Activation of peroxymonosulfate by α-MnO2 for Orange Ⅰ removal in water

Yusong Yang; Ying Zhao; Yuan Zong; Ruiqi Wu; Mingyi Zhang; Jing Feng; Tong Wei; Yueming Ren; Jun Ma

doi:10.1016/j.envres.2022.112919

Activation of peroxymonosulfate by α-MnO₂ for Orange Ⅰ removal in water

Environ Res. 2022 Jul:210:112919. doi: 10.1016/j.envres.2022.112919. Epub 2022 Feb 11.

Authors

Yusong Yang¹, Ying Zhao¹, Yuan Zong¹, Ruiqi Wu¹, Mingyi Zhang², Jing Feng¹, Tong Wei¹, Yueming Ren³, Jun Ma⁴

Affiliations

¹ Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China.
² Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, School of Physics and Electronic Engineering, Harbin Normal University, Harbin, 150025, China.
³ Key Laboratory of Superlight Materials and Surface Technology, Ministry of Education, College of Materials Science and Chemical Engineering, Harbin Engineering University, Harbin, 150001, China. Electronic address: renyueming@hrbeu.edu.cn.
⁴ State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China. Electronic address: majun@hit.edu.cn.

PMID: 35157919
DOI: 10.1016/j.envres.2022.112919

Abstract

Developing high-efficiency catalysts for peroxymonosulfate (PMS)-based advanced oxidation processes is important for eliminating pollutants in water. Herein, α-MnO₂ with major exposed {110} and {100} facets prepared via a hydrothermal method were used as catalysts to activate PMS for the degradation of Orange Ⅰ (OⅠ). α-MnO₂-100, with more abundant surface hydroxyl groups and greater reductive ability, performed remarkably better than α-MnO₂-110 for degrading OⅠ. OⅠ removal of 86.20% was obtained in the α-MnO₂-100/PMS system. The apparent rate constant of OⅠ removal over α-MnO₂-100 was 2.11 times higher than that of α-MnO₂-110. The effects of PMS concentration, catalyst dosage, OⅠ concentration, initial pH, anions and humic acid (HA) on OⅠ degradation in the α-MnO₂-100/PMS system were systematically investigated. Quenching experiments and electron paramagnetic resonance (EPR) demonstrated that SO₄^•^-, •OH, O₂^•^- and ¹O₂ were the reactive oxygen species (ROS) in the α-MnO₂-100/PMS system. Moreover, the possible degradation pathway of OⅠ in the α-MnO₂-100/PMS system was proposed. This work provides an ideal metal oxide catalyst for sewage remediation.

Keywords: Advanced oxidation process; Crystal facet; Peroxymonosulfate; Surface hydroxyl; α-MnO(2).

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Citrus sinensis*
Manganese Compounds*
Oxides
Peroxides
Water

Substances

Manganese Compounds
Oxides
Peroxides
Water
peroxymonosulfate