高等学校化学学报 ›› 2002, Vol. 23 ›› Issue (10): 1948.

• 研究论文 • 上一篇    下一篇

高岭石/甲酰胺插层的Raman和DRIFT光谱

王林江1,2, 吴大清1, 袁鹏1, 林种玉3, 刁桂仪1, 彭金莲1   

  1. 1. 中国科学院广州地球化学研究所, 广州 510640;
    2. 厦门大学固体表面物理化学重点实验室;
    3. 厦门大学化学化工学院, 厦门 361005
  • 收稿日期:2001-08-23 出版日期:2002-10-24 发布日期:2002-10-24
  • 通讯作者: 吴大清(1941年出生),男,研究员,博士生导师,主要从事矿物表面物理化学、矿物合成和矿物材料学研究.E-mail:daqingw u@gig.ac.cn E-mail:daqingw u@gig.ac.cn
  • 基金资助:

    国家自然科学基金(批准号:40072014);广东省自然科学基金(批准号:010496);厦门大学固体表面物理化学国家重点实验室开放基金(批准号:9911)资助

Raman and DRIFT Spectra of Kaolinite/Formamide Intercalation Compound

WANG Lin-Jiang1,2, WU Da-Qing1, YUAN Peng1, LIN Zhong-Yu3, DIAO Gui-Yi1, PENG Jin-Lian1   

  1. 1. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;
    2. State Key Laboratory for Physical Chemistry of Solid Surfaces;
    3. College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
  • Received:2001-08-23 Online:2002-10-24 Published:2002-10-24

摘要: 用Raman和漫反射红外光谱研究高岭石/甲酰胺插层反应机理及插层作用对高岭石微结构的影响.

关键词: 高岭石, 插层复合物, Raman光谱, DRIRFT光谱

Abstract: Raman spectroscopy and diffuse reflectance infrared spectroscopy(DRIFT) techniques have been used to study kaolinite and its intercalation compound with formamide. In the hydroxyl stretching vibration region of Raman spectrum, the formamide intercalation resulted in the decrease of the intensities of kaolinite inner surface hydroxyl bands at 3 699, 3 682, 3 665 and 3 642 cm-1, and the appearance of additional bands at 3 610, 3 628 cm-1. The two additional bands are attributed to the inner surface hydroxyls which formed hydrogen bond with the formamide C=O group. In the low frequency region of Raman spectrum, the ν1(A1g) mode of kaolinite Al(O,OH)6 octahedra consists of two bands at 180 and 193 cm-1, which shift to a high frequency and become a single band centred at 201 cm-1 after intercalation. It shows that the intercalation process decreases structural difference among the inner surface hydroxyls and makes them have a same orentation. The fact that the Raman active bands at 3 628 and 3 610 cm-1 were not observed in the DRIFT spectrum shows that the C=O group is linearly linked with the inner surface hydroxyls and that the vibration group is highly symmetric. In the NH stretching region of DRIFT spectrum, there were two bands at 3 336 and 3 466 cm-1 corresponding to the two types of the hydrogen bonds between formamide NH group and kaolinite. In the carboxyl stretching region, an additional band at 1 667 cm-1 is assigned to C=O group that bonded to the inner surface hydroxyl of kaolinite. The formamide intercalation induces that the inner hydroxyl Al-OH vibration band 930 cm-1 shift to high frequency 933 cm-1, which is due to that the formamide NH group was keyed into the ditrigonal hole of kaolinite. The formamide intercalation not only resulted in the breaking of the hydrogen bonds between the Al(O,OH)6 octahedral hydroxyl groups and the SiO4 tetrahedral oxygens, but also the formation of new different type hydrogen bonds between formamide molecule and kaolinite inner surface hydroxyl and the SiO4 tetrahedral oxygen.

Key words: Kaolinite, Intercalation compound, Raman spectrum, DRIFT spectrum

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