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PdNPs/MWNTs修饰玻碳电极的制备及其对六价铬的电化学测定
杨帅,汤婉鑫,张超,祝宁宁
作者单位
杨帅 上海师范大学 
汤婉鑫 上海师范大学 
张超 上海师范大学 
祝宁宁 上海师范大学 
摘要:
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.
关键词:  六价铬Cr(VI)  钯纳米粒子  多壁碳纳米管  电化学  修饰电极
DOI:
分类号:
基金项目:上海师范大学食品安全与营养创新团队发展计划(DXL123)
Preparation of palladium nanoparticles and carboxylated MWNTs modified glassy carbon electrode and its application for the electrochemical determination of Cr (VI)
YANG Shuai,TANG Wanxin,ZHANG Chao,ZHU Ningning
Abstract:
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+,Al3+,Ba2+,Ca2+,Mg2+ had no influence on Cr (VI) determination.Under the optimal conditions,the reduction current of Cr (VI) increased linearly with increasing the concentration of Cr (VI) in the range of 8×10-7~ 5×10-8mol/L with a correlation coefficient of 0.9960,and the detection limit of 3×10-8mol/L (based on S/N=3).The present method has the following advantages such as simple,rapid,good selectivity and sensitivity.
Key words:  Cr (VI)  PdNPs  MWNTs  electrochemical  modified electrode