title: Topotactic Transformation of Metal-Organic Frameworks to Graphene-Encapsulated Transition-Metal Nitrides as Efficient Fenton-like Catalysts.
abstract: Innovation in transition-metal nitride (TMN) preparation is highly desired for realization of various functionalities. Herein, series of graphene-encapsulated TMNs (FexMn6-xCo4-N@C) with well-controlled morphology have been synthesized through topotactic transformation of metal-organic frameworks in an N2atmosphere. The as-synthesized FexMn6-xCo4-N@C nanodices were systematically characterized and functionalized as Fenton-like catalysts for catalytic bisphenol A (BPA) oxidation by activation of peroxymonosulfate (PMS). The catalytic performance of FexMn6-xCo4-N@C was found to be largely enhanced with increasing Mn content. Theoretical calculations illustrated that the dramatically reduced adsorption energy and facilitated electron transfer for PMS activation catalyzed by Mn4N are the main factors for the excellent activity. Both sulfate and hydroxyl radicals were identified during the PMS activation, and the BPA degradation pathway mainly through hydroxylation, oxidation, and decarboxylation was investigated. Based on the systematic characterization of the catalyst before and after the reaction, the overall PMS activation mechanism over FexMn6-xCo4-N@C was proposed. This study details the insights into versatile TMNs for sustainable remediation by activation of PMS.
authors.affiliation: Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.|University of Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Xuning
authors.initials: X
authors.lastname: Li
authors.affiliation: Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology , Guangzhou, 510006, China.
authors.forename: Zhimin
authors.initials: Z
authors.lastname: Ao
authors.affiliation: Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.|University of Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Jiayi
authors.initials: J
authors.lastname: Liu
authors.affiliation: School of Engineering, Edith Cowan University , Joondalup, Western Australia 6027, Australia.
authors.forename: Hongqi
authors.identifier: 0000-0003-0907-5626
authors.initials: H
authors.lastname: Sun
authors.affiliation: Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.
authors.forename: Alexandre I
authors.initials: AI
authors.lastname: Rykov
authors.affiliation: Mössbauer Effect Data Center, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.
authors.forename: Junhu
authors.identifier: 0000-0003-1987-2522
authors.initials: J
authors.lastname: Wang
keywords: DFT calculation; Mn4N; activation mechanism; graphene encapsulated; sulfate radicals