Recent advances in cobalt-activated sulfate radical-based advanced oxidation processes for water remediation: A review

Jifei Hou; Xiudan He; Shengqi Zhang; Jialin Yu; Mingbao Feng; Xuede Li

doi:10.1016/j.scitotenv.2021.145311

Recent advances in cobalt-activated sulfate radical-based advanced oxidation processes for water remediation: A review

Sci Total Environ. 2021 May 20:770:145311. doi: 10.1016/j.scitotenv.2021.145311. Epub 2021 Jan 21.

Authors

Jifei Hou¹, Xiudan He¹, Shengqi Zhang², Jialin Yu¹, Mingbao Feng³, Xuede Li⁴

Affiliations

¹ School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China.
² College of Environment & Ecology, Xiamen University, Xiamen 361102, China.
³ College of Environment & Ecology, Xiamen University, Xiamen 361102, China. Electronic address: mfeng24@xmu.edu.cn.
⁴ School of Resources and Environment, Anhui Agricultural University, Hefei 230036, China. Electronic address: xuedel@ahau.edu.cn.

PMID: 33736411
DOI: 10.1016/j.scitotenv.2021.145311

Abstract

Sulfate radical-based advanced oxidation processes (SR-AOPs) have attracted increasing attention for the degradation of organic contaminants in water. The oxidants of SR-AOPs could be activated to generate different kinds of reactive oxygen species (ROS, e.g., hydroxyl radicals (OH), sulfate radicals (SO₄^-), singlet oxygen (¹O₂), and superoxide radicals (O₂^-)) by various catalysts. As one of the promising catalysts, cobalt-based catalysts have been extensively investigated in catalytic activity and stability during water remediation. This article mainly summarizes recent advances in preparation and applications of cobalt-based catalysts on peroxydisulfate (PDS)/peroxymonosulfate (PMS) activation since 2016. The review covers the development of homogeneous cobalt ions, cobalt oxides, supported cobalt composites, and cobalt-based mixed metal oxides for PDS/PMS activation, especially for the latest nanocomposites such as cobalt-based metal-organic frameworks and single-atom catalysts. This article also discussed the activation mechanisms and the influencing factors of different cobalt-based catalysts for activating PDS/PMS. Finally, the future perspectives on the challenges and applications of cobalt-based catalysts are presented at the end of this paper.

Keywords: Activation mechanisms; Cobalt-based catalysts; Organic removal; Peroxydisulfate/peroxymonosulfate activation; Water remediation.

Publication types

Review