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Title: Removal of Ni (II) from aqueous solutions by adsorption onto Cajanus cajan L Milsp seed shell activated carbons
Authors: Thamilarasu, P
Sivakumar, P
Karunakaran, K
Keywords: Activated carbon;Adsorption;Cajanus cajan L;Isotherm;Kinetics;Nickel(II)
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: The adsorptive removal of Ni(II) from aqueous solution using Cajanus cajan L Milsp seed shells activated carbon (CCC) and polypyrrole coated Cajanus cajan L Milsp seed shells activated carbon (PPy/CCC) has been carried out under various experimental conditions. Quantity of Ni(II) uptake at 50 mg of activated carbon is 25.75 mg/g for CCC and 29.60 mg/g for PPy/CCC. Adsorption data are modeled with Freundlich, Langmuir and Temkin adsorption isotherms. Thermodynamics parameters, such as Ho, So, and Go have been calculated and the findings indicate that the adsorption is spontaneous and endothermic. Enthalpy change values range from 8.90 kJ/mol to 23.04 kJ/mol, and based on these values the adsorption of Ni(II) by CCC could be a physisorption. A mechanism involving intra particle diffusion and surface adsorption has been proposed for the adsorption of Ni(II) onto the adsorbent. Adsorbent used in this study is also characterized by FT-IR and SEM before and after the adsorption of metal ions.
Page(s): 414-420
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.18(5) [September 2011]

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