| Removal of fluoride from aqueous solution by modified fly ash |
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| 作者姓名： | Li LUO Liang LU Guoqiang WU Jianjun CHEN |
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| 作者单位： | [1]Materials Science and Chemical Engineering Institute of Jinhua University, Zhejiang 321017, China [2]West Branch of Zhejiang University of Technology, Zhejiang 324000, China |
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| 摘 要： | Removal of fluoride from aqueous solution by modified fly ash was studied in batch model. The influences of the contact time, the initial F^- concentration, the dosage of fly ash, and the temperature on removal of F have been studied, respectively. It was found that fly ash modified with dilute HCl has the maximum adsorption of fluoride from aqueous solutions, and that the retention of fluoride ions by material was 85% or higher with initial 10 mg F^-/L. First-order kinetics was observed for the adsorption process, which follows the Langrnuir and Freundlich isotherms. The thermodynamic parameters such as ΔG0, ΔH0, ΔS0 were calculated from Langmuir constants. The positive value of ΔH0 （1.273 J/mol） confirms the endothermic nature of adsorption.
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| 关 键 词： | 飞尘 氟化物 吸附作用 平衡 大气污染 |
Removal of fluoride from aqueous solution by modified fly ash |
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| Li LUO Liang LU Guoqiang WU Jianjun CHEN.Removal of fluoride from aqueous solution by modified fly ash[J].Chinese Journal of Geochemistry,2006,25(B08):129-129. |
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| Abstract: | |
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| Keywords: | fly ash fluoride adsorption equilibrium kinetics |
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