Abstract
The removal of triclosan, a widely used antibacterial agent in personal care products, from water was investigated by using dioctadecyldimethylammonium modified magadiite (2C18-MAG) and bentonite (2C18-BT) as the adsorbents. The adsorption kinetics were discussed, and the kinetic data were described by pseudo-second order model. The pseudo-second order kinetic rate constant of the triclosan adsorption on 2C18-MAG was 2.5 times larger than that on 2C18-BT. Langmuir and Freundlich adsorption models were employed to describe the results to discuss the interactions between triclosan and the adsorbents. The adsorption process was governed by the intermolecular interactions between triclosan and the intercalated surfactant of the adsorbents. The highest adsorbed amounts were 534 mg/g and 422 mg/g for 2C18-MAG and 2C18-BT, respectively. The efficient adsorption of triclosan on 2C18-MAG indicates the great opportunity of organically modified layered silicates as the adsorbent for the removal of organic contaminants in aqueous environment.
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