Department of Biochemical and Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, University of São Paulo, São Paulo, SP, Brazil.
J Hazard Mater. 2012 May 30;217-218:246-55. doi: 10.1016/j.jhazmat.2012.03.022. Epub 2012 Mar 17.
Binary and ternary systems of Ni(2+), Zn(2+), and Pb(2+) were investigated at initial metal concentrations of 0.5, 1.0 and 2.0mM as competitive adsorbates using Arthrospira platensis and Chlorella vulgaris as biosorbents. The experimental results were evaluated in terms of equilibrium sorption capacity and metal removal efficiency and fitted to the multi-component Langmuir and Freundlich isotherms. The pseudo second order model of Ho and McKay described well the adsorption kinetics, and the FT-IR spectroscopy confirmed metal binding to both biomasses. Ni(2+) and Zn(2+) interference on Pb(2+) sorption was lower than the contrary, likely due to biosorbent preference to Pb. In general, the higher the total initial metal concentration, the lower the adsorption capacity. The results of this study demonstrated that dry biomass of C. vulgaris behaved as better biosorbent than A. platensis and suggest its use as an effective alternative sorbent for metal removal from wastewater.
采用螺旋藻和普通小球藻作为生物吸附剂，研究了 Ni(2+)、Zn(2+)和 Pb(2+)的二元和三元体系在初始金属浓度为 0.5、1.0 和 2.0mM 时的竞争吸附情况。根据平衡吸附容量和金属去除效率对实验结果进行了评价，并拟合了多组分 Langmuir 和 Freundlich 等温线。Ho 和 McKay 的拟二级动力学模型很好地描述了吸附动力学，傅里叶变换红外光谱（FT-IR）证实了金属与两种生物质的结合。与相反的情况相比，Ni(2+)和 Zn(2+)对 Pb(2+)吸附的干扰较小，这可能是由于生物吸附剂对 Pb 的偏好。一般来说，初始总金属浓度越高，吸附容量越低。本研究结果表明，干燥小球藻生物质的表现优于螺旋藻，可作为从废水中去除金属的有效替代生物吸附剂。
