Removal of sulfadiazine from aqueous solution on kaolinite

Abstract

The adsorption of sulfadiazine onto kaolinite clay as an alternative adsorbent was examined in aqueous solution. Impacts of the contact time, pH, temperature, ionic strength and coexistent surfactants on the adsorption process were evaluated. The pH significantly influenced the adsorption process, with adsorption being promoted at lower pH due to the cation exchange mechanism. Decreasing ionic strength in the solution was favorable for adsorption, and the addition of cationic and anionic surfactants had negative effects on the adsorption capacity of sulfadiazine on kaolinite. Kinetic experiments showed that the adsorption followed the pseudo-second-order model. The equilibrium adsorption was well described by both Freundlich and Dubinin-Radushkevich (DR) models. According to the DR model, the adsorption mechanism was determined by cationic exchange and weak physical forces. The thermodynamic study showed that sulfadiazine adsorption onto kaolinite was a spontaneous and endothermic reaction.

Keywords

adsorption / kaolinite / sulfadiazine / kinetics

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Acknowledgements

This work was financially supported by the National Basic Research Program of China (No. 2008CB418201), National Science Foundation of China (Grant Nos. 20977051 and 51178438) and the Public Welfare Project of Basic Scientific Research for S&R Institutes (No. 2010KYYW03).

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