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MOFs-derived magnetic [email protected] bimetal particles: An efficient peroxymonosulfate activator for 2,4,6-trichlorophenol degradation

Highlights•Magnetic [email protected] was obtained via calcining a mixture of Cu-MOFs and Ni-MOFs at mass ratio=4:6.•[email protected] 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 (1O2).•[email protected] could be consecutively used for five times without any decline of catalytic activity.AbstractIn this study, magnetic Cu and Ni bimetallic particles embedded carbon sheets, namely as [email protected], 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 [email protected] 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 (1O2), which were responsible for the rapid degradation of 2,4,6-TCP. Among them, O2−and 1O2 played a decisive role. Cyclic voltammograms (CV) and electrochemical impedance spectroscopy (EIS) revealed that [email protected] material possessed superior electrical conductivity and electron transfer, improving its catalytic activity. What is more, [email protected] 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 spectro-metry (HPLC-MS/MS) and possible pathways of 2,4,6-TCP degradation were further proposed. The extraordinary stability and superior catalytic activity of [email protected] coupled with its easy separation from wastewater due to magnetic suggest that the newly synthesized material may offer a promising alternative approach to efficiently degrade organic pollutants by PMS.Graphical abstractDownload : Download high-res image (144KB)Download : Download full-size image


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