电还原镉-壳聚糖杂化材料修饰电极的制备及表征  

Preparation and Characterization of Electrochemically Reduced Cadmium-chitosan Hybrid Modified Electrode

作　　者：郑梅霞[1] 蔡细丽[1] 王立衡[1] 高飞[1] 薛华凌[1] 汪庆祥[1] 

机构地区：[1]漳州师范学院化学与环境科学系,福建漳州363000

出　　处：《漳州师范学院学报（自然科学版）》2012年第1期57-63,共7页Journal of ZhangZhou Teachers College（Natural Science)

基　　金：国家自然科学基金(No.20805041);福建省高校杰出青年科研人才培育计划(No.JA10201);福建省研究生教育创新基地资助项目

摘　　要：本文利用壳聚糖(CHT)对镉离子的吸附性能并结合电化学还原法在玻碳电极(GCE)表面制备了还原态镉-壳聚糖(rCd-CHT)有机-无机杂化材料.以K3Fe(CN)6为电化学活性探针对修饰电极的电化学性能进行了循环伏安(CV)和交流阻抗(EIS)表征,结果表明rCd-CHT能大大提高该修饰电极的有效表面积,增大K3Fe(CN)6在修饰电极表面的异相电子转移速率(k0).将不同修饰电极用于抗坏血酸(AA)的电化学检测,结果显示,AA在rCd-CHT/GCE上的氧化峰电流值(Ipa)较裸GCE和CHT/GCE分别增大了1.4和2.1倍,表明rCd-CHT/GCE修饰电极对AA具有良好的电催化氧化作用.In this paper, based on chemical adsorption ability of chitosan （CHT） to the cadmium ions and combined with electrochemical reduction method, cadmium-chitosan （rCd-CHT） organic-inorganic hybrid material in reduced form was electrochemically prepared on a glassy carbon electrode （rCd-CHT/GCE）. Taking K3Fe（CN）6 as the electrochemical activity probe, the characterization of modified electrode electrochemical performance was made through circulation current-voltage （CV） and exchange impedance （EIS）, and the result shows that rCd-CHT can dramatically improve the modified electrode surface area effectively and increase out-of-phase electron transfer rate （k~） of K3Fe（CN）6 in the surface of the modified electrodes. Different modified electrodes were further applied for the electrochemical detection of aseorbie acid （AA）, and it was found that the oxidation peak current value of AA （Ipa） in rCd-CHT/GCE increased respectively 1.4 and 2.1 times larger than those in bare GCE and CHT/GCE, indicating that rCd-CHT modified electrode can effectively improve the electrocatalytic oxidation on the part of AA.

关 键 词：镉 电化学还原 抗坏血酸 电催化氧化 

分 类 号：O654.9[理学—分析化学]