Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
145247 | Chemical Engineering Journal | 2016 | 49 Pages |
Abstract
A novel and environmental friendly aerogel composite was synthesized by freeze-drying method using humic acid as low cost starting material. The as-prepared aluminum-humic acid-lanthanum (Al-HA-La) aerogel composites were fully characterized by nitrogen adsorption-desorption, SEM, EDX, XRD, FTIR and TGA Then, the adsorption behaviors of fluoride on Al-HA-La adsorbent were investigated systematically, including the influence of initial pH, adsorption kinetics, adsorption isotherms, desorption study, etc. Batch adsorption experimental results showed that the high fluoride removal of Al-HA-La was obtained in a wide initial pH range from 5 to 11. The adsorption equilibrium was achieved within 40 min (pH = 7.0), and the adsorption kinetics could be well fitted by the pseudo-second-order model. The adsorption isotherms could be well described by the Langmuir isotherm model and the maximum adsorption capacity calculated from Langmuir model was high up to 50 mg gâ1 at 298 K (pH = 7.0). Moreover, the co-existing of other anions and cations showed limited influence on the adsorption of fluoride on Al-HA-La. Furthermore, the fluoride adsorbed on Al-HA-La could be effectively desorbed using 10â2 mol Lâ1 NaOH, and the desorption efficiency was as high as 90%.
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Physical Sciences and Engineering
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Authors
Yong Liu, Qin Fan, Shixiang Wang, Yanlan Liu, Anlan Zhou, Lu Fan,