Removal of chlorophenols in the aquatic environment by activation of peroxymonosulfate with nMnOx@Biochar hybrid composites: Performance and mechanism

Tong Liu; Kangping Cui; Yihan Chen; Chenxuan Li; Minshu Cui; Hongjia Yao; Yawen Chen; Shanpeng Wang

doi:10.1016/j.chemosphere.2021.131188

Removal of chlorophenols in the aquatic environment by activation of peroxymonosulfate with nMnOx@Biochar hybrid composites: Performance and mechanism

Chemosphere. 2021 Nov:283:131188. doi: 10.1016/j.chemosphere.2021.131188. Epub 2021 Jun 14.

Authors

Tong Liu¹, Kangping Cui², Yihan Chen¹, Chenxuan Li¹, Minshu Cui¹, Hongjia Yao¹, Yawen Chen¹, Shanpeng Wang¹

Affiliations

¹ School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, PR China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei, 230009, PR China.
² School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, PR China; Key Laboratory of Nanominerals and Pollution Control of Higher Education Institutes, Hefei University of Technology, Hefei, 230009, PR China. Electronic address: cuikangping@hfut.edu.cn.

PMID: 34153906
DOI: 10.1016/j.chemosphere.2021.131188

Abstract

Functional nMnOx@RBC composites were synthesized via a simple co-precipitation method. The nanomaterials have efficient activity in activating peroxymonosulfate (PMS) for removal of chlorophenols (CPs). Rice husk biochar (RBC) could support nMnOx, and acted as an electron shuttle to mediate electron transfer reaction. nMnOx@RBC had superior catalytic and adsorption properties and exhibited remarkable synergistic effects. This led to complete degradation of 4-chloro-3-methyl phenol (CMP) in 60 min at the natural pH (7.0). Reactive oxygen species (ROS) were also identified via the corresponding scavengers. The results indicated that singlet oxygen (¹O₂) played a dominant role in the degradation of CMP within nMnOx@RBC system. Moreover, the mechanism of CMP decomposition was rationally proposed, and possible intermediate products were deduced. The high degradation performances of diverse CPs were also observed in nMnOx@RBC/PMS system. This research aims to offer novel insights into carbon-metal nanomaterials for the elimination of emerging pollutants.

Keywords: Biomass; Carbon-metal nanomaterials; Chlorophenols; Peroxymonosulfate; Singlet oxygen.

MeSH terms

Charcoal
Chlorophenols*
Peroxides

Substances

Chlorophenols
Peroxides
biochar
Charcoal
peroxymonosulfate