Abstract
The effect of surface functional groups 3-aminopropyltriethoxy- and 4-(triethoxysilyl)-butyronitrile-, 3-mercaptopropyltriethoxy-, phenyltrimethoxy-, and n-octyl-dimethoxychloro- grafted superparamagnetic particles coated with hexagonal mesoporous silicas (HMS-SPs) on the adsorption of ciprofloxacin (CIP) was evaluated. CIP adsorption followed the pseudo-second-order kinetic model, and intraparticle diffusion was suggested to be the rate-controlling step. Higher CIP adsorption capacities revealed on the hydrophobicity of the adsorbents, however, the phenyltrimethoxy group had the highest adsorption capacity due to the interaction of ¶–¶ electron-donor acceptors. The adsorption capacities strongly depended on an electrostatic interaction, with the exception of the phenytrimethoxy group. The presence of tannic acid (TA) could increase the adsorption capacity of CIP on adsorbent surfaces by multilayer adsorption between a positively charged amine group of CIP and negatively charged TA.
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