OICC Press Journal of Nanostructure in Chemistry 2193-8865 14 2 2022 06 01 Nanoscale CoNi alloy@carbon derived from Hofmann-MOF as a magnetic/effective activator for monopersulfate to eliminate an ultraviolet filter 10.1007/s40097-022-00499-w EN Wei-Jie Liu Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung, TW Eilhann Kwon Department of Earth Resources and Environmental Engineering, Hanyang University, Seoul, KR Bui Xuan Thanh Faculty of Environment and Natural Resources, Ho Chi Minh City University of Technology, Ho Chi Minh City, 700000, VN Jechan Lee School of Civil, Architectural Engineering, and Landscape Architecture, Sungkyunkwan University, Suwon, 16419, KR Cong Khiem Ta Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung, TW Sanya Sirivithayapakorn Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok, TH Kun-Yi Andrew Lin Department of Environmental Engineering & Innovation and Development Center of Sustainable Agriculture, National Chung Hsing University, Taichung, TW Journal Article 2022 06 01 Abstract As the widely used ultraviolet (UV) filter, Ensulizole (ELZ), has been proven as an environmental hormone, development of useful techniques for eliminating ELZ is imperative. Since SO 4 ·− -based oxidation technologies are promising for treating emerging contaminants, and cobalt (Co) appears to be an extremely useful catalyst for monopersulfate (MPS) activation, that would be critical to construct advantageous cobaltic catalyst of MPS activation. A unique activator would be derived from a special metal organic framework ([Co]pyrazine[Ni(CN) 4 ]) which is carbonized to become a nanocluster comprised of CoNi alloy nanoparticles (NPs) confined in carbon nanospheres, and nanotubes, forming CoNi@Carbon (CNC). Such a CNC nanocomposite would exhibit several promising properties: (1) as Co is the extremely effective metal for MPS activation, CoNi is expected for offering superior performance for activating MPS; (2) high magnetization of CoNi alloy would equip CNC with a magnetically-controllability; (3) CoNi encapsulated in carbon is guarded to enhance its reusability; (4) the interlaced configurations of CNC also make it to show higher active sites for MPS activation. Thus, CNC exhibits a significantly stronger activating capability than Co 3 O 4 , which is the conventional heterogeneous catalyst for MPS. CNC/MPS also displays a lower activation energy (E a ) for ELZ degradation than literatures, showing advantages of CNC. Mechanisms for MPS activation and ELZ degradation were also elucidated to further understand elimination process of ELZ by MOF-derived cobaltic catalysts.