高岭石/甲酰胺插层的Raman和DRIFT光谱  

Raman and DRIFT Spectra of Kaolinite/Formamide Intercalation Compound

作　　者：王林江[1] 吴大清[1] 袁鹏[1] 林种玉[2] 刁桂仪[1] 彭金莲[1] 

机构地区：[1]中国科学院广州地球化学研究所 [2]厦门大学化学化工学院,厦门361005

出　　处：《高等学校化学学报》2002年第10期1948-1951,共4页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号 :40 0 72 0 14 );广东省自然科学基金 (批准号:0 10 496);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

摘　　要：用 Raman和漫反射红外光谱研究高岭石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 CO group. In the low frequency region of Raman spectrum, the ν 1(A 1g) 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 CO 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 CO 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 SiO 4 tetrahedral oxygens, but also the formation of new different type hydrogen bonds between formamide molecule and kaolinite inner surface hydr

关 键 词：甲酰胺 高岭石 插层复合物 RAMAN光谱 DRIRFT光谱 插层反应机理 微结构 

分 类 号：TB332[一般工业技术—材料科学与工程]