Modified birnessite MnO2 as efficient Fenton-like catalysts through electron transfer process between the simultaneously surface-activated peroxymonosulfate and pollutants

Xiuying Liu; Jiao Zhou; Qianna Xia; Bowen Li; Qiaohui Gao; Shuaiqi Zhao; Aimal Khan; Aihua Xu; Xiaoxia Li

doi:10.1016/j.jhazmat.2022.130178

Modified birnessite MnO₂ as efficient Fenton-like catalysts through electron transfer process between the simultaneously surface-activated peroxymonosulfate and pollutants

J Hazard Mater. 2023 Feb 5;443(Pt A):130178. doi: 10.1016/j.jhazmat.2022.130178. Epub 2022 Oct 13.

Authors

Xiuying Liu¹, Jiao Zhou¹, Qianna Xia¹, Bowen Li¹, Qiaohui Gao¹, Shuaiqi Zhao¹, Aimal Khan¹, Aihua Xu¹, Xiaoxia Li²

Affiliations

¹ School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, PR China.
² School of Chemistry and Chemical Engineering, Wuhan Textile University, Wuhan 430200, PR China; Hubei Provincial Engineering Laboratory for Clean Production and High Value Utilization of Bio-Based Textile Materials, Wuhan Textile University, Wuhan 430200, PR China. Electronic address: lixxwh@163.com.

PMID: 36252404
DOI: 10.1016/j.jhazmat.2022.130178

Abstract

The development of efficient and eco-friendly Mn-based hybrids for the degradation of biorefractory organic pollutants via peroxymonosulfate (PMS) activation is highly desired. In this study, a novel graphite nanosheet (GNs)-based Fe-Mn bimetallic oxide (Fe doped birnessite MnO₂, FeMn/GNs) was synthesized under mild conditions. Compared with monometallic Fe or Mn oxide on GNs, FeMn/GNs exhibited a higher surface area, decreased Mn oxidation states, stronger interaction with GNs, and more active sites for PMS adsorption. Among different Fe/Mn ratios, Fe₂Mn₁/GNs showed the optimum performance for bisphenol A (BPA) degradation with the first-order rate constant of 0.22 min^-1, which was about 8.5 and 12.9 times higher than that of Mn/GNs and Fe/GNs, respectively. Different from the pollutant-catalyst-PMS electron transfer mechanism for Mn/GNs, the direct two-electron transfer in FeMn/GNs+PMS system, was mainly processed between the simultaneously activated BPA and PMS. This was probably based on the double adsorption sites of Fe and Mn species on the same catalyst: PMS was adsorbed by Fe species through hydroxyl groups, while BPA was mainly coordinated with Mn species due to the layered structure and hydrophobicity of the Mn oxide. This study is expected to provide the rational design of efficient Mn-based hybrids for PMS activation.

Keywords: Birnessite MnO(2); Electron transfer; Fe doping; Graphite nanosheets; Peroxymonosulfate.

Publication types

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

MeSH terms

Electrons
Environmental Pollutants* / chemistry
Graphite* / chemistry
Manganese Compounds
Organic Chemicals
Oxides
Peroxides / chemistry

Substances

peroxymonosulfate
birnessite
Oxides
Environmental Pollutants
Manganese Compounds
Peroxides
Graphite
Organic Chemicals