Use of Natural Clinoptilolite in the Preparation of an Efficient Adsorbent for Ciprofloxacin Removal from Aqueous Media

Minerals

Nevenka Rajić¹  Barbara Kalebić¹  Jelena Dikić²  Jelena Pavlović²  Nikola Škoro³  Aleksander Rečnik⁴  Sašo Gyergyek⁴ 

[1] Faculty of Technology and Metallurgy, University of Belgrade, 11120 Belgrade, Serbia;Innovation Centre of Faculty of Technology and Metallurgy, University of Belgrade, 11120 Belgrade, Serbia;Institute of Physics, University of Belgrade, 11080 Belgrade, Serbia;Jožef Stefan Institute, 1000 Ljubljana, Slovenia;

关键词: natural zeolite;    magnetite;    ciprofloxacin;    adsorption;    disinfection;   

DOI  :  10.3390/min11050518

来源: DOAJ

【 摘 要 】

The adsorption of the antibiotic ciprofloxacin (CIP) from an aqueous solution by natural zeolite, the calcium-rich clinoptilolite (CLI), and magnetite-coated CLI (MAG-CLI) was investigated. Both CLI and MAG-CLI showed a high adsorption affinity towards CIP at 283, 288 and 293 K at a pH of 5. Adsorption kinetics studied for the initial concentrations of 15–75 mg CIP dm⁻³ follow Lagergren’s pseudo-second order equation and the adsorption is best represented by the Langmuir model. The adsorption mechanism involves strong electrostatic interactions between negatively charged aluminosilicate lattice and the cationic form of CIP accompanied by an ion-exchange reaction. Magnetite coverage (approx. 12 wt.%) induces magnetism, which can facilitate the separation process. The coverage does not influence the adsorption activity of CLI. The leaching test showed that the MAG coating protects the adsorbent from CIP leaching. This is ascribed to interactions between the CIP carboxyl groups and magnetite nano-particles. Antibacterial tests showed strong antibacterial activity of the ciprofloxacin-containing adsorbents towards pathogenic E. coli and S. aureus.

【 授权许可】

Unknown