Simultaneous degradation of binary fluoroquinolone antibiotics by B and N in-situ self-doped guar gum hydrogel

Chemosphere. 2023 Sep 15:140197. doi: 10.1016/j.chemosphere.2023.140197. Online ahead of print.ABSTRACTUsing guar gum (GG) as the raw material and borax (B) as the cross-linker, zeolitic imidazolate framework-8 (ZIF-8) was in-situ loaded into the 3D network of GG hydrogel, forming a highly efficient catalytic material GG-B-ZIF-8 combined with a subsequent low-temperature calcination process. In GG-B-ZIF-8 activated peroxymonosulfate (PMS) system, binary norfloxacin (NOR) and ciprofloxacin (CIP) could be removed simultaneously, with the degradation efficiency of >99.9% within 1 h. This system was adaptable to a wide pH range of 3.0-9.0, and was also highly resistant to 5-20 mM Cl- and 10-40 mg/L humic acid. The degradation process was dominated by free radical O2•-, non-radical 1O2 and electron transfer, with eleven degradation products identified for NOR and nine for CIP via eight possible degradation pathways. Finally, the potential eco-toxicity of NOR, CIP and degradation intermediates was evaluated using the ECOSAR method.PMID:37717915 | DOI:10.1016/j.chemosphere.2023.140197

Source: Chemosphere - September 17, 2023 Category: Chemistry Authors: Mingzhe Li Mengling Ma Ziwei Zhao Mingkun Bao Nan Zhang Yun Zhou Yian Zheng Source Type: research