烷基咪唑离子液体插层高岭石的制备与表征

Synthesis of kaolinite intercalated with alkyl imidazolium ionic liquids and characterization

为研究离子液体插层高岭石复合材料的性能,利用三步插层法合成离子液体1-乙基-3-甲基咪唑溴盐/高岭石(K-[Emim]Br)、1-丁基-3-甲基咪唑溴盐/高岭石(K-[Bmim]Br),采用X射线衍射(XRD)、红外光谱(FTIR)、差热分析法(TG-DSC)、扫描电镜(SEM)及紫外吸收光谱(UV)等技术对产物进行表征.结果表明:离子液体分子已经进入到高岭石层间,将片层撑开,增大了层间距,说明其插层成功;离子液体与高岭石内表面羟基形成氢键;离子液体插层后,高岭石的脱羟基温度由492℃分别上升到501和494℃,热稳定性能得到提升;插层复合物的形貌较原始高岭石有了明显改变;复合物在紫外区域具有良好的紫外吸收性能.

To investigate the properties of ionic liquids intercalated kaolinite composites,the 1-ethyl-3-methyl imidazolium bromide / kaolinite（ K-[Emim]Br）,1-butyl-3-methyl imidazo-lium bromide / kaolinite（ K-[Bmim]Br）are synthesized by a novel three-steps method. X-ray diffraction（ XRD）,Thermogravimetric-differential thermal analysis（ TG-DSC）,Infrared spectroscopy（ IR）,Scan electronic microscopy（ SEM） and Ultraviolet（ UV） are used to characterize its structure and properties. The results showed that the ionic liquid molecules successfully entered into between kaolinite layers,and the layers are propped up with increasing layer spacing of lamellar layers,indicating a successful intercalation;. The FTIR spectra suggests that ionic liquids and surface hydroxyls of kaolinite formed hydrogen bonds. The TG-DSC results showed that kaolinite got a better thermal stability due to the increase of the dehydroxylation temperature from 492 ℃ to 501 ℃ and 494 ℃,respectively. The morphology of products changed obviously compared to the primary kaolinite. The as-prepared compounds show a strong UV absorption properties.