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

Sulfate Radical-Based Degradation of Organic Pollutants: A Review on Application of Metal-Organic Frameworks as Catalysts

“…A zinc-based ZIF and polyacrylonitrile composite electrospun fibrous membrane (Zn-ZIF-65/PAN) as a PMS activator showed 89.2% (60 min) ciprofloxacin degradation and 55% degradation in five recycling tests. Retreatment of the ZIF/PAN catalyst enhanced the catalytic performance, indicating the renewable property of the catalyst toward PMS . In a recent study, when CoAl 2 O 4 @γ-Al 2 O 3 derived from ZIF-67 was used for PMS activation, it was observed that with every successive cycle the degradation efficiency decreased.…”

“…and imidazole derivatives and are topologically structured zeolites . The properties through which the catalytic activity is enhanced are surface sensitivity, large surface area, large pore size, and thermal stability, among others. − Furthermore, the unique structural properties of ZIF-MOFs allow for a high degree of control over the catalytic performance, allowing for material tailoring for specific applications. ,, There are many different types of ZIFs, which can be classified based on the type of metal ion or cluster used in their construction, the type of organic ligand used, and their pore size and shape. , The different types of metal linkers used are 2-nitroimidazole, 2-methylimidazole, benzimidazole, and metronidazole, and the metal oxides are Co 3 O 4 , ZnCoO X , ZnO, and CoS, as mentioned in Table . When ZIFs are used as pollutant-degrading catalysts, the pollutants are typically adsorbed onto the ZIFs’ surfaces. , A variety of chemical dynamics, including van der Waals forces, hydrogen bonds, and electrostatic forces, might mediate this adsorption process. , …”

“…ZIFs’ catalytic activity can be increased further by pyrolysis. In some studies, it can be observed that due to the modification in the ZIF structure using pyrolysis, the use of transition metal oxides, and the electrospinning method (ZIF-65/PAN, ZIF-67@γ-Al 2 O 3 , etc), leaching of the metals was reduced. , Pyrolysis can convert ZIFs into highly active and stable catalytic materials with catalytic activity greater than that of the original ZIFs. Pyrolysis can also create additional active sites within materials, which can improve their catalytic performance even further. , Another tailored application of a MOF is the preparation of a zinc and cobalt-based catalyst in the same molar (1:1) ratio with pristine ZIF8 and ZIF-67 as precursors under pyrolysis conditions for effective phenol degradation .…”

“…51,52 A variety of chemical dynamics, including van der Waals forces, hydrogen bonds, and electrostatic forces, might mediate this adsorption process. 36,20 ZIF-67, which includes the Co ion, is the most widely used ZIF for PMS activation. The Co ion plays a critical role in the activation of PMS, where Co 2+ reacts with HSO 5 − to generate SO 4…”

Metal organic framework-loaded polyethersulfone/polyacrylonitrile photocatalytic nanofibrous membranes under visible light irradiation for the removal of Cr(vi) and phenol from water

“…In another study, the performance of a SiO 2 –TiO 2 -loaded polyaniline nanofiber membrane was studied to degrade the methyl orange. 34 The prepared PAN/Ag–TiO 2 nanofiber membrane indicated the high photocatalytic activity for the complete removal of methylene blue within 1 h. 35 Pu et al 36 investigated the degradation of ciprofloxacin using a PAN/ZIF-65 MOFs nanofiber membrane. However, there is no study on the removal of phenol and Cr( vi ) using polyethersulfone (PES)/PAN/UiO-66-NH 2 /TiO 2 MOFs nanofiber membranes.…”