纳米银-多壁碳纳米管修饰玻碳电极用于微分脉冲伏安法测定水中氯离子  

Use of Nano Ag/MWCNT's/GCE in the Differential Pulse Voltammetric Determination of Chloride Ion in Water

作　　者：杨平华[1] 陈小艳[1] 

机构地区：[1]九江学院化学化工学院,九江332005

出　　处：《理化检验（化学分册）》2011年第3期323-326,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：江西省教育厅科技项目(GJJ09352)

摘　　要：用化学镀方法制备了纳米银覆盖多壁碳纳米管的复合材料,将其分散在水中配成1.0g·L^(-1)的悬浮液并滴涂在玻碳电极表面,制得纳米银-多壁碳纳米管修饰电极(nano Ag/MWCNT's/GCE)。用循环伏安法研究了在pH 6.0的磷酸盐支持电解质中,在—0.60～1.0V(vs.SCE)电位范围内,氯离子在nano Ag/MWCNT's/GCE上的电化学行为,结果表明:在氮气氛围中,修饰电极的氧化峰和还原峰分别位于0.19V和—0.20V电位处;随着氯离子浓度的增加,修饰电极的氧化峰电流降低,氯离子浓度在8.0×10^(-3)～0.1mol·L^(-1)之间与微分脉冲氧化峰电流的降低值呈线性关系。提出了用微分脉冲伏安法测定氯离子的方法,修饰电极用于自来水中氯离子的测定,回收率在98.5%～100.3%之间。Composite of nano-silver coated multi-wall carbon nanotubes （nano Ag/MWCNTts） was prepared by chemical plating, and nano Ag/MWCNT＇s modified GCE was prepared by adding dropwice a 1. 0 g· L^-1 suspensition of nano Ag/MWCNT＇s in water onto surface of GCE （designated as nano Ag/MWCNT＇ s/GCE）. Electrochemical behavior of chloride ion at the modified electrode was studied by cyclic vohammetry in a phosphate buffer supporting electrolyte of pH 6. 0 in the potential range of -0. 60 V to 1.0 V （vs. SCE）. As shown by the experimental results, in nitrogen atmosphere, a pair of oxidation and reduction peaks was observed at 0. 19 V and -0. 20 V respectively. Values of oxidation peak current was decreased with the increase of chloride ion and linear relationship between the magnitude of decrease in oxidation peak current and concentration of chloride ion was obtained in the range of 8. 0×10^-3 -0. 1 mol· L^-1. Based on these findings, a method for determination of chloride ion by differential pulse vohammetry was proposed. The proposed method was used in the determination of chloride ion in water, giving values of recovery in the range of 98. 5%-100. 3%.

关 键 词：纳米银-多壁碳纳米管修饰电极 氯离子 电化学行为 

分 类 号：O657.1[理学—分析化学]