Ultrathin CoO@NC nanosheets derived from NaBH4-treated ZIF-67 for ofloxacin degradation
Yifang Zhao, Lian Wu, Peiping Hong, Xin He, Shuxi Gao, Yue Yu, Bing Liao, Hao Pang
Abstract
Modulating the morphology of precursor can effectively adjust the property of derived composite. Herein, after post-treated by NaBH 4 , a layered ZIF-67 precursor was endowed with high porosities, partially delaminated and curled layers. With this material as precursor, the pyrolysis composite, P-CoO@NC, exhibits a morphology of ultrathin N-doped carbon (NC) nanosheets coupled with highly dispersed CoO nanoparticles. This composite can active peroxymonosulfate (PMS) and degrade ofloxacin (OFL) with an efficiency of 96.8 % (10 min). After recycling for five times, the degradation efficiency can still reach 82.5 %, which demonstrates its catalytic activity and stability as an advance oxidation process (AOP) catalyst. As confirmed by related experiments, both radical (SO 4 — and O 2 — ) and non-radical ( 1 O 2 ) pathways take part in OFL degradation in P-CoO@NC system. Overall, this work demonstrates a specific role of NaBH 4 in modulating MOF precursor and further the property of derived composite.