电化学方法监测氯化胆碱离子液体-乙醇胺混合吸收液吸收CO2  

Electrochemical Monitoring of CO2 Absorption in a Choline Chloride Based Ionic Liquids-Ethanolamine Mixed Absorbent

作　　者：黄青 胡杨 戴伟 曾国平 李杰 吴田 HUANG Qing;HU Yang;DAI Wei;ZENG Guoping;LI Jie;WU Tian(Institute of Materials Research and Engineering(IMRE),College of Chemistry and Life Science,Hubei University of Education,Wuhan 430205;College of Chemistry and Molecular Sciences,Wuhan University,Wuhan 430072;Hubei Environmental Purification Materials Engineering Technology Research Center,Wuhan 430205)

机构地区：[1]湖北第二师范学院材料科学研究院,化学与生命科学学院,湖北武汉430205 [2]武汉大学化学与分子科学学院,湖北武汉430072 [3]湖北省环境净化材料工程技术研究中心,湖北武汉430205

出　　处：《分析科学学报》2020年第3期359-363,共5页Journal of Analytical Science

基　　金：湖北省自然科学基金(No.2018CFC827);湖北省高校优秀青年科技创新团队项目(No.T201620)。

摘　　要：合成了氯化胆碱-乙二醇离子液体,研究了该离子液体与乙醇胺混合吸收液(摩尔比6∶1)吸收CO2性能及解吸行为。该离子液体加入乙醇胺后对CO2吸收极为迅速且具有较大吸收容量,并通过循环伏安方法监测吸收产物质子化乙醇胺(MEAH+)的电化学行为。真空条件(80℃,10-5 atm)下解吸后的MEAH+的循环伏安行为表明,该条件下可实现离子液体的回收利用。通过测定液相中MEAH+浓度变化来研究吸收的方法,不仅有利于研究吸收过程中的反应机理,而且具有测定速度快,测控便捷等特点。The choline chloride based ionic liquids have the advantages such as extremely low volatility,electrochemical stability, easy preparation at low cost, and are more suitable for large-scale applications. In this paper, choline chloride-ethylene glycol(ChCl-EG) ionic liquids were synthesized and mixed with MEA(6∶1 in molar ratio) to study adsorption properties and desorption behaviors of CO2. Addition of MEA into ChCl-EG significantly increased the CO2 absorption capacity and acquired the electrochemical response of MEAH+. The ChCl-EG-MEA electrolyte was saturated with CO2, and then cyclic voltammetric signals were recorded after vacuum heating(80 ℃, 10-5 atm). The results showed that the solution could be recycled in this condition. By measuring the concentration change of MEAH+ in liquid phase, the method could be used to study the reaction mechanism in the absorption process with the advantages of fast determination and convenient control.

关 键 词：氯化胆碱-乙二醇低共融溶剂 二氧化碳 乙醇胺 循环伏安 

分 类 号：O657.1[理学—分析化学]