Uranium removal from aqueous solution by coir pith: equilibrium and kinetic studies.
Uranium removal from aqueous solution by coir pith: equilibrium and kinetic studies.
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DOI：
10.1016/j.biortech.2004.10.016
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发表时间：
2005-07
影响因子：
11.4
通讯作者：
Harshala Parab;S. Joshi;Niyoti Shenoy;R. Verma;A. Lali;M. Sudersanan
中科院分区：
文献类型：
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作者：
Harshala Parab;S. Joshi;Niyoti Shenoy;R. Verma;A. Lali;M. Sudersanan
用间歇平衡法研究了椰芯吸附铀的基本情况。考察了终溶液pH值、吸附剂用量、吸附时间、温度和不同铀浓度等实验参数对吸附效果的影响。在pH为4.0-6.0的范围内有最大的铀吸附。吸附平衡的数学描述采用Freundlich和Langmuir吸附模型。在所研究的铀浓度范围(200-800 mg/L)和温度(305-336K)内，平衡数据均符合平衡模型。在317K，终溶液pH值为4.3，初始铀浓度为800 mg/L时，椰子髓对铀的吸附能力最大，吸附动力学符合二级吸附。结果表明，该吸附剂适用于水溶液中铀的脱除。0.2N HCl对铀有较好的解吸作用。结果表明，天然丰富的椰髓在去除水溶液中的铀方面具有很大的应用潜力。
Basic aspects of uranium adsorption by coir pith have been investigated by batch equilibration. The influence of different experimental parameters such as final solution pH, adsorbent dosage, sorption time, temperature and various concentrations of uranium on uptake were evaluated. Maximum uranium adsorption was observed in the pH range 4.0–6.0. The Freundlich and Langmuir adsorption models were used for the mathematical description of the adsorption equilibrium. The equilibrium data fitted well to both the equilibrium models in the studied concentration range of uranium (200–800 mg/l) and temperatures (305–336 K). The coir pith exhibited the highest uptake capacity for uranium at 317 K, at the final solution pH value of 4.3 and at the initial uranium concentration of 800 mg/l. The kinetics of the adsorption process followed a second-order adsorption. The adsorbent used proved to be suitable for removal of uranium from aqueous solutions. 0.2 N HCl was effective in uranium desorption. The results indicated that the naturally abundant coir pith of otherwise nuisance value exhibited considerable potential for application in removal of uranium from aqueous solution.