烷基咪唑离子液体插层高岭石复合物的制备与表征

Preparation and characterization of kaolinite/alkylimidazole ionic liquids intercalation composites

以 K-DMSO、K-MeOH 为前驱体成功制备了 K-[Bmim]Br 和 K-[Emim]Br 烷基咪唑离子液体插层高岭石复合物.利用 X 射线衍射（XRD）、红外光谱（FT-IR）、差热分析法（TG-DSC）及扫描电镜（SEM）等技术对产物进行表征.XRD 结果显示离子液体成功进入到高岭石层间,增大了层间距,并且Δd 值随着烷基链增长而增大,同时证明经甲醇插层5~6 d 后,离子液体插层达到最佳条件.FT-IR 结果表明离子液体与高岭石内表面羟基形成氢键.TG-DSC 结果显示离子液体插层后,高岭石的脱羟基温度由490．6℃分别上升到501．5和495．5℃,热稳定性能得到提升. SEM 结果表明插层复合物的形貌较原始高岭石有了明显的改变.

K-[Emim]Br and K-[Bmim]Br were successfully prepared by using K-DMSO and K-MeOH intercalation composites as precursors.The products were characterized by X-ray diffraction(XRD),thermo gravimetric-differential scanning calorimetry(TG-DSC),Fourier transform infrared spectroscopy(FT-IR)and scanning electron microscope(SEM).The XRD results showed that the interlayer d-spacing of kaolinite increased as the result of the successful insertion of ionic liquids,and the d-spacingΔdincreased with longer alkyl chain,also concluded that methanol interacted with kaolinite for 5to 6dcould provide ionic liquids with the optimal intercalated condition.The FT-IR spectras suggested that ionic liquids formed hydrogen bonds with the inner surface hydroxyls of kaolinite.The TG-DSC results showed that kaolinite got a better thermal stability due to the increase of the dehydroxylation temperature from 490.6to 501.5and 495.5℃,respectively.The morphology of products had big changes compared with the raw kaolinite according to the SEM images.