Analytical Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2010;45(5):603-11. doi: 10.1080/10934521003595662.
The applicability of low-cost lignocellulosic biosorbent-coir pith, for removal of cobalt (II) from aqueous solutions using batch adsorption studies has been explored herein. Adsorption characteristics of coir pith were investigated systematically by varying the experimental parameters such as, solution pH, initial metal ion concentration, contact time, adsorbent dose and temperature. The studies revealed that optimum adsorption of cobalt onto coir pith occurred in the pH range of 4.0 - 7.0. Sorption kinetics of cobalt was found to be quite rapid under ambient conditions and the process followed second-order kinetics. The experimental data have been analyzed using non-linearized forms of Langmuir, Freundlich and Redlich-Peterson adsorption isotherms for mathematical description of the process. Desorption studies showed that the quantitative recovery of Co (II) from the spent coir pith was achieved by using 0.5 N HCl. The suitability of this adsorbent for real situation has been observed, when complete removal of cobalt from nuclear power plant coolant water was obtained. The present studies successfully demonstrated the use of coir pith as an efficient adsorbent material for removal of cobalt from aqueous solutions.
本文探讨了低成本木质纤维素生物吸附剂-椰壳纤维，用于通过批量吸附研究从水溶液中去除钴（II）的适用性。通过改变实验参数，如溶液 pH 值、初始金属离子浓度、接触时间、吸附剂剂量和温度，系统地研究了椰壳纤维的吸附特性。研究表明，椰壳纤维对钴的最佳吸附发生在 pH 值为 4.0-7.0 的范围内。钴的吸附动力学在环境条件下非常迅速，该过程遵循二级动力学。使用非线性形式的 Langmuir、Freundlich 和 Redlich-Peterson 吸附等温线对实验数据进行了分析，以数学描述该过程。解吸研究表明，使用 0.5 N HCl 可以从用过的椰壳纤维中定量回收 Co(II)。从核电厂冷却水中完全去除钴，观察到该吸附剂在实际情况下的适用性。本研究成功地证明了椰壳纤维作为一种从水溶液中去除钴的有效吸附材料的用途。
