Departamento de Ingeniería Bioquímica, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Prolongación de Carpio y Plan de Ayala s/n, Colonia Santo Tomás, México, DF, CP 11340, Mexico.
Bioresour Technol. 2013 May;136:635-43. doi: 10.1016/j.biortech.2013.02.059. Epub 2013 Feb 26.
The potential of Litchi chinensis seeds (LCS) for biosorption of Ni(II) ions from aqueous solutions was investigated in batch systems in terms of kinetics, equilibrium and thermodynamics. Experimental data showed that the biosorption capacity of LCS was dependent on operating variables such as solution pH, initial Ni(II) concentration, contact time, and temperature. The optimum pH value for Ni(II) biosorption was 7.5. Significant enhancement of Ni(II) biosorption was observed by increasing initial metal concentration and temperature. Modeling of sorption kinetics showed good agreement of experimental data with the pseudo-second-order kinetic model. Langmuir model exhibited the best fit to experimental data. According to this isotherm model, the maximum Ni(II) biosorption capacity of LCS is 66.62 mg g(-1). The calculated thermodynamic parameters showed that the biosorption of Ni(II) ions is an endothermic and non-spontaneous process. Results indicate that LCS can be used as an effective and environmentally friendly biosorbent to detoxify Ni(II)-polluted wastewaters.
以动力学、平衡和热力学为研究视角，采用间歇式体系，就荔枝核（LCS）从水溶液中吸附 Ni(II)离子的能力展开研究。实验数据表明，LCS 的吸附容量取决于溶液 pH 值、Ni(II)初始浓度、接触时间和温度等操作变量。Ni(II)吸附的最佳 pH 值为 7.5。通过增加初始金属浓度和温度，可明显增强 Ni(II)的吸附效果。吸附动力学模型表明，实验数据与拟二级动力学模型拟合良好。Langmuir 模型对实验数据的拟合效果最佳。根据这一吸附等温线模型，LCS 的最大 Ni(II)吸附容量为 66.62mg/g。计算得到的热力学参数表明，Ni(II)离子的吸附是一个吸热且非自发的过程。结果表明，LCS 可用作一种有效且环境友好的生物吸附剂，用于处理含 Ni(II)的废水。
