A novel 3-dimensional graphene-based cobalt-manganese bimetallic layered double hydroxide:Formation mechanism and performance in photo-assisted permonosulfate-activated degradation of sulfamethoxazole in aqueous solution

Zhibo Liu; Xiaoyue Duan; Ajit K Sarmah; Xuesong Zhao; Xin Ren; Bo Sun

doi:10.1016/j.envpol.2023.122397

A novel 3-dimensional graphene-based cobalt-manganese bimetallic layered double hydroxide:Formation mechanism and performance in photo-assisted permonosulfate-activated degradation of sulfamethoxazole in aqueous solution

Environ Pollut. 2023 Nov 1:336:122397. doi: 10.1016/j.envpol.2023.122397. Epub 2023 Aug 17.

Authors

Zhibo Liu¹, Xiaoyue Duan², Ajit K Sarmah³, Xuesong Zhao⁴, Xin Ren⁵, Bo Sun⁶

Affiliations

¹ College of Environmental Science and Engineering, Jilin Normal University, Haifeng Street, Tiexi Dist, Siping, 136000, China.
² Key Laboratory of Environmental Materials and Pollution Control, Education Department of Jilin Province, Siping, 136000, China.
³ The Department of Civil & Environmental Engineering, Faculty of Engineering, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
⁴ College of Environmental Science and Engineering, Jilin Normal University, Haifeng Street, Tiexi Dist, Siping, 136000, China; Key Laboratory of Environmental Materials and Pollution Control, Education Department of Jilin Province, Siping, 136000, China. Electronic address: zhaoxuesong@jlnu.edu.cn.
⁵ College of Environmental Science and Engineering, Jilin Normal University, Haifeng Street, Tiexi Dist, Siping, 136000, China; Key Laboratory of Environmental Materials and Pollution Control, Education Department of Jilin Province, Siping, 136000, China.
⁶ National & Local Joint Engineering Research Center for Ecological Treatment Technology of Urban Water Pollution, School of Life and Environmental Science, Wenzhou University, Wenzhou, China.

PMID: 37597732
DOI: 10.1016/j.envpol.2023.122397

Abstract

Sulfamethoxazole (SMX) is a common antibiotic used mainly for bacterial treatment. In this study, a novel three-dimensional cobalt-manganese bimetallic layered double hydroxide graphene hydrogel (CoMn-LDHs/rGO) has been prepared for photo-assisted permonosulfate (PMS)-activated degradation of SMX in water. Compared with the CoMn-LDHs/rGO + PMS and CoMn-LDHs/rGO + Vis systems, the degradation effect of CoMn-LDHs/rGO + PMS + Vis system is the best, and the degradation effect of CoMn-LDHs/rGO system could reach more than 98% under the optimal conditions. After 10 cycles, the catalytic degradation performance of CoMn-LDHs/rGO system remained good, while effectively preventing the leaching of metal ions. Based on the synergistic effect of photocatalysis and PMS oxidation, electron spin resonance spectroscopy and quenching experiments showed that three active substances (•OH, •SO₄^- and O₂^•-) were involved in the degradation of SMX. Density functional theory and liquid chromatography-mass spectrometry (LC-MS) results further proposed the SMX degradation transformation calculation. As expected, the study of the reaction mechanism of 3D CoMn-LDHs/rGO assisted PMS activation under visible light provides an efficient and rapid method for the sustainable degradation of pollutants in water system.

Keywords: Bimetallic layered double hydroxide; Permonosulfate; Reaction mechanism; Sulfamethoxazole; Visible light.