PdNPs/MWNTs修饰玻碳电极的制备及其对六价铬的电化学测定

用钯纳米粒子多壁碳纳米管修饰玻碳电极,并用于对六价铬(Cr(VI))的电化学测定.采用场发射扫描电子显微镜、循环伏安法、交流阻抗法、差分脉冲伏安法等方法对修饰电极进行了表征.研究发现多种其他金属离子如Cr3+、Pd2+、Zn2+、Pb2+、Cu2+、Al3+、Ba2+、Ca2+、Mg2+等对六价铬离子的测定没有明显干扰,且六价铬的还原峰电流与Cr(VI)的浓度在8×10-7~5×10-8mol/L范围内呈良好线性关系,检测限达2.7×10-8mol/L.该法具有简便快速,选择性好,灵敏度高等特点.

Preparation of palladium nanoparticles and carboxylated MWNTs modified glassy carbon electrode and its application for the electrochemical determination of Cr (VI)

This study described a simple and rapid method for the electrochemical determination of Cr （VI） based on palladium nanoparticles and carboxylated multi-walled carbon nanotubes （MWNTs） modified glassy carbon electrode （GCE） （written as PdNPs-MWNT/GCE） . The prepared PdNPs-MWNT/GCE was characterized by FE-SEM, CV,EIS and DPV. It was found that many other metal ions such as Cr3 ＋ ,Pd2＋ , Zn2＋ , Pb2＋ , Cu2＋ , A13＋ , Ba2＋ , Ca2＋ , Mg2＋ had no influence on Cr （VI） determina- tion. Under the optima/conditions, the reduction current of Cr （ VI ） increased linearly with increasing the concentration of Cr （VI） in the range of 8 × 10^-7 ~ 5 ×10^-8 mol/L with a correlation coefficient of 0. 9960 ,and the detection limit of 3 ×10^-8mol/L （ based on SIN = 3 ）. The present method has the following advantages such as simple, rapid,good selectivity and sensitivity.