Adsorptive removal of tetracycline and ciprofloxacin antibiotics from water using magnetic MIL101-Fe metal–organic framework/NiFe2O4 decorated with Preyssler-Pope-Jeannin [NaP5W30O110]14− polyanion

In the current study, Preyssler-Pope-Jeannin K12.5Na1.5[NaP5W30O110]⋅15H2O heteropolyanions (abbreviated as {NaP5W30}) were successfully decorated on MIL101- Fe metal-organic framework containing nickel ferrite (NiFe2O4; NFO) as a magnetic component via a hydrothermal method. The characterization of the composition, structure, and morphology of the magnetic{NaP5W30}/MIL101-Fe/NFO nanocomposite was achieved using various analyses. The results showed that the {NaP5W30} heteropolyanion was encapsulated into the MIL101-Fe framework. The magnetic nanocomposite played the role of a great adsorbent for separating tetracycline (TC) and ciprofloxacin (CIP) antibiotic drugs from aqueous solutions. The factors like initial drug concentration, pH, temperature, and adsorbent dosage were investigated. The adsorption kinetics could be accurately described based on the Langmuir isotherm and the pseudo-second-order models. The outcomes suggested that the nanocomposite adsorbed 100% of drugs in 9 ​min for TC and 20 ​min for CIP from water with a maximum adsorption capacity of 263.15 ​mg ​g−1 and 796.23 ​mg ​g−1 respectively. The nanocomposite was highly stable and recyclable without any change in its structure thus making it a great choice for removing drugs from polluted water.