苯并咪唑离子液体的合成及其对罗丹明B萃取性能的研究

Synthesis of Benzimidazolium-based Ionic Liquids and Study on Their Extractive Performance for Rhodamine B from Water

离子液体可以通过结构设计实现特定的功能。本研究针对染料具有共轭体系的结构特点,从增强离子液体与染料的相互作用入手,设计合成了三种疏水性苯并咪唑类离子液体。利用IR、MS和1H NMR对其结构进行了表征。利用这三种离子液体对罗丹明B进行萃取,探究了萃取时间、温度、罗丹明浓度、p H值等因素对萃取效果的影响。其中5-硝基-1-丁基苯并咪唑六氟磷酸盐的萃取效果最好。通过与咪唑基离子液体对比,苯并咪唑类离子液体对罗丹明B的萃取性能更优。

The cation and anion of ionic liquid can be modified to have specific chemical and physical properties. To enhance the interaction between ionic liquids （ILs ） and dyes which with conjugate structures, three new hydrophobic benzimidazolium-based ionic liquids were designed and synthesized. The structures were confirmed by IR, MS and 1 H NMR. The extraction performance of the ILs for rhodamine B from water was tested, and the impact extraction by extraction time, temperature, concentration of rhadamine B and pH were studied. The extraction of rhodamine B with 1-butyl-5-nitro-benzimidazolium hexafluorophosphate was best. By comparing benzimidazolium-based IL with homologous imidazolium-based IL, it was found that the extraction performance of benzimidazolium-based IL was better.