Fractionation of clay colloids and their synthetic utility in vanadium hydroxide-clay thin film formation
Fractionation of clay colloids and their synthetic utility in vanadium hydroxide-clay thin film formation
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粘土胶体的分馏及其在氢氧化钒-粘土薄膜形成中的合成应用
DOI：
10.1016/j.apsusc.2019.03.083
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发表时间：
2019-07
影响因子：
6.7
通讯作者：
Henderson Mark J.
中科院分区：
文献类型：
--
作者：
Song Ping;Li Qintang;Almasy Laszlo;Tuo Xianguo;Yan Minhao;Henderson Mark J.
稳定的矿物胶体在环境中锕系元素污染物的移动中起作用。在本文中，我们提出了一种方法来分离和识别胶体释放的高表面积吸附剂与拟议的粘土矿物屏障在核废料处置库。矿物胶体，这有很强的倾向，保持分散在溶液中，从铝13-或（CesinglebondAl）柱撑粘土沉积物，吸附在玻璃上与水解钒（IV）物种和研究了各种技术，包括掠入射X射线散射（GIXS），小角X射线散射（SAXS），傅立叶变换红外光谱（FT-IR）和原子力显微镜（AFM）。我们发现，粘土片晶在连续的、透明的100 nm厚的膜中是尺寸取向的，直到钒氧化物在350 °C以上开始。有机物质和次生矿物石英限制了血小板的溶胀能力，这表明稳定的胶体来自于不能被铝阳离子插入的天然粘土的一部分。X射线散射从定向粘土膜插入铝和混合铈/铝氧代羟基阳离子的GIXS技术也进行了研究。
Stable mineral colloids play a role in the mobilization of actinide contaminants in the environment. In this paper we present a method to isolate and identify colloids released from high surface area sorbents associated with a proposed clay mineral barrier in a nuclear waste repository. The mineral colloids, which have a strong tendency to remain dispersed in solution, were separated from Al13- or (Cesingle bondAl)-pillared clay sediment, adsorbed on glass together with hydrolyzed vanadium(IV) species and studied by a variety of techniques including grazing-incidence X-ray scattering (GIXS), small-angle X-ray scattering (SAXS), Fourier transform-infrared spectroscopy (FT-IR) and atomic force microscopy (AFM). We show that the clay platelets are dimensionally orientated in the continuous, transparent 100 nm thick film until the onset of vanadium oxides above 350 °C. Organic matter and the secondary mineral quartz limit the swelling capacity of the platelets, an indication that the stable colloids originate from a part of the native clay that could not be intercalated by aluminum cations. X-ray scattering from oriented clay films intercalated by aluminum- and mixed cerium/aluminum oxo-hydroxy cations are also investigated by the GIXS technique.
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