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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >FTIR investigation of CTAB-Al-montmorillonite complexes
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FTIR investigation of CTAB-Al-montmorillonite complexes

机译：FTIR研究CTAB-Al-蒙脱土配合物

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In this study, CTAB-Al-montmorillonite complexes were synthesized by pre-modifying montmorillonite using different concentrations of surfactant (resulting in different surfactant loadings and basal spacings), then pillaring the organoclays with hydroxy-Al cations. The resultant inorganic-organic montmorillonite complexes were characterized using FTIR, with a combination of XRD, TG and chemical analysis. This study indicates that the basal spacings of the CTAB-Al-montmorillonite complexes and the amounts of Al-contained pillars strongly depend on the surfactant loadings in the clay interlayer space, resulted from the mobility variation of the intercalated surfactants. During pillaring hydroxy-Al cations into clay interlayer space, part of the intercalated surfactants were removed, resulting in a decrease of the ordering of alkyl chains and the frequency shifts of Si(Al)-O, Si-O-Al and (M-O)(Td) stretching vibrations. The hydrophobicity of the CTAB-Al-montmorillonite complex also strongly depends on the surfactant loading whereas that of the CTAB-Al-montmorillonite complex is relative lower than that of the corresponding organoclay, indicated by the frequency shift of the vibrations corresponding to the sorbed water and their contents estimated by TG curves. With the decrease of the sorbed water content, the frequency of the band of H-O-H bending (v(2)) shifts to higher frequency while the O-H stretching vibration (v(1) and v(3)) shifts to lower frequency, indicating that H2O is less hydrogen bonded. Meanwhile, the ordered conformations of the alkyl chains in CTAB-Al-montmorillonite complex decrease when compared with that of the corresponding organoclay. (C) 2006 Elsevier B.V. All rights reserved.
机译：在这项研究中，通过使用不同浓度的表面活性剂（导致不同的表面活性剂负载量和基础间距）对蒙脱土进行预改性，然后用羟基铝阳离子作为有机粘土的基体，从而合成了CTAB-Al-蒙脱土复合物。结合XRD，TG和化学分析，使用FTIR对所得的无机-有机蒙脱土配合物进行表征。这项研究表明，CTAB-Al-蒙脱土配合物的基础间距和含Al柱的数量在很大程度上取决于插层表面活性剂的迁移率变化而导致的粘土层间空间中表面活性剂的负载。在将羟基-Al阳离子置入粘土夹层空间的过程中，部分嵌入的表面活性剂被去除，导致烷基链的有序化以及Si（Al）-O，Si-O-Al和（MO）的频移降低（TD）伸展振动。 CTAB-Al-蒙脱土配合物的疏水性也强烈取决于表面活性剂的负载量，而CTAB-Al-蒙脱土配合物的疏水性相对低于相应的有机粘土的疏水性，这由与吸附水相对应的振动的频移表明并用TG曲线估算其含量。随着吸附水含量的降低，HOH弯曲带的频率（v（2））移至较高的频率，而OH拉伸振动（v（1）和v（3））移至较低的频率，表明H 2 O与氢键较少。同时，与相应的有机粘土相比，CTAB-Al-蒙脱石络合物中烷基链的有序构象降低。 （C）2006 Elsevier B.V.保留所有权利。

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