocean Science and Technology, Panjin Campus, Dalian University of Technology, China. Electronic address: liuyang20180129@dlut.edu.cn.

PMID: 33158530
DOI: 10.1016/j.scitotenv.2020.143201

Abstract

Endocrine-disrupting chemicals (EDCs) cause serious threats to human health. Five types of MnO₂ were synthesized and characterized. They exhibited different removal performances for three EDCs, i.e., estrone (E1), ethynylestradiol (EE2) and bisphenol A (BPA). Only δ-MnO₂ can completely remove E1 within 120 min at pH 3.0. Free Mn (III) was determined at the beginning of the reaction and participated in the EDCs removal process. Electron spin resonance (ESR) indicated that δ-MnO₂ could produce superoxide anions (·O₂^-) and singlet oxygen (¹O₂) in the existence of methanol. The reactive oxygen species (ROS) quenching experiments showed ¹O₂ have certain contribution to the E1 removal by δ-MnO₂. The source of ROS is mainly the lattice oxygen from δ-MnO₂, and can be replenished through the layer structure destruction caused by the reaction between Mn(III) and E1. The ROS dependent EDCs removal by δ-MnO₂ leads to a deep understanding on this well-known oxidant.

Keywords: Endocrine-disrupting chemicals; Methanol; MnO(2); Reactive oxygen species.