文章基本信息

标题：Adsorption studies of phosphate ions on alginate-calcium carbonate composite beads
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作者：Zahid Mahmood ; Saqib Nasir ; Nadia Jamil 等
期刊名称：African Journal of Environmental Science and Technology
电子版ISSN：1996-0786
出版年度：2015
卷号：9
期号：3
页码：274-281
DOI：10.5897/AJEST2014.1784
语种：English
出版社：Academic Journals
摘要：Alginate-calcium carbonate composite beads was prepared by the sol-gel method and characterized by Fourier transform infra-red spectroscopy (FT-IR) and scanning electron microscope (SEM) instruments. Adsorption potential of phosphate ions have been studied on laboratory scale. The effects of contact time, adsorbent dosage, initial analyte concentration, pH and agitation speed were optimized at 298.15 K (25°C) in a single ion system. The adsorption process was in accordance with Freundlich model and pseudo second order kinetics. Thermodynamic parameters like ∆G°, ∆H° and ∆S° have also been determined. Negative values of ∆G establish the favorability of the process. Values of ∆H and ∆S indicate that the process was endothermic and during the adsorption of phosphate ions (PO4-3), less randomness takes place at the adsorbent-adsorbate interface.
关键词：Alginate-calcium carbonate; composite beads; phosphate ion adsorption