Activation of dissolved molecular oxygen by Cu(0) for bisphenol a degradation: Role of Cu(0) and formation of reactive oxygen species

Jiajun Long; Longqian Xu; Linghui Zhao; Huaqiang Chu; Yunfeng Mao; Deli Wu

doi:10.1016/j.chemosphere.2019.125034

Activation of dissolved molecular oxygen by Cu(0) for bisphenol a degradation: Role of Cu(0) and formation of reactive oxygen species

Chemosphere. 2020 Feb:241:125034. doi: 10.1016/j.chemosphere.2019.125034. Epub 2019 Oct 3.

Authors

Jiajun Long¹, Longqian Xu², Linghui Zhao¹, Huaqiang Chu², Yunfeng Mao², Deli Wu³

Affiliations

¹ State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China.
² State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai, 200092, PR China.
³ State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science & Engineering, Tongji University, Shanghai, 200092, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, PR China. Electronic address: [email protected].

PMID: 31683430
DOI: 10.1016/j.chemosphere.2019.125034

Abstract

In this study, Cu(0) was synthesized with NaBH₄ as a reducing agent for Cu(II) and used to activate dissolved molecular oxygen (O₂) under acidic conditions. The Cu(0) synthesized had much higher activity than the purchased. The roles of Cu was clarified and the formation of reactive oxygen species was discussed through direct detection for the first time. By detecting the valence change of Cu in a CuO system, Bisphenol A (BPA) was found to accelerate the transformation of Cu(II) to Cu(I). Besides, the evidence from electron spin resonance (ESR) studies and scavenging tests revealed the new roles of Cu(0) that Cu(0) could not only convert O₂ to produce ·O₂^-, but also catalyze H₂O₂ to ·OH. The results from this study offer evidence of new reaction pathways in Cu-activated O₂ systems and deepen understanding of the reaction between Cu species and O₂.

Keywords: Bisphenol A; Cu(0); Mechanism; O(2) activation.

MeSH terms

Benzhydryl Compounds / chemistry*
Copper / chemistry*
Electron Spin Resonance Spectroscopy
Hydrogen Peroxide
Oxidation-Reduction
Oxygen / chemistry*
Phenols / chemistry*
Reactive Oxygen Species / chemistry*
Reactive Oxygen Species / metabolism

Substances

Benzhydryl Compounds
Phenols
Reactive Oxygen Species
Copper
Hydrogen Peroxide
bisphenol A
Oxygen
cupric oxide