Rio de Janeiro State University, Programa de Pós-graduação em Engenharia Química, Rua São Francisco Xavier, 524 Maracanã, Rio de Janeiro CEP 20550-900, Brazil.
Bioresour Technol. 2010 Jul;101(14):5104-11. doi: 10.1016/j.biortech.2010.01.138. Epub 2010 Feb 20.
The present work describes our study on the competitive biosorption of Cd(II) and Zn(II) ions onto Sargassum filipendula from single component and binary systems. Results showed that S. filipendula was an efficient biosorbent for the removal of Cd(II) and Zn(II) ions from an aqueous solution. The equilibrium experimental data for the single component system for the two metallic species fitted well to Langmuir and Langmuir-Freundlich isotherm models. Seven isotherm models were tested with the equilibrium data for modeling of the binary system. Based on the sum of squares error, the Langmuir-Freundlich isotherm model showed the best fit to the binary adsorption data. The influence of the additional cation on the behavior of the biosorption of Cd(2+) and Zn(2+) was analyzed comparing single component and binary isotherms. It was observed that Zn(2+) had a relevant effect on the Cd(2+) biosorption, but the interference of Cd(2+) on the sorption of Zn(2+) was considerably less intense.
本工作描述了我们对 Sargassum filipendula 从单组分和双组分体系中竞争吸附 Cd(II)和 Zn(II)离子的研究。结果表明，S. filipendula 是一种从水溶液中去除 Cd(II)和 Zn(II)离子的有效生物吸附剂。单组分体系的平衡实验数据对两种金属物种均符合 Langmuir 和 Langmuir-Freundlich 等温吸附模型。用七种等温吸附模型对二元体系的平衡数据进行了拟合。基于均方误差，Langmuir-Freundlich 等温吸附模型对二元吸附数据拟合最好。通过比较单组分和二元等温吸附曲线，分析了额外阳离子对 Cd(2+)和 Zn(2+)生物吸附行为的影响。结果表明，Zn(2+)对 Cd(2+)的生物吸附有显著影响，但 Cd(2+)对 Zn(2+)吸附的干扰要小得多。
