Uptake Equilibria and Mechanisms of Heavy Metal Ions on Microporous Titanosilicate ETS-10
Uptake Equilibria and Mechanisms of Heavy Metal Ions on Microporous Titanosilicate ETS-10
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DOI：
10.1021/ie0498044
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发表时间：
2004-10
影响因子：
4.2
通讯作者：
L. Lv;G. Tsoi;X. Zhao
中科院分区：
文献类型：
--
作者：
L. Lv;G. Tsoi;X. Zhao
本研究尝试了在批量系统中存在和不存在不同浓度背景电解质 NaNO3 的情况下，微孔钛硅酸盐 ETS-10 上重金属离子 Pb(II)、Cu(II)、Cd(II) 和 Zn(II) 的吸收平衡和机制。研究发现，金属的吸收特性与 ETS-10 的 zeta (ζ) 电位分布以及重金属在水解、水合离子半径和水合能方面的特性有关。由于Na+和质子的竞争以及ETS-10吸附剂表面电化学性质的变化，观察到NaNO3的离子强度和pH对平衡吸收能力有显着影响。抗衡离子的解吸数据表明，离子交换主要负责重金属 Cu(II)、Cd(II) 和 Zn(II) 的吸收，而在 ETS-10 固体上吸收 Pb(II) 的情况下，除了离子交换之外，吸附和络合等其他机制也可能起到协同作用。
In this study, the uptake equilibria and mechanisms of heavy metal ions Pb(II), Cu(II), Cd(II), and Zn(II) on microporous titanosilicate ETS-10 were attempted in the absence and presence of background electrolyte NaNO3 of different concentrations in batch systems. The uptake properties of the metals were found to be related to the zeta (ζ) potential profile of ETS-10 and the characteristics of the heavy metals in terms of their hydrolysis, hydrated ionic radii, and hydration energies. The ionic strength of NaNO3 and the pH were observed to have a significant impact on the equilibrium uptake capacity due to the competition of Na+ and proton and the variation of surface electrochemical properties of ETS-10 adsorbent. The desorption data of counterions indicated that ion exchange is mainly responsible for the uptake of heavy metals Cu(II), Cd(II), and Zn(II), while other mechanisms such as adsorption and complexation may be cooperative in addition to ion exchange in the case of Pb(II) uptake on ETS-10 solid.