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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 adsorptiondoi:10.3390/min11050518 fatcat:jovcvn4hujgqnbyr46brujuhdi