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Effect of Temperature on Cd2+ Sorption by Mixed Oxides of Iron and Silicon

✍ Scribed by Syed Mustafa; Muhammad Waseem; Abdul Naeem; Khizar Hussain Shah; Tauqeer Ahmad; Muhammad Safdar

Publisher
John Wiley and Sons
Year
2010
Tongue
English
Weight
124 KB
Volume
28
Category
Article
ISSN
0256-7660

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✦ Synopsis

Abstract

The current study focuses on the synthesis and sorption properties of two mixed oxides of iron and silicon prepared by physical mixing (M~1~) and sequential precipitation methods (M~2~). Both the mixed oxides were synthesized from equimolar ratios of Fe(OH)~3~ and SiO~2~ and characterized for surface area, EDX, XRD and PZC. The surface area, micropore volume and average pore width of the oxide M~1~ were higher as compared to the oxide M~2~. However, potentiometric titrations revealed that mixed oxide synthesized by this method had a very high capacity towards Cd^2+^ ions as compared to the mixed oxide M~1~. Sorption of Cd^2+^ ions at pH 5 on mixed oxide, M~2~ was found to increase with temperature in the range 288 to 318 K. Langmuir equation was found applicable to the sorption data with R^2^>0.99. Entropy (Ξ”__S__^βŠ–^), enthalpy (Ξ”__H__^βŠ–^) and free energy changes (Ξ”__G__^βŠ–^) were calculated which revealed the process to be endothermic and spontaneous in nature.

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