Authors: Tao Wen Yuantao Chen Linsen Cai
Publish Date: 2011/07/16
Volume: 290, Issue: 2, Pages: 437-
Abstract
The sorption of CoII on Namontmorillonite was conducted under various conditions ie contact time adsorbent dosage pH ionic strength foreign ions fulvic acid FA humic acid HA and temperature Results of sorption data analysis indicated the sorption of cobalt on Namontmorillonite was strongly dependent on pH and ionic strength At low pH the sorption of CoII was dominated by outersphere surface complexation and ion exchange with Na+/H+ on Namontmorillonite whereas innersphere surface complexation was the main sorption mechanism at high pH The presence of different cations influenced CoII sorption while the presence of different anions had no differentiable influences on CoII sorption The presence of HA and FA decreased the sorption of CoII on montmorillonite The sorption isotherms are simulated well with the Langmuir model The thermodynamic parameters ΔH° ΔS° and ΔG° calculated from the temperature dependent isotherms indicated that the sorption reaction of CoII on montmorillonite was an endothermic and spontaneous process The sorption test revealed that the low cost material was a suitable material in the preconcentration of CoII from large volumes of aqueous solutions
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