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首页> 外文期刊>Electroanalysis >Electrochemical quantification of hygroscopicity of ionic liquids with solution-dissolved potassium ferricyanide as the redox probe
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Electrochemical quantification of hygroscopicity of ionic liquids with solution-dissolved potassium ferricyanide as the redox probe

机译：以溶液溶解的铁氰化钾为氧化还原探针对离子液体的吸湿性进行电化学定量

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Quantification of hygroscopicity of ionic liquids (ILs) is of great importance in both fundamental studies and practical applications of ILs. This study demonstrates an electrochemical method for effectively quantifying the hygroscopicity of ILs through electrochemically monitoring water contents absorbed into ILs. The measurements of water content absorbed into the ILs are performed with square wave voltammetry (SWV) based on the water-induced enhancement of diffusion of solution-dissolved potassium ferricyanide (K_3Fe(CN)_6) redox probe. For demonstration, two kinds of ILs with different hygroscopicity (i.e., hydrophilic Bmim~+Gly~- and hydrophobic Bmim~+PF_6~-) are employed in this study. The dissolution of K_3Fe(CN)_6 redox probe into ILs is found to have little effect on the hygroscopicity of ILs. The hygroscopicity of ILs is thus able to be quantified by monitoring water content absorbed into ILs as a function of time when ILs are stored at room temperature and standard atmospheric pressure under 55% relative humidity (RH). Under the conditions employed in this study, the hygroscopicity of Bmim~+Gly~- and Bmim~+PF_6~- is determined to be 1.33M per hour and 0.05M per hour, respectively, which are almost consistent with those measured with Karl Fischer titration under the same conditions. The electrochemical method demonstrated in this study is experimentally simply and environmentally benign and may be potentially extended for general quantification of hygroscopicity of ILs.
机译：离子液体（IL）吸湿性的定量在IL的基础研究和实际应用中都非常重要。这项研究表明了一种电化学方法，可通过电化学监测吸收到ILs中的水分来有效地定量ILs的吸湿性。基于水诱导的溶液溶解的铁氰化钾（K_3Fe（CN）_6）氧化还原探针的扩散引起的水扩散，使用方波伏安法（SWV）进行IL中吸收水含量的测量。为了证明这一点，在本研究中使用了两种具有不同吸湿性的IL（即亲水性Bmim〜+ Gly〜-和疏水性Bmim〜+ PF_6〜-）。发现K_3Fe（CN）_6氧化还原探针溶解到IL中对IL的吸湿性影响很小。因此，当将IL储存在室温和标准大气压下，相对湿度（RH）为55％的情况下，可以通过监测IL吸收的水分随时间的变化来量化IL的吸湿性。在本研究中使用的条件下，Bmim〜+ Gly〜-和Bmim〜+ PF_6〜-的吸湿性分别确定为每小时1.33M和每小时0.05M，这与用Karl Fischer测得的吸湿性几乎一致在相同条件下滴定。在这项研究中证明的电化学方法在实验上是简单的且在环境上是良性的，并且可能被扩展用于IL的吸湿性的一般量化。

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