邻硝基苯酚在溴化1-乙基-3-甲基咪唑离子液体中的电化学行为研究  

Electrochemical study of o-nitrophenol in 1-ethyl-3-methyllimidazolium bromide ionic liquid

作　　者：杨许召[1] 王军[1] 李刚森[1] 张真真[1] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450002

出　　处：《郑州轻工业学院学报（自然科学版）》2009年第1期42-45,共4页Journal of Zhengzhou University of Light Industry:Natural Science

基　　金：河南省高校杰出科研人才创新工程项目(2004KYCX010);郑州市科技攻关项目(074SCCG23109-6)

摘　　要：采用离子液体溴化1-乙基-3-甲基咪唑为反应介质,在以玻碳为工作电极、铂为辅助电极、饱和甘汞电极为参比电极的三电极体系中,采用循环伏安法研究了邻硝基苯酚的电化学行为.结果表明:随着扫描速度的加快,反应的峰电流增大,峰电位发生负移,表明反应过程是不可逆的;随着温度升高,峰电流增大,峰电位正移,并且峰电流温度系数<2%,说明反应不是由电化学过程控制的;随着底物浓度的增大,反应速度随之加快,峰电流增大,还原峰电位负移;用计时电量法得到的扩散系数D=7.385×10-7cm2.s-1.The electrochemical behavior of o-nitrophenol on glasssy carbon electrode was investigated in [ EMIM ] Br by using Pt as auxiliary electrode, saturated calomel electrode as reference electrode. The results showed that the peak current was observed to increase and the peak voltage shifted to negative as the scan rate increased, which proved that the reaction was irreversible. The peak current was observed to increase and the peak voltage shifted to positive as the temperature increased, and the temperature coefficient of the peak current was less than 2%, which proved that the reactions were not controlled by electrochemical step. The peak current was observed to increase and the peak voltage shifted to negative as the concentration increased. The diffusion coefficient of o-nitrophenol in [EMIM]Br was 7. 385 × 10^-7 cm^2 ·s^-1.

关 键 词：邻硝基苯酚 电化学行为 溴化1-乙基-3-甲基咪唑 循环伏安法 计时电量法 

分 类 号：TM912[电气工程—电力电子与电力传动] O657.1[理学—分析化学]