Jonaki, Board of Radiation and Isotope Technology, Department of Atomic Energy, CCMB Campus, Uppal Road, Hyderabad 500 007, Andhra Pradesh, India.
J Hazard Mater. 2010 Jun 15;178(1-3):851-60. doi: 10.1016/j.jhazmat.2010.02.016. Epub 2010 Feb 11.
Gum kondagogu (Cochlospermum gossypium), an exudates tree gum from India was explored for its potential to decontaminate toxic metal ions in aqueous solution. The toxic metal ions nickel and total chromium biosorption capacity of the gum kondagogu were studied in the batch experimental mode. The optimum conditions of biosorption were determined by investigating pH, contact time, and initial metal ion and biosorbent concentrations. The Freundlich and Langmuir adsorption models were used for the mathematical description of biosorption equilibrium and the data were analyzed on the basis of pseudo-second-order kinetic model. The maximum biosorption capacity of gum kondagogu as calculated by Langmuir model were found to be 50.5 mg g(-1) for nickel at pH 5.0+/-0.1 and 129.8 mg g(-1) for total chromium at pH 2.0+/-0.1, respectively. FTIR, SEM-EDXA and XPS analysis were used to evaluate the binding characteristics of gum kondagogu with metals. The experimental results demonstrate that the metal-ion interaction occurs through ion-exchange, adsorption and precipitation mechanisms.
印度产的胶木（Cochlospermum gossypium）是一种渗出树胶，研究了其从水溶液中去除有毒金属离子的潜力。采用间歇实验模式研究了胶木对镍和总铬的毒性金属离子的生物吸附能力。通过研究 pH 值、接触时间以及初始金属离子和生物吸附剂浓度，确定了生物吸附的最佳条件。采用 Freundlich 和 Langmuir 吸附模型对吸附平衡进行了数学描述，并基于拟二级动力学模型对数据进行了分析。根据 Langmuir 模型计算，在 pH 值为 5.0+/-0.1 时，胶木对镍的最大生物吸附容量为 50.5 mg g(-1)，在 pH 值为 2.0+/-0.1 时，对总铬的最大生物吸附容量为 129.8 mg g(-1)。利用傅里叶变换红外光谱（FTIR）、扫描电子显微镜-能谱分析（SEM-EDXA）和 X 射线光电子能谱（XPS）分析评估了胶木与金属的结合特性。实验结果表明，金属离子的相互作用是通过离子交换、吸附和沉淀机制发生的。
