Thermodynamic study of lead ion removal by adsorption onto nanographene sheets

Subject Areas : Journal of Physical & Theoretical Chemistry

Y. Saghapour ¹ , M. Aghaie ² , K. Zare ³

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Received: 2014-04-25 Accepted : 2014-04-25 Published : 2013-04-01

Keywords: Nanographene, Pb2+ions, Adsorption, Isotherm, thermodynamics,

Abstract :

A batch adsorption study was applied to investigate the adsorption of Pb2+ ions from aqueous solutionby nanographene (nG).The adsorption percentage of Pb2+ions onto nG samples at different initial pH,contact time (tc), adsorbent dosage (mnG) and temperature (T) were investigated. The results showedthat nG is an excellent adsorbent for Pb2+ions removal from aqueous solutions with an adsorptionpercentage of up to 79.8% at initial Pb2+concentration of 20ppm and temperature of 298K.Theexperimental data could be well described by the Freundlich and Langmuire isotherm model;thermodynamic parameters of adsorption process (AG0, AH0, ASo) were also evaluated. The overalladsorption process was exothermic and spontaneous in nature .The results indicate that Pb2+ionsadsorption onto nG may be chemisorption.