SDS-乙醇-水中[Fe(phen)_3]^(2+)介导双酚A的伏安检测  

Voltammetric Detection of Bisphenol A Mediated by [Fe( phen)_3]^(2+)in SDS- Ethanol- Water System

作　　者：朱少娇[1] 陈琳琳[1] 刘俊辰[1] 倪申妍 李红[1] 

机构地区：[1]华南师范大学化学与环境学院,广东广州510006

出　　处：《分析测试学报》2013年第12期1460-1465,共6页Journal of Instrumental Analysis

基　　金：国家自然科学基金项目(21271075);广东省自然科学基金项目(10351063101000001)

摘　　要：应用循环伏安法和微分脉冲伏安法研究了十二烷基硫酸钠(SDS)-乙醇-水体系中[Fe(phen)3]2+(phen=1,10-邻菲咯啉)介导双酚A(BPA)氧化的反应机理及其伏安检测。结果表明:在SDS-乙醇-水体系中,铟锡氧化物(ITO)电极上[Fe(phen)3]2+对BPA呈现出良好的电催化氧化活性,电催化效果受乙醇-水体积比、SDS及BPA浓度的影响。在乙醇-水(1∶5)体系中,0.25 mmol·L-1SDS的加入增强了ITO电极上[Fe(phen)3]2+对BPA的电催化氧化作用。在乙醇-水(1∶5)和0.25 mmol·L-1SDS体系中,BPA在微分脉冲伏安图上约0.731 V处有明显的电催化氧化峰,峰电流在0.2~20μmol·L-1内呈良好的线性关系(r=0.999 9),检出限为0.034μmol·L-1,相对标准偏差(n=3)为2.1%。将该体系用于水样中BPA的测定,回收率为96.9%~100.7%。该文还讨论了SDS-乙醇-水体系中[Fe(phen)3]2+介导BPA氧化的反应机理。该研究有助于更好地理解微乳体系中氧化还原媒介体对酚类污染物的电催化氧化机理,可为电化学传感器的构建提供新思路。Electrochemical oxidation mechanism and voltammetric detection of bisphenol A（ BPA） mediated by [Fe（ phen） 3 ]2 ＋（ phen =1,10-phenanthroline） on an indium-tin oxide（ ITO） electrode in sodium dodecylsulfate（ SDS）- ethanol- water systems were investigated by means of cyclic voltammetry and differential pulse voltammetry. [Fe（ phen） 3 ]2 ＋showed a good electrocatalytic activity for BPA oxidation,depending on ethanol-to-water volume ratio,SDS and BPA concentrations. In the ethanolwater（1∶5） system,the addition of 0. 25 mmol·L- 1SDS could facilitate the electrocatalytic oxidation of BPA by [Fe（ phen） 3 ]2 ＋on the ITO electrode. In the ethanol-water（ 1 ∶ 5） system containing 0. 25 mmol·L- 1SDS,a significant electrocatalytic oxidation peak at ca. 0. 731 V was observed in the DPV curve,and its peak currents were linear for BPA concentration in the range of 0. 2- 20 μmol·L- 1（ r =0. 999 9）. The detection limit（ S/N =3） of BPA is 0. 034 μmol·L- 1 and the relative standard deviation（ RSD,n = 3） is 2. 1%. The proposed method was successfully used to analyze BPA in water samples with recoveries of 96. 9%- 100. 7%. The electrochemical oxidation mechanism of BPA mediated by [Fe（ phen） 3 ]2 ＋in the SDS- ethanol- water system was also discussed. This study not only helps us better understand the electrocatalytic oxidation mechanisms of phenolic pollutants by redox mediators in microemulsion systems,but also provides a new idea for the fabrication of electrochemical sensors.

关 键 词：双酚A 多吡啶铁(Ⅱ)配合物 电催化氧化 电化学检测 

分 类 号：O657.1[理学—分析化学] O625.31[理学—化学]