化工学报2017，Vol.68Issue(12)：4816-4823,8.DOI:10.11949/j.issn.0438-1157.20170587
基于石墨烯纳米材料的水质Cr(Ⅵ)电化学传感器
Graphene nanomaterial based electrochemical sensor for Cr(Ⅵ) detection in water
摘要
Abstract
The heavy metal ion pollution of hexavalent chromium (Cr(Ⅵ)) in water is serious in China. An electrochemical sensor for hexavalent chromium (Cr(Ⅵ)) detection is proposed based on graphene nanomaterial. The graphene nanomaterial modified gold electrode (rGO/Au) was prepared by using the method of electrochemical reduction of graphene oxide (GO). The surface morphology and structure of rGO/Au were characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM) technologies. The direct electrocatalytic reduction of Cr(Ⅵ) on the surface of rGO/Au was studied by using electrochemical methods such as square wave voltammetry (SWV), cyclic voltammetry (CV) and linear sweep voltammetry (LSV), etc. The preparation conditions were optimized which include GO reduction potential and reduction time, as well as the detection parameters, such as detection potential, pH and concentration of electrolyte. Without preconcentration step, the linear relationship between Cr(Ⅵ) concentrations and current responses on the rGO/Au was investigated by using amperometry method. The experimental results showed that graphene nanomaterial has electrocatalytic activity for Cr(Ⅵ) reduction. A good linear relationship between Cr(Ⅵ) concentrations and current responses was obtained from 5 to 2000 μg·L-1, with a low detection limit of 0.5 μg·L-1 (S/N≥3). The modified electrode was resistant to some common metal interference ions, such as Cr(Ⅲ), Ni(Ⅱ), Cu(Ⅱ), Mg(Ⅱ) and Mn(Ⅱ). And the response current decreased less than 10％ compared to the initial value after 11 successive measures, which showed a relative good stability. The advantages of the proposed electrochemical sensor are simple, fast, friendly environmental and reusable, which made it possible to apply the sensor for rapid detection of Cr(Ⅵ) in water.关键词
石墨烯/纳米材料/重金属Cr(Ⅵ)/电催化还原/电化学/传感器Key words
graphene/nanomaterial/heavy metal ion Cr(Ⅵ)/electrocatalytic reduction/electrochemistry/sensor分类
信息技术与安全科学引用本文复制引用
李玥琪,胡敬芳,邹小平,高国伟..基于石墨烯纳米材料的水质Cr(Ⅵ)电化学传感器[J].化工学报,2017,68(12):4816-4823,8.基金项目
国家自然科学基金项目(9011610902) （9011610902）
北京市教育委员会科技专项基金项目(KM201611232021). supported by the National Natural Science Foundation of China (9011610902) and the Science and Technology Project of Beijing Educational Committee (KM201611232021). （KM201611232021）
