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

doi:10.1016/j.jmst.2022.10.079

Abstract

Abstract: Carbon nanofibers with hollow structures have an excellent application prospect in various fields because 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 peroxymonosulfate (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 magnetic and recoverable easily due to the addition of Co/CoO. Two pathways of both radical (SO₄^•-) and non-radical (¹O₂) 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 oxidation processes in the future.

Key words: Electrospinning, Hollow fiber, Co/coO, Radical and non-radical, Rhodamine B

Zhende Li, Xiaoyan Zhang, Guangzhen Li, Fengjin Han, Dongqi Hu, Xiaoyu Huang, Hua Yuan, Yeqiang Tan. Hollow Co/CoO/Carbon nanofibers promoted PMS decomposition for the degradation of Rhodamine B[J]. J. Mater. Sci. Technol., 2023, 157: 120-129.

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