Incorporation of cobalt-manganese oxide into the hollow carbonic framework is a prospective way to synthesize eco-friendly and efficient catalyst/adsorbent for advanced oxidation processes and wastewater treatments. Nonetheless, the complex fabrication process remains a major issue hindering the practical application of carbon-based bimetallic oxide catalyst. Herein, a facile and general method is developed to fabricate novel cobalt manganese oxide embedded hollow activated carbon nanofibers (CoxMn3−xO4/HACNFs, x = 0,1,3) by using coaxial electrospinning technique and subsequent thermal treatment. Among the three CoxMn3−xO4/HACNFs, CoMn2O4/HACNFs exhibited the best catalytic activity in PMS activation and Rhodamine B (RhB) degradation, due to the synergistic effect between spinel oxide and hybridized carbon network. Furthermore, HACNFs significantly improved the durability of CoMn2O4 by preventing metal leaching during PMS activation. A marginal decrease in the performance of used CoMn2O4/HACNFs was observed during five cycles, but the performance could be recovered by a simple calcination. A rational PMS activation mechanism of CoMn2O4/HACNFs was proposed. Benefiting from the unique structural features, CoMn2O4/HACNFs exhibited a superior adsorption and catalytic performance for RhB removal under continuous-flow reaction.
Bibliographical noteFunding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and future Planning (NRF-2018R1A2A1A05020683).
© 2020 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering