Persulfate enhanced removal of bisphenol A by copper oxide/reduced graphene oxide foam: Influencing factors, mechanism and degradation pathway

Qinwen Zhou; Lijun Luo; Lihong Xia; Canhu Cha; Fengzhi Jiang; Hongbin Wang; Jianhui Dai; Li Shu

doi:10.1016/j.chemosphere.2023.139786

Persulfate enhanced removal of bisphenol A by copper oxide/reduced graphene oxide foam: Influencing factors, mechanism and degradation pathway

Chemosphere. 2023 Nov:340:139786. doi: 10.1016/j.chemosphere.2023.139786. Epub 2023 Aug 11.

Authors

Qinwen Zhou¹, Lijun Luo², Lihong Xia¹, Canhu Cha¹, Fengzhi Jiang³, Hongbin Wang¹, Jianhui Dai¹, Li Shu⁴

Affiliations

¹ Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, China.
² Key Laboratory of Environmental Functional Materials of Yunnan Province Education Department, School of Chemistry and Environment, Yunnan Minzu University, Kunming, 650500, China. Electronic address: luolijun@ynni.edu.cn.
³ Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan University, Kunming, 650091, China.
⁴ School of Engineering, Edith Cowan University, 70 Joondalup Drive, Joondalup, Perth, WA, 6027, Australia.

PMID: 37574092
DOI: 10.1016/j.chemosphere.2023.139786

Abstract

The CuO/reduced graphene oxide foam (CuO/RGF) with excellent recyclability was prepared via hydrothermal method followed by freeze drying treatment for bisphenol A (BPA) removal via activating peroxydisulfate (PDS). SEM, XRD, XPS, FT-IR, BET, and TG techniques were used to investigate the structure and property of CuO/RGF. The effect of degradation conditions (pH, PDS amount, Cl^-, HCO₃^-, HA and FA) on BPA removal by CuO/RGF were investigated. The result presented that CuO nanosheet was inserted into the RGF carrier with three-dimensional structure. The degradation rate constant of BPA over CuO/RGF (0.00917 min^-1) was 1.24 and 6.46 times higher than those of BPA over CuO (0.00714 min^-1) and RGF (0.00142 min^-1). More importantly, the pore structure of RGF can successfully limit the release of Cu (II) compared to pure CuO. According to quenching test as well as electron spin resonance (EPR) spectra, BPA degradation was triggered by ¹O₂, ^•OH and SO₄^•-, which was the combination of nonradical (¹O₂) and radical activation of PDS (^•OH and SO₄^•-). The possible degradation route of BPA was proposed based on intermediates obtained by combining solid phase extraction pretreatment technique with high performance liquid-mass spectrometry. After assessing the viability of MCF-7 cells, we can see that the estrogenic activities of treated solution reduced without producing stronger endocrine disruptors.

Keywords: Adsorption; Bisphenol A; Copper oxide; Persulfate activation; Reduced graphene foam.

MeSH terms

Copper* / chemistry
Oxidation-Reduction
Oxides*
Spectroscopy, Fourier Transform Infrared

Substances

cupric oxide
cuprous oxide
Copper
bisphenol A
graphene oxide
Oxides