Use of rice husk ash for adsorptive removal of cobalt (II) ions along with kinetic, isothermal and thermodynamical modelling. | [Journal of Chemical Society of Pakistan • 2013]

Author(s):

1. Uzma Zafar: Minerals Processing Research Centre (MPRC), PCSIR Laboratories Complex, Lahore, Lahore, Pakistan

2. Sumra Naeem: Minerals Processing Research Centre (MPRC), PCSIR Laboratories Complex, Lahore, Lahore, Pakistan

3. Rabia Rehman: Institute of Chemistry, University of the Punjab, Lahore, Pakistan

4. Muhammad Zia-Ul-Haq: Research Institute of Pharmaceutical Sciences, Department of Pharmacognosy, University of Karachi, Karachi, Pakistan

5. Nazir Ahmad: Department of Chemistry, University of Sargodha, Sargodha, Pakistan

Abstract:

Rice husk ash (RHA) has been employed in this research work for Co (II) ions adsorptive amputation from water in batch mode. Optimized conditions for Co (II) adsorption came out as: pH ≈ 7.5, adsorbent dose ≈ 20 gl-1 of metal ion solution and equilibrium time ≈ 120 minutes for the initial Co (II) concentration range of 50-200 mgl-1, following pseudo-second order kinetics. Langmuir isothermal model was more applicable as compared to Freundlich and Dubnin-Radushkevich (D-R), within the concentration range studied; indicating that monolayer chemisorption of Co (II) ions occurred on homogenously distributed binding sites on RHA. Thermodynamic parameters value of ?H0=-18.448KJ/mole and ?G0=-5.195KJ/mol at 283K suggests that the adsorption of Co (II) on RHA is an exothermic and spontaneously feasible process. ?G0 becomes less negative at higher temperature and therefore less cobalt is adsorbed at higher temperatures. So, it is concluded from this study that RHA can be effectively used for adsorption of Co (II) ions.

Page(s): 296-303

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 35, Issue: 2, Year: 2013

Keywords:

Keywords are not available for this article.

References:

References are not available for this document.

Citations

Citations are not available for this document.

Citations

Downloads

Views