Exploring the relationship between Th(IV) adsorption and the structure alteration of phlogopite
Exploring the relationship between Th(IV) adsorption and the structure alteration of phlogopite
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探讨Th(IV)吸附与金云母结构变化的关系
DOI：
10.1016/j.clay.2017.11.026
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发表时间：
2018-02
影响因子：
5.6
通讯作者：
Wangsuo Wu
中科院分区：
文献类型：
--
作者：
Hanyu Wu;Shirong Qiang;Qiaohui Fan;Xiaolan Zhao;Peng Liu;Ping Li;Jianjun Liang;Wangsuo Wu
本研究以金云母为研究对象，利用间歇萃取、光谱分析等方法，探讨其对Th（IV）的吸附及结构转变。批实验表明，离子交换，表面络合，沉淀是占主导地位的Th（IV）吸附金云母在所观察到的pH范围内。XRD分析表明，金云母在吸附Th（IV）的过程中确实发生了向蛭石或蒙脱石类矿物的转化，表明Th（IV）的吸附促进了金云母的风化过程。这种风化过程可能是由于水化Th（IV）离子取代了位于层间位的K+离子的插入，并导致层间距为14 μ m的层间膨胀。较高的温度和初始Th（IV）浓度有利于结构转变，但碱金属离子的存在抑制了膨胀过程，其顺序为Rb+> K+> Na+> Li+，这与它们的水化半径和能量严格一致。富里酸（FA）在很大程度上影响了Th（IV）在金云母上的分布，从而导致了不同的Th（IV）吸附机制和金云母结构的变化过程。结果表明，金云母对Th（IV）的固定能力与其结构的变化程度呈正相关，这对了解环境中放射性核素与云母矿物的相互作用具有重要意义。
The adsorption of Th(IV) and the structural transformation of phlogopite were explored using batch, extraction, and spectroscopic approaches in this study. The batch experiments showed that ion exchange, surface complexation, and precipitation were predominant for Th(IV) adsorption on phlogopite under the observed pH ranges. XRD patterns showed that phlogopite was indeed transforming into the vermiculite- and/or montmorillonite-like minerals during Th(IV) adsorption, which indicated that the adsorption of Th(IV) could enhance the weathering process of phlogopite. Such weathering process could be attributed to the intercalation of hydrated Th(IV) ions instead of K+ions locating at the interlayer sites, and then induced the expansion of the interlayer with a d-spacing of ~ 14 Å. Higher temperature and initial Th(IV) concentration were benefit for the structural transformation, but the presence of alkaline cations inhibited the expansion process following the order of Rb+> K+> Na+≈ Li+, which is strictly consistent with their hydrated radii and energy. Fulvic acid (FA) affected the distribution of Th(IV) on phlogopite to a large extent, which induced different adsorption mechanisms for Th(IV) and the alteration process of phlogopite structure. The results clearly showed a positively relationship between the immobilization ability for Th(IV) and alteration degree of phlogopite structure, which is very important to understand the mutual interaction of radionuclides and micaceous minerals in the environment.
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影响因子：
6.1
作者：
R. Martín;D. M. Sánchez;A. Gutiérrez
通讯作者：
R. Martín;D. M. Sánchez;A. Gutiérrez
影响因子：
5.6
作者：
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通讯作者：
S. A. Stout;Yunchul Cho;S. Komarneni
DOI：
10.4236/csta.2013.22010
发表时间：
2013-06
期刊：
--
影响因子：
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作者：
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通讯作者：
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DOI：
10.1021/la503992p
发表时间：
2014-12
期刊：
Langmuir : the ACS journal of surfaces and colloids
影响因子：
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作者：
R. Motokawa;H. Endo;S. Yokoyama;H. Ogawa;Tohru Kobayashi;Shin'ichi Suzuki;T. Yaita
通讯作者：
R. Motokawa;H. Endo;S. Yokoyama;H. Ogawa;Tohru Kobayashi;Shin'ichi Suzuki;T. Yaita
影响因子：
5
作者：
J. Larimer;E. Anders
通讯作者：
J. Larimer;E. Anders