Degradation of nonylphenol ethoxylate 10 in biochar-CoFe2O4/peroxymonosulfate system: Transformation products identification, catalysis mechanism and influencing factors. Issue 1 (February 2023)

• Record Type: Journal Article
• Authors: Song, Junying; Wang, Yaqi; Lv, Zhiwen; Li, Yuqing; Cao, Xiao-qiang; Cheng, Weimin
• Is Part Of: Journal of environmental chemical engineering. Volume 11:Issue 1(2023)
• Publication Date: 2023-02
• Subjects: Biochar -- CoFe2O4 -- Nonylphenol ethoxylate 10 -- Peroxymonosulfate -- Catalyst; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2022.109241
• Languages: English
• ISSNs: 2213-2929

Abstract

Abstract: Nonylphenol ethoxylate 10 (NPEO10 ) is an endocrine disrupting chemical, which can interfere with human endocrine secretion and is carcinogenic and teratogenic to humans. In this study, a peanut shell-based biochar-CoFe2 O4 (Bio-CoFe2 O4 ) catalyst with thin layer of fine CoFe2 O4 nanoparticles on biochar surface was synthesized using a facile hydrothermal method. For the first time, the degradation of NPEO10 in Bio-CoFe2 O4 /peroxymonosulfate (PMS) system was studied. Bio-CoFe2 O4 composite showed much higher removal efficiency (90.6%) and larger reaction rate constant (k = 0.059 min −1 ) than that of biochar or CoFe2 O4 in presence of PMS (catalyst dosage, 1.5 g/L, PMS dosage, 1.5 mM, NPEO10 concentration, 20 mg/L, and initial pH, 7.0). The significantly enhanced catalytic performance was mainly ascribed to the more exposed reaction active sites induced by its well-dispersed CoFe2 O4 with smaller grain size. The quenching experiments and EPR analysis revealed that radical (including SO4 - and OH and O2 - radicals) and non-radical (i.e. 1 O2 ) pathways worked together for the NPEO10 degradation, and the OH was the major contributor. Besides, the stable redox cycle of Co(III)/Co(II) and Fe(III)/Fe(II), the graphitized structure and CO in Bio-CoFe2 O4 composite were closely related with the activation of PMS to continuously generate these reactive species, thereby efficiently removing NPEO10 . Furthermore, the possible transformation products, degradation pathways and catalytic mechanisms of NPEO10 were identified and proposed in detail. Overall, our study provides a potential way to activate PMS for the effective removal of complex organic pollutants from wastewater. Graphical Abstract: The peanut shell-based biochar-CoFe2 O4 catalyst with more exposed reaction active sites induced by the thin layer of fine CoFe2 O4 nanoparticles on biochar surface exhibited greatly enhanced catalytic degradation performance for nonylphenol ethoxylate 10. This study provides a promising strategy to prepare the hybrid catalyst for wastewater with complex organic pollutants remediation based on the sulfate-based technology. ga1 Highlights: Biochar-CoFe2 O4 as PMS catalyst effectively removed NPEO10 (90.6%) from wastewater. The contribution order for NPEO10 degradation was OH > 1 O2 > SO4 - > O2 - . The rich functional groups and special structure caused the superior performance. The degradation pathways and catalytic mechanisms of NPEO10 were proposed.