Mn2O3/Mn3O4-Cu1.5Mn1.5O4 spinel as an efficient Fenton-like catalyst activating persulfate for the degradation of bisphenol A: Superoxide radicals dominate the reaction

Yihong Zhu; Zijing Sun; Yun Deng; Fudong Liu; Wenquan Ruan; Lijuan Xie

doi:10.1016/j.scitotenv.2022.156075

Mn₂O₃/Mn₃O₄-Cu_1.5Mn_1.5O₄ spinel as an efficient Fenton-like catalyst activating persulfate for the degradation of bisphenol A: Superoxide radicals dominate the reaction

Sci Total Environ. 2022 Sep 15:839:156075. doi: 10.1016/j.scitotenv.2022.156075. Epub 2022 May 20.

Authors

Yihong Zhu¹, Zijing Sun¹, Yun Deng², Fudong Liu³, Wenquan Ruan⁴, Lijuan Xie⁵

Affiliations

¹ School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China.
² School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China. Electronic address: dengyun@jiangnan.edu.cn.
³ Department of Civil, Environmental, and Construction Engineering, Catalysis Cluster for Renewable Energy and Chemical Transformations (REACT), NanoScience Technology Center (NSTC), University of Central Florida, Orlando, FL 32816, United States. Electronic address: fudong.liu@ucf.edu.
⁴ School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Engineering Laboratory of Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi 214122, China.
⁵ School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China; Jiangsu Engineering Laboratory of Biomass Energy and Carbon Reduction Technology, Jiangnan University, Wuxi 214122, China. Electronic address: ljxie@jiangnan.edu.cn.

PMID: 35598663
DOI: 10.1016/j.scitotenv.2022.156075

Abstract

In this work, a Mn₂O₃/Mn₃O₄-Cu_1.5Mn_1.5O₄ spinel was fabricated and utilised as a catalyst to activate peroxydisulfate (PDS) leading to degradation of bisphenol A (BPA). The results showed that the system exhibited an excellent turnover frequency (TOF) of 2.7 × 10^-3 s^-1 and high stability. The amount of ion leaching was small and the degree of mineralisation was up to 66.2%. Superoxide radicals (O₂^-) were determined to be the dominant active species in the system. ≡Mn(II) and oxygen vacancies (V_o) were found to be the main active sites at the catalyst surface. The activation of PDS by the spinel catalyst and the reduction of dissolved oxygen both contributed to the production of O₂^- species. The synergistic effect of ≡Cu(I)/≡Cu(II) and ≡Mn(II)/≡Mn(III) redox pairs enabled the reaction to occur continuously. These results suggest the promise of this novel spinel catalyst in the removal of refractory organic compounds due to its excellent performance and stability. The catalyst may thus have great utility for environmental remediation.

Keywords: Bisphenol A; Cu(x)Mn(3-x)O(4) spinel; Dissolved oxygen; Peroxydisulfate activation; Superoxide radical.

MeSH terms

Aluminum Oxide
Benzhydryl Compounds* / chemistry
Magnesium Oxide
Oxygen
Phenols
Superoxides*

Substances

Benzhydryl Compounds
Phenols
spinell
Superoxides
Magnesium Oxide
Aluminum Oxide
bisphenol A
Oxygen