Ultrathin CoO@NC nanosheets derived from NaBH4-treated ZIF-67 for ofloxacin degradation

复合数 降级(电信) 催化作用 热解 化学工程 形态学(生物学) 氧氟沙星 材料科学 纳米颗粒 碳纤维 化学 纳米技术 复合材料 有机化学 工程类 生物 电信 生物化学 抗生素 遗传学 环丙沙星 计算机科学
作者
Yifang Zhao,Lian Wu,Peiping Hong,Xin He,Shuxi Gao,Yue Yu,Bing Liao,Hao Pang
出处
期刊:Applied Surface Science [Elsevier BV]
卷期号:645: 158864-158864 被引量:14
标识
DOI:10.1016/j.apsusc.2023.158864
摘要

An ultrathin CoO@NC nanosheet is prepared with NaBH4-treated ZIF-67 and can degrade ofloxacin rapidly and effectively as an AOP catalyst. • After treated by NaBH4, ZIF-67 is partially delaminated and curled. • The derived CoO@NC exhibits an ultrathin carbon nanosheet loaded with highly dispersed CoO NPs. • The CoO@NC can decompose ofloxacin via both radical and non-radical pathways. • A high ofloxacin removal efficiency (96.8 %) is achieved by P-CoO@NC after reacting for 10 min. • Four ofloxacin degradation pathways are proposed. 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.
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