Interaction of rare earth elements with a brown marine alga in multi-component solutions
Interaction of rare earth elements with a brown marine alga in multi-component solutions
复制标题
DOI：
10.1016/j.desal.2010.07.030
复制
发表时间：
2011-01-15
期刊：
影响因子：
9.9
通讯作者：
Balasubramanian, R.
中科院分区：
文献类型：
--
作者：
Vijayaraghavan, K.;Sathishkumar, M.;Balasubramanian, R.
本研究阐明了镧系元素（镧，铈，铕和镱）与棕色海洋生物相互作用的基本机制。第四纪混合物中的圆锥喇叭藻。镧系元素竞争T. conoides被清楚地鉴定，这是由于竞争性离子交换机制。这种竞争影响了T.圆锥体朝向每个镧系元素。与单一镧系元素体系相比，四元体系对La、Ce、Eu和Yb的吸收容量分别降低了75.8%、72.5%、65.0%和70.2%。通过SEM/EDX和pH边缘数据证实了生物吸附机制。这意味着当处女T.将圆锥体暴露于镧系元素溶液。La 3+阳离子可以通过离子交换机制取代细胞壁中天然存在的一些碱金属和碱土金属;在所研究的条件下，这种现象在pH 5时是有利的。四元生物吸附等温线成功地模拟使用扩展的Langmuir模型与恒定的相互作用因子。模型预测与实验数据吻合良好。铕竞争镧系元素的幅度是显着的，产生了最低的相互作用因子（η = 0.91）的铕超过其他镧系元素。生物吸附动力学表明，91%以上的吸附过程在60 min内完成，然后在3 h左右缓慢达到平衡。用0.05 M HCl解吸是成功的，并且藻类生物质被重复使用三个循环而没有显著损失原始镧系元素吸收能力。(C)2010爱思唯尔有限公司版权所有。
The present study elucidates the underlying mechanisms involved in the interaction of lanthanides (lanthanum, cerium, europium and ytterbium) with a brown marine alga. Turbinaria conoides in quaternary mixtures. Competition between the lanthanides in occupying the binding sites of T. conoides was clearly identified, which was due to competitive ion-exchange mechanism. This competition affected the affinity of T. conoides towards each lanthanide. In comparison to single-component lanthanide system, uptake capacities in quaternary systems decreased by 75.8, 72.5, 65.0 and 70.2% for La, Ce, Eu and Yb, respectively. Biosorption mechanism was confirmed through SEM/EDX and pH-edge data. which implies that when virgin T. conoides are exposed to lanthanide solutions. La3+ cations may replace some of the alkali and alkaline earth metals naturally present in the cell wall through ion-exchange mechanism; and this phenomenon was favored at pH 5, under examined conditions. Quaternary biosorption isotherms were successfully modeled using the extended Langmuir model with a constant interaction factor. The model predictions agreed well with the experimental data. The magnitude of Eu competition over lanthanides was significant, yielding a lowest interaction factor (eta = 0.91) for Eu over other lanthanides. Biosorption kinetics revealed that more than 91% of sorption process was completed within 60 min for all lanthanides, followed by slow attainment of equilibrium in around 3 h. Desorption was successful with 0.05 M HCl and the algal biomass was reused for three cycles without significant loss in original lanthanide uptake capacity. (C) 2010 Elsevier B.V. All rights reserved.