Degradation of sulfamethoxazole by cobalt-nickel powder composite catalyst coupled with peroxymonosulfate: Performance, degradation pathways and mechanistic consideration

Fan Liu; Hongyu Zhou; Zhicheng Pan; Yang Liu; Gang Yao; Yong Guo; Bo Lai

doi:10.1016/j.jhazmat.2020.123322

Degradation of sulfamethoxazole by cobalt-nickel powder composite catalyst coupled with peroxymonosulfate: Performance, degradation pathways and mechanistic consideration

J Hazard Mater. 2020 Dec 5:400:123322. doi: 10.1016/j.jhazmat.2020.123322. Epub 2020 Jun 26.

Authors

Fan Liu¹, Hongyu Zhou¹, Zhicheng Pan², Yang Liu³, Gang Yao⁴, Yong Guo⁵, Bo Lai⁶

Affiliations

¹ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu, 610065, China.
² Laboratory of Wastewater Treatment Technology in Sichuan Province, Haitian Water Group, China.
³ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu, 610065, China. Electronic address: [email protected].
⁴ Sino-German Centre for Water and Health Research, Sichuan University, Chengdu, 610065, China; Institute of Environmental Engineering, RWTH Aachen University, Germany.
⁵ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China.
⁶ State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu, 610065, China; Sino-German Centre for Water and Health Research, Sichuan University, Chengdu, 610065, China. Electronic address: [email protected].

PMID: 32947719
DOI: 10.1016/j.jhazmat.2020.123322

Abstract

In this work, cobalt-nickel powder (Co-NP) synthesized through electroless plating was used as a heterogeneous bimetallic catalyst for peroxymonosulfate (PMS) activation to degrade sulfamethoxazole (SMX) in the aqueous phase. Compared with different oxidation systems and different catalysts, it was proved that Co-NP had excellent catalytic ability, fast electron transfer rate and good stability. The effects of key parameters (initial pH, SMX concentration, catalyst and PMS dosages) on SMX degradation and ion leaching were studied in detail. Furthermore, the sensitivity of inorganic anions and different pollutants towards the Co-NP/PMS system was studied to investigate its application in natural water bodies. Quenching test showed that the main reactive oxygen species generated during the reaction were OH and SO₄^-, of which SO₄^- played a predominating role. Combined with XPS analysis, the activation mechanism was concluded that free radicals were mainly generated through the valence change of Co and Ni. Based on the seven intermediates measured through ultrahigh performance liquid chromatograph-mass spectrometry (UPLC-QTOF-MS/MS), the possible degradation pathways of SMX were proposed. Notably, this study provided a new kind of supporter for advanced oxidation processes and electroless plating technology.

Keywords: Cobalt-nickel powder; Mechanism; Peroxymonosulfate; Sulfamethoxazole.

Publication types

Research Support, Non-U.S. Gov't