Oxygen vacancy-mediated peroxydisulfate activation and singlet oxygen generation toward 2,4-dichlorophenol degradation on specific CuO1-x nanosheets

Meilan Pan; Shuang-Yin Tang-Hu; Cong Li; Jianheng Hong; Subiao Liu; Bingjun Pan

doi:10.1016/j.jhazmat.2022.129944

Oxygen vacancy-mediated peroxydisulfate activation and singlet oxygen generation toward 2,4-dichlorophenol degradation on specific CuO_1-x nanosheets

J Hazard Mater. 2023 Jan 5:441:129944. doi: 10.1016/j.jhazmat.2022.129944. Epub 2022 Sep 12.

Authors

Meilan Pan¹, Shuang-Yin Tang-Hu¹, Cong Li¹, Jianheng Hong¹, Subiao Liu², Bingjun Pan³

Affiliations

¹ College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China.
² School of Minerals Processing and Bioengineering, Central South University, Changsha, Hunan 410083, China.
³ College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China. Electronic address: bjpan@zjut.edu.cn.

PMID: 36116314
DOI: 10.1016/j.jhazmat.2022.129944

Abstract

Durable and stable removal of 2,4-dichlorophenpl (2,4-DCP) by CuO_1-x nanosheets is reported. CuO_1-x nanosheets were fabricated by a simple defect engineering strategy and greatly increased the efficiency of peroxydisulfate (PDS) activation to improve 2,4-DCP removal by introducing abundant oxygen vacancy (V_o) to produce an electron-rich surface. Results showed that CuO_1-x nanosheets exposed more V_o as active sites for PDS activation as compared with that of CuO nanoparticles, giving rise to dramatic enhancement of catalytic performance with ultrahigh reaction rate that is qualified for serving in flow filtration system, completely degrading 100 mg L^-¹ of 2,4-DCP within 3 s of residence time. Besides, experimental studies confirmed that ¹O₂ generated by V_o - mediated PDS activation plays the dominate role in the degradation of contaminants. Relative to the previously reported CuO/PDS systems, the obtained CuO_1-x nanosheets demonstrated 2.7 times higher specific PDS activity and 67 times higher specific CuO activity for 2,4-DCP removal. Our study not only improves the fundamental understanding of active sites in morphologically tunable metal oxides but also proposes a guideline for future research and engineering application of persulfate.

Keywords: CuO(1−x) nanosheets; Flowing degradation; Oxygen vacancy; Peroxydisulfate activation; Singlet oxygen.

Publication types

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

MeSH terms

Chlorophenols
Copper
Oxidation-Reduction
Oxides
Oxygen*
Phenols
Singlet Oxygen* / chemistry

Substances

Chlorophenols
Oxides
Phenols
sulfonated 2,4-dichlorophenol
Singlet Oxygen
Copper
2,4-dichlorophenol
Oxygen
cupric oxide