MOFs-derived magnetic C@Cu–Ni bimetal particles: An efficient peroxymonosulfate activator for 2, 4, 6-trichlorophenol degradation. (April 2021)

• Record Type: Journal Article
• Authors: Zhang, Deyun; Li, Yunong; Guo, Jing; Zhou, Lixiang; Lan, Yeqing; Chen, Cheng
• Is Part Of: Chemosphere. Volume 269(2021)
• Publication Date: 2021-04
• Subjects: Magnetic C@Cu–Ni bimetal -- Peroxymonosulfate -- Activation -- Reactive oxygen species -- 2, 4, 6-Trichlorophenol degradation; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.129394
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: In this study, magnetic Cu and Ni bimetallic particles embedded carbon sheets, namely as C@Cu–Ni, was derived via calcining a mixture of Cu-MOFs and Ni-MOFs (mass ratio = 4:6) under N2 protection and served as a catalyst for the degradation of 2, 4, 6-trichlorophenol (2, 4, 6-TCP) by peroxymonosulfate (PMS). The results showed that more than 98.5% of 2, 4, 6-TCP (10 mg L −1 ) was rapidly decomposed at initial pH = 5, PMS = 1 mM and catalyst dosage = 0.1 g L −1 within 30 min, accompanied by 42.47% removal of total organic carbon (TOC). This fully confirmed that C@Cu–Ni possessed excellent catalytic performance for PMS activation. The radical quenching experiments and electron paramagnetic resonance (EPR) investigation testified that the reactive oxygen species (ROS) included SO4 −, OH, O2 − radicals and singlet oxygen ( 1 O2 ), which were responsible for the rapid degradation of 2, 4, 6-TCP. Among them, O2 − and 1 O2 played a decisive role. Cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) revealed that C@Cu–Ni material possessed superior electrical conductivity and electron transfer, improving its catalytic activity. What is more, C@Cu–Ni displayed excellent stability and could be consecutively used for five times without any decline of catalytic performance. The main intermediates of the 2, 4, 6-TCP degradation were analyzed by high-performance liquid chromatography-mass spectrometry (HPLC-MS/MS) and possible pathways of 2, 4, 6-TCP degradation were further proposed. The extraordinary stability and superior catalytic activity of C@Cu–Ni coupled with its easy separation from wastewater due to magnetism suggest that the newly synthesized material may offer a promising alternative approach to efficiently degrade organic pollutants by PMS. Graphical abstract: Image 1 Highlights: Magnetic C@Cu–Ni was obtained via calcining a mixture of Cu-MOFs and Ni-MOFs at mass ratio = 4:6. C@Cu–Ni possessed excellent catalytic performance for PMS activation. 98.5% of 2, 4, 6-TCP was degraded within 30 min, coupled by 42.47% removal of total organic carbon. The reactive oxygen species included SO4 −, OH, O2 − radicals and singlet oxygen ( 1 O2 ). C@Cu–Ni could be consecutively used for five times without any decline of catalytic activity.