Temperature effect on the sorption of alkaline earth metal cations on, Si02 surface. | [Journal of Chemical Society of Pakistan • 2003]

Author(s):

1. S. Mustafa: National Centre of Excellence in Physical Chemistry, University of Peshawar, NWFP, Pakistan

2. B. Dilara: National Centre of Excellence in Physical Chemistry, University of Peshawar, NWFP, Pakistan

3. A. Naeem: National Centre of Excellence in Physical Chemistry, University of Peshawar, NWFP, Pakistan

4. N. Rehana: National Centre of Excellence in Physical Chemistry, University of Peshawar, NWFP, Pakistan

5. S. Murtaza: National Centre of Excellence in Physical Chemistry, University of Peshawar, NWFP, Pakistan

Abstract:

The sorption of Ca 2` and Mgt{ ions on the silica was studied as a function of concentration and temperature. The extent of sorption of the metal ,cations was found to increase with the increase in both the concentration and temperature of the. system. It was found that the Ca 2+ ion with its smallest hydrated radii was able to reach the surface easily and was held more strongly as compared to Mgt+ ion. The sorption of metal cations was accompanied by the release of H+ to the bulk phase. The sorption data fitted the linear form of the Langmuir equation. The positive values of AH for the uptake of the metal ions on Si02 showed their sorption mechanism to be endothermic in nature. Both the positive AS and negative AG values confirmed the spontaneous nature of the sorption process.

Page(s): 188-192

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 25, Issue: 3, Year: 2003

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