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Title: Removal of Ni (II) from aqueous solutions by adsorption onto <i style="">Cajanus cajan L </i>Milsp seed shell activated carbons
Authors: Thamilarasu, P
Sivakumar, P
Karunakaran, K
Keywords: Activated carbon
<i>Cajanus cajan L</i>
Issue Date: Sep-2011
Publisher: NISCAIR-CSIR, India
Abstract: The adsorptive removal of Ni(II) from aqueous solution using <i>Cajanus cajan L </i>Milsp seed shells activated carbon (CCC) and polypyrrole coated <i>Cajanus cajan L </i>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 <img src='/image/spc_char/delta.gif' border=0>H<sup>o</sup>, <img src='/image/spc_char/delta.gif' border=0>S<sup>o</sup>, and <img src='/image/spc_char/delta.gif' border=0>G<sup>o </sup>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.
Description: 414-420
ISSN: 0975-0991 (Online); 0971-457X (Print)
Appears in Collections:IJCT Vol.18(5) [September 2011]

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