School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200072, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Aug;79(3):548-53. doi: 10.1016/j.saa.2011.03.031. Epub 2011 Apr 2.
Hydrocalumite (CaAl-LDH-Cl) belongs to layered double hydroxides (LDHs). The intercalation of Na-dodecylbenzenesulfate (SDBS) into CaAl-LDH-Cl has been investigated by X-ray diffraction (XRD), mid-infrared (MIR) spectroscopy and near-infrared (NIR) spectroscopy. The mid-infrared spectra indicated that SDBS could be intercalated into CaAl-LDH-Cl, with the same lattice structure to that of CaAl-LDH-Cl, and the interlayer distance of resultant product was expanded to 2.78 nm as confirmed by XRD. The near-infrared spectra (9200-4000 cm(-1)) showed that a special spectral range from 6200 to 5600 cm(-1) and prominent bands of CaAl-LDH-Cl intercalated with SDBS around 8300 cm(-1). This band was assigned to the second overtone of the first fundamental of C-H stretching vibrations of SDBS, and can be used to determinate the result of CaAl-LDH-Cl modified by anionic surfactants. The bands of water stretching vibrations and -OH groups shifted to higher wavenumbers when CaAl-LDH-Cl was intercalated by SDBS, and their intensity of MIR and NIR spectra became lower in intensity.
水滑石（CaAl-LDH-Cl）属于层状双氢氧化物（LDHs）。通过 X 射线衍射（XRD）、中红外（MIR）光谱和近红外（NIR）光谱研究了十二烷基苯磺酸钠（SDBS）插层进入 CaAl-LDH-Cl 的情况。中红外光谱表明 SDBS 可以插入到 CaAl-LDH-Cl 中，具有与 CaAl-LDH-Cl 相同的晶格结构，并且通过 XRD 确认产物的层间距离扩展到 2.78nm。近红外光谱（9200-4000cm-1）显示，从 6200 到 5600cm-1 的特殊光谱范围和 SDBS 插层 CaAl-LDH-Cl 的突出带约为 8300cm-1。该带被分配为 SDBS 的 C-H 伸缩振动的第一基频的第二泛频，可用于测定阴离子表面活性剂改性的 CaAl-LDH-Cl 的结果。当 CaAl-LDH-Cl 被 SDBS 插层时，水伸缩振动和-OH 基团的带移至较高的波数，并且它们的 MIR 和 NIR 光谱的强度变低。
