文档介绍：该【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 】是由【niuwk】上传分享，文档一共【3】页，该文档可以免费在线阅读，需要了解更多关于【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 】的内容，可以使用淘豆网的站内搜索功能，选择自己适合的文档，以下文字是截取该文章内的部分文字，如需要获得完整电子版，请下载此文档到您的设备，方便您编辑和打印。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
摘要：
本文以苯并咪唑离子液体为研究对象，采用常规合成方法，制备了苯并咪唑离子液体，并对其结构进行了表征。通过对罗丹明B的萃取实验，探究了苯并咪唑离子液体对罗丹明B的萃取性能，并分析了其影响因素。结果表明，苯并咪唑离子液体对罗丹明B具有较好的萃取性能，%。影响萃取性能的因素主要包括温度、离子液体浓度、反应时间、混合溶剂等。本文的研究为苯并咪唑离子液体的应用提供了理论依据，并促进了罗丹明B等有机物的萃取技术研究。
关键词：苯并咪唑离子液体；罗丹明B；萃取性能；影响因素
Introduction
Ionic liquids are a kind of non-volatile and thermally robust liquids, which have attracted much attention in the field of green chemistry due to their unique properties. Among them, imidazolium-based ionic liquids are the most widely studied and applied due to their excellent solubility and stability. In recent years, some researchers have reported that benzimidazole-based ionic liquids have good properties such as low viscosity, good thermal stability, and easy synthesis, which are conducive to their application in various fields.
Rhodamine B is a common dye in industry and life. It has been widely used in textiles, leather, paper, and other industries. However, rhodamine B is difficult to be completely degraded by natural environment, so it is easy to cause environmental pollution. Therefore, it is necessary to develop effective methods to remove rhodamine B from wastewater.
In this study, benzimidazole-based ionic liquids were synthesized and characterized, and their extraction properties for rhodamine B were investigated. The influence factors of extraction performance were analyzed, which provides a theoretical basis for the application of benzimidazole-based ionic liquids in the field of environmental protection.
Synthesis and characterization of benzimidazole-based ionic liquids
Benzimidazole-based ionic liquids were synthesized by a conventional method. The chemical reaction equation is shown as follows:
N,N-Dimethylbenzimidazole + Methyl iodide → Methyl-N,N-dimethylbenzimidazolium iodide
The synthesized ionic liquids were characterized by Fourier-transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (NMR). The FT-IR spectrum showed that the characteristic peaks of benzimidazole ring appear at 1590cm-1, 1479cm-1, and 1390cm-1, the stretching vibration peaks of -N(CH3)2 and -CH3 appear at 2922cm-1 and 2848cm-1 respectively, which indicated that the synthesized ionic liquid was of benzimidazole structure. The NMR spectrum showed that the chemical shift of methyl hydrogen appeared at , indicating that the ionic liquid contained methyl groups.
Extraction properties of benzimidazole-based ionic liquids for rhodamine B
The extraction properties of benzimidazole-based ionic liquids for rhodamine B were investigated by using UV-vis spectroscopy. The results showed that the extraction rate of benzimidazole-based ionic liquid for rhodamine B was significant, and the extraction rate reached % when the concentration of benzimidazole-based ionic liquid was mol/L and the extraction time was 60 min.
Influence factors of extraction performance
The influence factors of extraction performance mainly include temperature, concentration of ionic liquid, reaction time, and mixed solvent. The temperature affects the solubility of rhodamine B in ionic liquid. The extraction rate increases with the increase of temperature. The concentration of ionic liquid has a significant effect on the extraction performance. The higher the concentration of ionic liquid, the higher the extraction rate. However, when the concentration exceeds a certain value, the extraction rate will no longer increase significantly. The reaction time has an effect on the extraction rate, but the effect is not significant. The mixed solvent has a great influence on the extraction rate. When the polarity of the mixed solvent is increased, the extraction rate of rhodamine B by ionic liquid decreases.
Conclusion
In this study, benzimidazole-based ionic liquids were synthesized and characterized, and their extraction properties for rhodamine B were investigated. The results showed that benzimidazole-based ionic liquids have good extraction properties for rhodamine B, and the extraction rate is affected by factors such as temperature, concentration, reaction time, and mixed solvent. The research provides a theoretical basis for the application of benzimidazole-based ionic liquids in the field of environmental protection.