Two-dimensional manganese-iron bimetallic MOF-74 for electro-Fenton degradation of sulfamethoxazole

Danhui Wu; Tao Hua; Shuaipeng Han; Xiuquan Lan; Jianhua Cheng; Weiqiu Wen; Yongyou Hu

doi:10.1016/j.chemosphere.2023.138514

Two-dimensional manganese-iron bimetallic MOF-74 for electro-Fenton degradation of sulfamethoxazole

Chemosphere. 2023 Jun:327:138514. doi: 10.1016/j.chemosphere.2023.138514. Epub 2023 Mar 25.

Authors

Danhui Wu¹, Tao Hua¹, Shuaipeng Han¹, Xiuquan Lan¹, Jianhua Cheng², Weiqiu Wen³, Yongyou Hu¹

Affiliations

¹ Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
² Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; South China Institute of Collaborative Innovation, Dongguan 523808, China. Electronic address: jhcheng@scut.edu.cn.
³ Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, College of Environment and Energy, South China University of Technology, Guangzhou, 510006, China; South China Institute of Collaborative Innovation, Dongguan 523808, China. Electronic address: willwen20219120@scut.edu.cn.

PMID: 36972871
DOI: 10.1016/j.chemosphere.2023.138514

Abstract

This study reported a novel application of Mn_0.67Fe_0.33-MOF-74 with two-dimensional (2D) morphology grown on carbon felt as a cathode for efficiently removing antibiotic sulfamethoxazole in the heterogeneous electro-Fenton system. Characterization demonstrated the successful synthesis of bimetallic MOF-74 by a simple one-step method. Electrochemical detection showed that the second metal addition and morphological change improved the electrochemical activity of the electrode and contributed to pollutant degradation. At pH 3 and 30 mA of current, the degradation efficiency of SMX reached 96% with 12.09 mg L^-1 H₂O₂ and 0.21 mM ·OH detected in the system after 90 min. During the reaction, electron transfer between ≡Fe^II/III and ≡Mn^II/III promoted divalent metal ions regeneration, which ensured the continuation of the Fenton reaction. Two-dimensional structures exposed more active sites favoring ·OH production. The pathway of sulfamethoxazole degradation and the reaction mechanisms were proposed based on the intermediates identification by LC-MS and radical capture results. High degradation rates were still observed in tap and river water, revealing the potential of Mn_0.67Fe_0.33-MOF-74@CF for practical applications. This study provides a simple MOF-based cathode synthesis method, which enhances our understanding of constructing efficient electrocatalytic cathodes based on morphological design and multi-metal strategies.

Keywords: Heterogeneous electro-Fenton; MOF-74; Oxygen reduction reaction; Sulfamethoxazole; Two-dimensional nanosheets.

MeSH terms

Electrodes
Hydrogen Peroxide / chemistry
Iron / chemistry
Manganese
Oxidation-Reduction
Sulfamethoxazole*
Water Pollutants, Chemical* / analysis

Substances

Sulfamethoxazole
Manganese
Iron
Hydrogen Peroxide
Water Pollutants, Chemical