基于自掺杂聚苯胺/氧化石墨烯三维交联纳米墙同步检测水中Cd2+和Pb2+

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陈丽华， 赵金龙， 杨涛*(青岛科技大学 化学与分子工程学院，山东 青岛 266042)

 摘要： 利用自掺杂聚苯胺（SPAN）/氧化石墨烯（GNO）纳米复合材料修饰的玻碳电极（GCE），采用阳极溶出伏安法，实现了对水中不同浓度的铅、镉离子的同步检测。该纳米复合材料具有独特的三维交联的纳米墙结构，跟其他传统材料修饰的电极相比，具有更大的有效面积、更强的导电性和高的稳定性。实验结果表明：铅、镉在SPANGNO修饰的玻碳电极上分别于-0524，-0720 V出现灵敏的电位溶出峰，与单独的SPAN与GNO相比，这种独特的纳米墙结构赋予了该复合材料更好的吸附能力与更强的溶出峰电流。在铅、镉离子共存条件下，1~100 μg·L-1浓度范围内，该修饰电极具有良好的线性关系，最低检测限分别达到483×10-9 g·L-1和443×10-7 g·L-1，均低于国家饮用水卫生标准。

关键词： 自掺杂聚苯胺； 氧化石墨烯； 铅镉； 同步检测； 三维交联纳米墙

中图分类号： TB 33                    文献标志码：   A

 Selfdoped Polyanilinegraphene Oxide Nanowalls for Simultaneous Determination of Cd2+ and Pb2+ in Water

CHEN Lihua, ZHAO Jinlong, YANG Tao

(College of Chemistry and Molecular Engineering, Qingdao University of

Science and Technology, Qingdao 266042, China)

Abstract: This article described the preparation, characterization and electrochemical behavior of the novel selfdoped polyanilinegraphene oxide nanocomposite modified glassy carbon electrode toward the detection of heavy metal ions using differential pulse stripping voltammetry. Because of its unique threedimensional crosslinked structure, the nanocomposite owned larger specific surface area and presented good electrochemical response for determination of metal ions compared with other conventional electrode materials. The results indicated that: sensitive and large stripping peaks of Pb2+ and Cd2+ appeared at -0524 V and -0720 V, respectively. In the range of 1—100 μg·L-1, this sensing platform showed a good linear relationship between the peak currents and the concentration of Cd2+ and Pb2+. The detection limits were 483×10-9 g·L-1 for Pb2+; 443×10-7 g·L-1 for Cd2+, which was lower than that of national sanitary standard for drinking water. Accordingly, compared with the individual detection of metal ions, this nanocomposite material is more suitable for simultaneous determination of Cd2+ and Pb2+detection.

Key words: selfdoped polyaniline； grapheme oxide； Cd2+ and Pb2+; simultaneous determination； threedimensional crosslinked nanowalls

收稿日期： 20140421

基金项目： 国家高技术研究发展计划项目（2013AA032204）.

作者简介： 陈丽华（1976—），女，副教授.   *通信联系人.

文章编号：16726987（2015）04036305； DOI： 10.16351/j.16726987.2015.04.002