Abstract

Gholamali Haghdoost and Hossein Aghaie*

DOI : http://dx.doi.org/10.13005/ojc/320322

Corn cob as a low-cost adsorbent were used in the present work for the removal of toxic heavy metal Pb²⁺ from aqueous solutions. Bath experiments were used to determine the best adsorption conditions. The equilibrium adsorption level was determined as a function of solution pH, temperature(T), contact time(tc), initial adsorbate concentration, and adsorbent dosage. Effective removal of metal ions was demonstrated at pH values of 6. Metal adsorption onto Corn cobwas evaluated by Langmuir and Freundlich isotherms. Results indicate that the Langmuir isotherm model is the most suitable one for the adsorption process using Corn cob(R²=0.9742), thus indicating the applicability of monolayer coverage of Pb(II) ion on Corn cob surface.The relationship between thermodynamic parameters was used to predict the absorption process. According to Thermodynamic analysis, the process endothermic and natural (ΔH^o=-16.2 Jmol^-1 and ΔS^o =- 59.71 Jmol^-1 K^-1).

Piumbum(II); adsorption; Thermodynamic; Corn cob

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