Embedding Co in perovskite MoO3 for superior catalytic oxidation of refractory organic pollutants with peroxymonosulfate

Qingyi Zeng; Jing Tan; Beibei Gao; Tao Cai; Qingyan Zhang; Yi-Lin Liu; Sheng Chang; Shuaifei Zhao; Suqing Wu

doi:10.1016/j.chemosphere.2022.137726

Embedding Co in perovskite MoO₃ for superior catalytic oxidation of refractory organic pollutants with peroxymonosulfate

Chemosphere. 2023 Feb:314:137726. doi: 10.1016/j.chemosphere.2022.137726. Epub 2022 Dec 31.

Authors

Qingyi Zeng¹, Jing Tan², Beibei Gao², Tao Cai², Qingyan Zhang², Yi-Lin Liu³, Sheng Chang⁴, Shuaifei Zhao⁵, Suqing Wu⁶

Affiliations

¹ School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan, 421001, China. Electronic address: qingyizeng@usc.edu.cn.
² School of Resources & Environment and Safety Engineering, University of South China, Hengyang, Hunan, 421001, China.
³ College of Mechanical Engineering, University of South China, Hengyang, Hunan, 421001, China. Electronic address: liuyilin@usc.edu.cn.
⁴ School of Energy & Power Engineering, Nanjing University of Aeronaut & Astronaut, Nanjing Jiangsu, 210016, China.
⁵ Deakin University, Geelong, Institute for Frontier Materials (IFM), VIC, 3216, Australia.
⁶ National and Local Joint Engineering Research Center of Ecological Treatment Technology for Urban Water Pollution, Key Laboratory of Zhejiang Province for Water Environment and Marine Biological Resources Protection, College of Life and Environmental Science, Wenzhou University, Wenzhou 325000, PR China.

PMID: 36596326
DOI: 10.1016/j.chemosphere.2022.137726

Abstract

A cobalt (Co)-doped perovskite molybdenum trioxide (α-MoO₃) catalyst (Co-MO) was synthesized by a facile pyrolysis strategy and used for degrading various organic contaminants via peroxymonosulfate (PMS) activation. The doped Co was inserted in the inter space between the octahedron [MoO₆], facilitating the growth of the α-MoO₃ crystal on the [010] direction. This unique structure accelerated the activation of PMS as the Co-MO could function as a carrier for electron transfer to facilitate the Co(II)/Co(III) cycle in the Co-MO/PMS system. As a result, the Co-MO/PMS system showed noticeable activity for removing 100% bisphenol A (BPA) under a broad conditions within 30 min. The radical quenching test and electron paramagnetic resonance analysis revealed that singlet oxygen (¹O₂) was the main active species for BPA degradation in the Co-MO/PMS system, while free radicals, such as O₂^•-, SO₄^•- and •OH, were also produced as the intermediate species. Furthermore, the carrier mechanism may enable the Co-MO/PMS system maintain relatively high performance during repeat use, and also excellent adaptability was revealed by the well function in various water matrices and high activity in degrading various refractory organic pollutants. Our findings pave a useful avenue for the rational design of novel cobalt-doped catalysts with high catalytic performance toward wide environmental applications.

Keywords: Bisphenol A; Co(II)/Co(III) cycle; Co-doping; MoO(3); Perovskite; Peroxymonosulfate activation.

MeSH terms

Cobalt*
Environmental Pollutants* / chemistry
Peroxides / chemistry

Substances

peroxymonosulfate
perovskite
Cobalt
Environmental Pollutants
Peroxides