Hollow Co/CoO/Carbon nanofibers promoted PMS decomposition for the degradation of Rhodamine B

摘要

Carbon nanofibers with hollow structures have an excellent application prospect in various fields be-cause of their high specific surface area and abundant active sites.PAN-based hollow carbon nanofiber doped with Co/CoO(H-Co/CoO-CNF)was successfully prepared and used as a catalyst to activate perox-ymonosulfate(PMS)and degrade Rhodamine B(RhB).The catalyst showed a surprising degradation rate(98.89%)of RhB within 15 min and had good degradation performance in a wide pH range(pH 1.5-11.2).Compared with solid fibers,H-Co/CoO-CNF shows better cyclic characteristics.The catalyst is also mag-netic and recoverable easily due to the addition of Co/CoO.Two pathways of both radical(SO_(4)·^(−))and non-radical(^(1)O_(2))exist during the RhB degradation process are confirmed through electron paramagnetic resonance(EPR)analysis and radical quenching experiments.This work provides a new idea for hollow fibers loaded with metals and their oxides and can guide the development of catalysts for advanced oxi-dation processes in the future.