Kinetic Study of Sr2+Sorption by Bone Char
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The effect of particle size, bone char mass, initial pH, and metal concentration on the kinetics of Sr2+ sorption by bone char was studied and discussed. Considering the sorbed amounts of Sr2+, solution pH changes, changes of Ca2+ concentrations and Ca/Sr molar ratios, with time, it was concluded that surface complexation reactions are dominant in the first, more rapid stage of the sorption process, while the contribution of the ion-exchange mechanism increases with time and becomes more significant in the second, slower phase. Under all investigated experimental conditions, the pseudo-second-order model was found to provide high correlation coefficients and the equilibrium amounts of Sr2+ sorbed comparable to the values obtained experimentally.
Keywords:Bone char / kinetic models / sorption kinetics / Sr2+
Source:Separation Science and Technology, 2009, 44, 3, 645-667
- Ministry of Science and Environmental Protection of the Republic of Serbia