作　　者： ; ; ; ; ; ;

机构地区： 华南理工大学化学与化工学院

出　　处： 《分析化学》 2007年第2期216-220,共5页

摘　　要： 首次以新型的纳米银掺杂炭气凝胶为材料,制备了一种新型纳米银炭电极,并考察了该电极对卤素离子的电化学响应。在0.1 mol/L的KNO3中,用微分脉冲伏安法对含Cl-的溶液以及卤素离子共存时的溶液进行测定,结果表明:峰电流与Cl-浓度呈线性关系,线性范围为2.0×10-7-4.2×10-5mol/L;检出限为1.2×10-8mol/L。此外响应电流与Cl-、Br-、I-3种离子的总浓度在6.0×10-7-1.2×10-5mol/L范围内呈线性关系。结果表明,纳米银掺杂炭气凝胶修饰电极可望用于痕量卤素离子的测定。 A novel nanosilver carbon aerogel modified electrode made from the material nanosilver carbon aerogel is first described. The electrochemical properties of this material and the response at the different media were investigated by the techniques of electrochemistry. Cyclic voltammetry showed the response at 0. 1 mol/L KNO3 solution was sensitive. The oxidation of nanosilver occurs at a potential of about 440 mV, and the oxidation peak potential move to 220 mV in the solution containing chlorine ion. The response of haloid ion determined by the modified electrode was also studied. The differential pulse vohammerty （DPV） showed that peak currunt versus concentration of chlorine ion had linear dynamic rang from 2.0 × 10 ^-7-4.2 ×10 ^-5 mol/L with a detection limit of 1.2 ×10 ^-8 mol/L. When three halide ions coexisted, the peak current versus the total concentration of three ions had the linear range of 6.0 × 10^-7 - 1.2 × 10^-5 mol/L. The new nanosilver modified electrode is potential to be used as a sensor of measuring halide ion.

关 键 词： 纳米银 炭气凝胶 修饰电极 卤素离子

领　　域： [理学] [理学]