Biosorption of uranium from aqueous solutions by nonliving biomass of marinealgae Cystoseira indica
Biosorption of uranium from aqueous solutions by nonliving biomass of marinealgae Cystoseira indica
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DOI：
10.4067/s0717-34582006000200003
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发表时间：
2006-04
影响因子：
2.7
通讯作者：
M. H. Khani;A. Keshtkar;Behrouz Meysami;M. Zarea;R. Jalali
中科院分区：
文献类型：
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作者：
M. H. Khani;A. Keshtkar;Behrouz Meysami;M. Zarea;R. Jalali
重金属的生物吸附是去除和回收水溶液中重金属离子的有效方法。本文在间歇式系统中研究了质子化、钙预处理和未预处理的印度泡塞藻对铀的生物吸附。动力学研究结果表明，铀在质子化和未经预处理的生物质上的吸附遵循准二级动力学。pH值对印度泡塞藻平衡铀吸附量的影响表明，在pH值为4，铀浓度为350 mg/l时，吸铀量最高。在不同的初始铀浓度从50到1000毫克/升，批量吸附平衡在30 ℃内达到3小时内和吸附等温线的Langmuir和Freundlich模型进行了解释。平衡数据拟合非常好的朗缪尔模型的所有研究形式的Cystoseira indica藻类。Freundlich等温线不能像Langmuir模型那样很好地拟合质子化和未经预处理的印度囊绥藻的平衡数据。在pH 4和30 oC条件下，经Ca处理、质子化和未处理的Cystoseira indica藻对铀的最大吸附量分别为454.5、322.58和224.67 mg/g。
Biosorption of heavy metals can be an effective process for the removal and recovery of heavy metal ions from aqueous solutions. In this paper uranium biosorption by protonated, Ca-pretreated and non-pretreated Cystoseira indica algae biomass was investigated in a batch system. The results of the kinetic studies showed that the sorption of uranium on protonated and non-pretreated biomass followed pseudo-second order kinetics. The effect of pH on the equilibrium uranium sorption capacity of Cystoseira indica exhibited that highest uptake occurred at pH 4 at a solution with 350 mg/l uranium concentration. At various initial uranium concentrations from 50 to 1000 mg/l, batch sorption equilibrium at 30oC was reached within 3 hrs and the sorption isotherms were interpreted in terms of the Langmuir and Freundlich models. Equilibrium data fitted very well to Langmuir model for all studied forms of Cystoseira indica algae. The Freundlich isotherm cannot fit as well as the Langmuir model the equilibrium data of protonated and non-pretreated Cystoseira indica algae. The maximum uranium adsorption capacity on the Ca-pretreated, protonated and non-pretreated Cystoseira indica algae predicted by Langmuir isotherm at pH 4 and 30oC was 454.5, 322.58 and 224.67 mg/g respectively.