Equilibrium, thermodynamic and kinetic studies for the biosorption of aqueous lead(II), cadmium(II) and nickel(II) ions on Spirulina platensis
- 作者：Ayş ; egü ; l Ş ; eker ; Talal Shahwan ; Ahmet E. Eroğ ; lu ; Sinan Yı ; lmaz ; Zeliha Demirel ; Meltem Conk Dalay
- 关键词：Spirulina platensis ; Biosorption ; Heavy metal ; Sorption isotherm
- 刊名：Journal of Hazardous Materials
- 出版年：2008
- 期刊代码：50_03043894
- 类别：ce
- 出版时间：15 June 2008
- 卷：154
- 期：1-3
- 页码：973-980
- 文件大小：651 K
摘要
The biosorption of lead(II), cadmium(II) and nickel(II) ions from aqueous solution by Spirulina platensis was studied as a function of time, concentration, temperature, repetitive reactivity, and ionic competition. The kinetic results obeyed well the pseudo second-order model. Freundlich, Dubinin Radushkevich and Temkin isotherm models were applied in describing the equilibrium partition of the ions. Freundlich isotherm was applied to describe the design of a single-stage batch sorption system. According to the thermodynamic parameters such as ΔG°, ΔH°and ΔS° calculated, the sorption process was endothermic and largely driven towards the products. Sorption activities in a three metal ion system were studied which indicated that there is a relative selectivity of the biosorbent towards Pb2+ ions. The measurements of the repetitive reusability of S. platensis indicated a large capacity towards the three metal ions.