Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9674095 | Journal of Hazardous Materials | 2005 | 7 Pages |
Abstract
Unburned carbon in fly ash is an important by-product from coal combustion. In this investigation, unburned carbon has been separated from fly ash and been employed as a low cost adsorbent for a basic dye adsorption (Rhodamine B) in aqueous solution. Adsorption isotherm and kinetics of adsorption have been investigated using batch experiments. It is found that dye adsorption capacity depends on initial concentration, pH of solution, and temperature. The adsorption isotherm can be described by Langmuir model and the adsorption capacity of Rhodamine B at 30, 40, and 50 °C can reach 9.7 Ã 10â5, 1.14 Ã 10â4, and 1.5 Ã 10â4 mol gâ1, respectively. The pseudo first- and second-order kinetic models have been employed to fit the dynamic adsorption. It is found that the dynamic adsorption follows the pseudo second-order model. Thermodynamic calculations indicate that the adsorption is endothermic reaction with ÎH° at 25 kJ molâ1.
Related Topics
Physical Sciences and Engineering
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Authors
Shaobin Wang, Huiting Li,