Efficient treatment of actual glyphosate wastewater via non-radical Fenton-like oxidation

Lei Jin; Yingping Huang; Honglin Liu; Liqun Ye; Xiang Liu; Di Huang

doi:10.1016/j.jhazmat.2023.132904

Efficient treatment of actual glyphosate wastewater via non-radical Fenton-like oxidation

J Hazard Mater. 2024 Feb 5:463:132904. doi: 10.1016/j.jhazmat.2023.132904. Epub 2023 Oct 31.

Authors

Lei Jin¹, Yingping Huang¹, Honglin Liu¹, Liqun Ye¹, Xiang Liu², Di Huang³

Affiliations

¹ Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region of Ministry of Education, College of Hydraulic & Environmental Engineering, College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China.
² Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region of Ministry of Education, College of Hydraulic & Environmental Engineering, College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China. Electronic address: xiang.liu@ctgu.edu.cn.
³ Engineering Research Center of Eco-Environment in Three Gorges Reservoir Region of Ministry of Education, College of Hydraulic & Environmental Engineering, College of Materials and Chemical Engineering, China Three Gorges University, Yichang, Hubei 443002, China. Electronic address: huangd94@iccas.ac.cn.

PMID: 37924705
DOI: 10.1016/j.jhazmat.2023.132904

Abstract

Compared to radical oxidative pathway, recent research revealed that non-radical oxidative pathway has higher selectivity, higher adaptability and lower oxidant requirement. In this work, we have designed and synthesized Cu₂O/Cu nanowires (CuNWs), by pyrolysis of copper chloride and urea, to selectively generate high-valent copper (Cu^III) upon H₂O₂ activation for the efficient treatment of actual glyphosate wastewater. The detailed characterizations confirmed that CuNWs nanocomposite was comprised of Cu⁰ and Cu₂O, which possessed a nanowire-shaped structure. The electron paramagnetic resonance (EPR) analysis, in situ Raman spectra, chronoamperometry and liner sweep voltammetry (LSV) verified Cu^III, which mainly contributed to glyphosate degradation, was selectively generated from CuNWs/H₂O₂ system. In particular, Cu^I is mainly oxidized by H₂O₂ into Cu^IIIvia dual-electron transfer, rather than simultaneously releasing OH• via single electron transfer. More importantly, CuNWs/H₂O₂ system exhibited the excellent potential in the efficient treatment of actual glyphosate wastewater, with 96.6% degradation efficiency and chemical oxygen demand (COD) dropped by 30%. This novel knowledge gained in the work helps to apply CuNWs into heterogeneous Fenton-like reaction for environmental remediation and gives new insights into non-radical pathway in H₂O₂ activation.

Keywords: Cu(III); Fenton reaction; Glyphosate; Non-radical pathway; Wastewater treatment.