MOF-derived magnetically recoverable Z-scheme ZnFe2O4/Fe2O3 perforated nanotube for efficient photocatalytic ciprofloxacin removal

光催化 降级(电信) 纳米管 煅烧 纳米棒 化学工程 化学 光化学 材料科学 纳米技术 催化作用 碳纳米管 有机化学 计算机科学 电信 工程类
作者
Xiaohan Zhang,Biyun Lin,Xinyi Li,Xin Wang,Kaizhou Huang,Zhihong Chen
出处
期刊:Chemical Engineering Journal [Elsevier BV]
卷期号:430: 132728-132728 被引量:65
标识
DOI:10.1016/j.cej.2021.132728
摘要

Constructing advanced direct Z-scheme photocatalysts is an effective strategy to enhance photogenerated charge separation for photocatalytic removal of organic pollutants but faces challenges in efficient morphology control and recovery method. Herein, a novel magnetically recoverable Z-scheme ZnFe2O4/Fe2O3 perforated nanotube was successfully prepared by one-step MOF-derived calcination method by using MIL-88B/Zn core/shell nanorod as precursor for the first time. In the calcination process, MIL-88B core reacted with oxygen to form hollow Fe2O3 and Zn2+ shell underwent an in situ solid-state reaction with Fe2O3 to cause volume shrinkage and formation of ZnFe2O4, and finally turned into intimate ZnFe2O4/Fe2O3 perforated nanotube (ZFF). Because of such exquisitely perforated nanotube and Z-scheme transfer pathway, ZFF shows superior light absorption, bulk-phase and interfacial separation of photogenerated charge, and thus lead to prominent photocatalytic performance for ciprofloxacin (CIP) removal. Especially, ZFF-2 exhibits the best photocatalytic CIP degradation performance with a degradation percentage of 96.5% and a TOC removal percentage up to 89% under light irradiation for 180 min. Moreover, ZFF show sufficient photo-stability and re-usability for photocatalytic degradation of CIP by a convenient magnetic recovery method. The electron spin resonance experiments, radical trapping and fluorescence experiments reveal that the photogenerated charge pathways of ZFF photocatalysts is a Z-scheme mechanism and the major active species for degradation of CIP are •O2– and •OH. This work offers a new perspective on construction of high-efficient direct Z-scheme photocatalysts with convenient recovery and deep insight on pollutants purification mechanism.
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