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Effect of lead on the sorption of phenol onto montmorillonites and organo-montmorillonites-ScienceDirect

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Journal of Colloid and Interface Science

Volume 308, Issue 1

, 1 April 2007, Pages 11-19

Journal of Colloid and Interface Science

Effect of lead on the sorption of phenol onto montmorillonites and organo-montmorillonites

Abstract

The effect of lead (Pb) on the sorption of phenol onto montmorillonite-based sorbents was studied using a batch equilibration method when phenol and Pb were sorbed simultaneously and either Pb or phenol was previously sorbed. The sorbents were Na+-, Ca2+-, hexadecyl trimethylammonium (HDTMA)-Na+-, and HDTMA-Ca2+-montmorillonites. Pb diminished the sorption of phenol largely onto Na+– or Ca2+-montmorillonites, while phenol had little effect on the sorption of Pb onto all sorbents. Pb had no effect on the sorption of phenol onto HDTMA-Na+– or HDTMA-Ca2+-montmorillonites either. The sorption capacity of phenol followed the order HDTMA-Na+– > HDTMA-Ca2+– > Na+– > Ca2+-montmorillonites. The pseudo-second-order equation described the kinetics of phenol sorption well. Sorption isotherms of phenol followed the Freundlich equation. Phenol sorption on HDTMA-Na+– and HDTMA-Ca2+-montmorillonites was linear, while that on Na+– and Ca2+-montmorillonites was nonlinear.

Graphical abstract

Effect of Pb on the sorption of phenol was evaluated. For Na+– and Ca2+-montmorillonites the sorption of phenol decreased clearly when Pb was added simultaneously. In contrast, Pb had insignificant effect on the sorption of phenol on HDTMA-Na+– and HDTMA-Ca2+-montmorillonites.

Keywords

Na+

Ca2+
HDTMA-Na+
and HDTMA-Ca2+-montmorillonites
Sorption
Sorption kinetics
Phenol
Pb

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