Study on the Adsorption of Anionic Antibiotics on Natural Clay Minerals Modified by Ionic Liquids

Firstly, the preparation and adsorption experimental methods of the three characteristics of cationic minerals were introduced. Secondly, the adsorption and mechanism of the three ionic liquid-modified minerals on CAP were described, and the following six conclusions were reached. (1) SEM characterized the successful preparation of ionic liquid modified zeolite, montmorillonite, and illite. (2) The contact angle test characterized that the lipophilicity of the surface of zeolite, montmorillonite, and illite was increased through ionic liquid modification, which was conducive to the adsorption of organic antibiotics. (3) The Zeta potential test characterized the transition process of the surface electrical properties of the three clay minerals from neutral and negative to positive. (4) The adsorption experiment showed that the adsorption capacity of unmodified clay minerals to CAP was weak, and the adsorption performance of modified minerals with different modifier dosages to anionic CAP was greatly improved. (5) The adsorption behavior of pore structure zeolite (pore size smaller than the molecular size of ionic liquid and CAP) and non-expandable illite on ionic liquid and CAP were mainly surface adsorption. (6) The characteristic functional groups of ionic liquid appeared on the surface of modified zeolite, montmorillonite, and illite.