Thermodynamic study of lead ion removal by adsorption onto nanographene sheets
الموضوعات : Journal of Physical & Theoretical ChemistryY. Saghapour 1 , M. Aghaie 2 , K. Zare 3
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الکلمات المفتاحية: Nanographene, Pb2+ions, Adsorption, Isotherm, thermodynamics,
ملخص المقالة :
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.
