摘要
将壳聚糖与铜盐通过配位结合制得壳聚糖-铜复合物(CTS-Cu),并用其修饰玻碳电极,使用循环伏安法和计时安培法研究了该修饰电极对H2O2的电催化性能,对其催化机理进行了探讨。优化的实验条件为:以0.1 mol/L磷酸缓冲溶液(PBS,pH 7.0)为反应介质,CTS-Cu修饰液中的铜离子浓度为6 mmol/L,工作电位为-0.20 V。在该实验条件下对H2O2进行检测,其峰电流与H2O2的浓度在3.9×10-5～1.4×10-3mol/L范围内呈良好线性,检出限为3.6×10-6 mol/L,相对标准偏差(n=5)为3.4%。实验结果表明,CTS-Cu配合物修饰电极制备简单、使用方便、灵敏度高、选择性好,对H2O2具有良好的电催化性能。
A modified electrode based on ehitosan - copper complex （ CTS - Cu） was developed for the quick determination of hydrogen peroxide（ H2O2 ）. The CTS -Cu complex was prepared via the coordination interaction of chitosan and copper（ II） salt and was used to modify glassy carbon electrode（GCE）. The electrocatalytie perforamance of the resuhing CTS- Ca modified electrode（ CTS- Cu/GCE） to H2O2 was investigated by cyclic vohammetry （CV） and chronoamperometry（CA）. The mechanism of the catalytic reaction was further discussed. The experimental conditions were optimized and listed us fellows： 0. 1 mol/L phosphate buffer solution（PBS, pH 7.0）was used as the reaction medium, the concentration of copper（ II ） in the CTS-- Cu modified solution was 6 mmol/l,, and the applied potential was - 0.20 V. Under the optimum conditions, the peak current of the modified electrode was proportional to the concentration of H202 in the range of 3.9 ×10^-5-1.4×10^-3mol/L with a detection limit of 3.6 ×10^-6mol/L. The relative standard deviation （RSD, n = 5） was 3.4%. The resuhs indicated that the preparation method was simple, and the employment of the modified electrode was also convenient. Moreover, the modified electrode has the advantages of high sensitivity, excellent electrocatalytic performance to H2O2 , and good anti-intrference ability in the determination of H2O2 with satisfactory result.
出处
《分析测试学报》
CAS
CSCD
北大核心
2011年第4期425-429,共5页
Journal of Instrumental Analysis
基金
国家自然科学基金资助项目(21005091)
广东省质量技术监督局科技项目资助(2010CZ06)
关键词
铜
壳聚糖
H2O2
修饰电极
电催化
copper
chitosan
H2O2
modified electrode
eleetrocatalysis
