Swelling clay minerals play important roles on the fate and transport of certain antibiotics detected in the environment, which creates potential impacts on ecosystems without a proper watch. This research determined the adsorption and intercalation properties of ciprofloxacin (CIP), a second-generation antibiotic, on montmorillonite (SAz-1; CEC = 123 meq/100g) and rectorite (41 meq/100g) in aqueous solutions with initial CIP amounts up to 0.98 and 1.47 CEC. Adsorption experiments showed that most of the initial CIP were adsorbed within a reaction time of 24 h and the rate constants of CIP adsorption on montmorillonite were 37 times greater than those on rectorite under the various conditions studied. The maximum CIP adsorption capacities for montmorillonite and rectorite were evaluated as 1.00 mmol/g and 0.38 mmol/g, corresponding to 0.81 and 0.92 CEC, respectively.
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