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• W4309576649 endingPage "140474" @default.
• W4309576649 startingPage "140474" @default.
• W4309576649 abstract "• Vacancies-rich bimetallic MOFs precursor was prepared via coprecipitation method. • MOFs derived bifunctional CoFe-N-CNTs was successfully fabricated and optimized. • p -ASA was efficiently degraded by CoFe-N-CNTs activated PMS. • The generated inorganic arsenic was simultaneously adsorbed on CoFe-N-CNTs. • 1 O 2 , SO 4 •- , • OH, and O 2 •- were involved in CoFe-N-CNTs/PMS system. The rational design of high-performance catalysts with peroxymonosulfate (PMS) activation and arsenic adsorption capacities for the removal of p -arsanilic acid ( p -ASA) is in high demand but remains a significant challenge. Herein, vacancies-rich metal-organic frameworks (MOFs) were constructed by room-temperature co-precipitation procedure, and magnetic CoFe encapsulated in N-doped carbon nanotubes (CoFe-N-CNTs) were prepared using MOFs template by an annealing process under a nitrogen atmosphere. The synthesis conditions of CoFe-N-CNTs were optimized by tuning Fe/Co ratio and carbonization temperature. The CoFe-N-CNTs/PMS system showed favorable removal performance, achieving complete degradation of 46 μM p -ASA within 3 min and a total arsenic removal efficiency of 98% within 30 min at 0.1 g/L catalyst and 400 μM PMS. The degradation rate ( k obs ) and total arsenic removal efficiency towards p -ASA was 6.7 and 2.7 times of those of catalyst derived from MOFs without vacancies, respectively. CoFe-N-CNTs/PMS system exhibited robust and efficient performance over a broad range of pH 4.5-9.0 and in different water matrices. Scavenging experiments and electron paramagnetic resonance (EPR) results demonstrated that non-radical singlet oxygen ( 1 O 2 ), sulfate radicals (SO 4 •- ), hydroxyl radicals ( • OH), and superoxide (O 2 •- ) were involved in p -ASA decomposition. Electron transfer and direct oxidative transfer process (DOTP) also contributed to p -ASA degradation. High-performance liquid chromatography coupled with inductively coupled plasma mass spectrometry (HPLC-ICP-MS) analysis indicated that the arsenic moiety was cleaved from p -ASA in the form of As(III) and then rapidly oxidized to As(V). X-ray photoelectron spectroscopy (XPS) analysis indicated the removal of inorganic arsenic followed the mechanism of the inner-sphere complex. This study highlights the in-situ synthesis of CoFe-N-CNTs with outstanding activities for catalytic degradation and arsenic removal of organoarsenicals." @default.
• W4309576649 created "2022-11-28" @default.
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• W4309576649 date "2023-02-01" @default.
• W4309576649 modified "2023-10-05" @default.
• W4309576649 title "Vacancies-rich MOFs-derived magnetic CoFe encapsulated in N-doped carbon nanotubes as peroxymonosulfate activator for p-arsanilic acid removal" @default.
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• W4309576649 doi "https://doi.org/10.1016/j.cej.2022.140474" @default.
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