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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
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:
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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
College of Life and Environmental Sciences,Shanghai Normal University
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