Zinc-based metal–organic framework nanofibers membrane ZIF-65/PAN as efficient peroxymonosulfate activator to degrade aqueous ciprofloxacin

• Published in: Separation and purification technology Vol. 299; p. 121716
• Main Authors: Pu, Mengjie, Ye, Daqi, Wan, Jinquan, Xu, Bentuo, Sun, Wei, Li, Wei
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.10.2022
• Subjects: Ciprofloxacin; Electrospinning nanofibers membrane; Metal-organic framework; Peroxymonosulfate; ZIF-65/PAN; Electrospinning nanofibers membrane; Metal-organic framework; Peroxymonosulfate; ZIF-65/PAN; Ciprofloxacin
• ISSN: 1383-5866; 1873-3794
• DOI: 10.1016/j.seppur.2022.121716

[Display omitted] •Zn-ZIF-65/PAN ES membrane are firstly fabricated as PMS activators.•Zn-ZIF-65/PAN/PMS system showed high RSE when degrade CIP.•Zn-ZIF-65/PAN are renewable through layer-by-layer self-assembly.•SO4·−, ·OH, and 1O2 was generated to form radical and nonradical process.•CIP was degraded into eleven intermediates through mainly-three pathways. A novel peroxymonosulfate (PMS) catalyst, zinc-based metal–organic framework electrospinning (ES) nanofibers membrane (short for ZIF-65/PAN) was firstly fabricated and used for the degradation of aqueous ciprofloxacin (CIP). Physicochemical properties, catalytic performance, stability, reusability, and the regeneration of ZIF-65/PAN was observed and conducted. Influence of various parameters including ZIF-65 loading content, reaction temperature, initial pH, and competitive organic molecules on CIP degradation was investigated. Reactive active species and degradation intermediates that involved in ZIF-65/PAN/PMS/CIP process were identified. Corresponding reaction mechanisms were speculated. The results indicate that the easy-separation ZIF-65/PAN nanofibers exhibit high efficiency for PMS activation, 89.2 % of CIP was degraded within 60 min, with up to 87.5 % of PMS utilization efficiency. ZIF-65/PAN was renewable through simple layer-by-layer self-assembly, thus shows good prospect in future applications. 26.4 % of surface Zn2+ of ZIF-65/PAN exists in the form of + III oxidation state after activation, indicating the role of zinc catalytic site. Through activation, oxidative active species SO4·−, ·OH, and 1O2 was generated, CIP was thus degraded through mainly-three pathways. This study provides novel ideas for the application of MOF-based membrane on PMS based advanced oxidation processes.