The influence of the nature of metallocenter on the efficiency of fluoroquinolones removal from aqueous media using metal-chelate sorbents based on covalently cross-linked carboxyethylchitosan. D.A. SHASHURA, Yu.O. PRIVAR

Abstract

The influence of the nature of metallocenter on the efficiency of fluoroquinolones removal from aqueous media using metal-chelate sorbents based on covalently cross-linked carboxyethylchitosan. D.A. SHASHURA, *Yu.O. PRIVAR (Institute of Chemistry, FEB RAS, Vladivostok). *E-mail: privar.juliya@gmail.com

In this work feasibility to remove fluoroquinolone antibiotics (ciprofloxacin, pefloxacin, levofloxacin) using metal chelate sorbents based on N-(2-carboxyethyl)chitosan (CEC) with immobilized ions Al3+, Cu2+, Ni2+, and Zn2+ has been investigated. The sorption of fluoroquinolones on the fabricated metal-chelate sorbents was studied depending on pH and the nature of the metallocenter. It was shown that the removal efficiency increased with increasing stability constants of the fluoroquinolones complexes with corresponding metal ions, and the maximal efficiency was found for CEC with immobilized Al3+ ions for all antibiotics studied. Regardless of the nature of metallocenter, the removal efficiency decreased in the order  pefloxacin>ciprofloxacin>levofloxacin. The maximum degree of fluoroquinolones removal using metal-chelate sorbent CEC containing Al3+ ions was achieved in the pH range from 6.5 to 9.5.