Magnetic chitosan-based adsorbent prepared via Pickering high internal phase emulsion for high-efficient removal of antibiotics.

A novel magnetic chitosan-g-poly(2-acrylamide-2-methylpropanesulfonic acid) (CTS-g-AMPS) porous adsorbent was prepared by grafting the AMPS onto the CTS in the Fe3 O4 stabilized Pickering high internal phase emulsions (Pickering-HIPEs) and used for the adsorptive removal of the antibiotics tetracycline (TC) and chlorotetracycline (CTC). The results of the structure characterization showed that porous structure of the adsorbent can be tuned easily by altering amount of Fe3 O4 -MNPs-M and the electrostatic attraction of between SO3 - and CTC, TC was the main adsorption driving force. The adsorption capacities of the adsorbent for TC and CTC can be reached to 806.60 and 876.60mg/g in a wide pH ranged from 3.0 to 11.0, respectively. And the adsorption equilibrium can be reached within 90min for TC and 50min for CTC. The magnetic porous adsorbent had good reusability, which can still attain a high adsorption capacity of 759.82 and 842.99mg/g for TC and CTC after five consecutive adsorption cycles, respectively. Therefore, the as-prepared CTS-g-AMPS magnetic adsorbent is potential to be used for adsorption removal of antibiotics from water.