School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, Wuhan, 430073, China.
School of Chemistry and Environmental Engineering, Key Laboratory for Green Chemical Process of Ministry of Education, Hubei Key Lab of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, Wuhan, 430073, China; Key Laboratory of Analytical Chemistry for Biology and Medicine (Ministry of Education), Wuhan University, Wuhan, 430072, China.
Anal Chim Acta. 2020 Aug 22;1126:63-71. doi: 10.1016/j.aca.2020.06.010. Epub 2020 Jun 20.
Heavy metal ions (e.g., Cd and Pb) are widely existed in environment and highly toxic. Their convenient, sensitive, and selective determination is thus desirable. In this study, a novel electrochemical sensing interface is developed using the composite of CeO nanomaterials supported on expanded graphite as the sensitive materials. As-prepared CeO nanomaterials through a hydrothermal method feature different morphologies (e.g., nanocube, nanopolyhedra, and nanorod-shape). Electrocatalytic ability of this interface and sensing performance towards the monitoring of Cd and Pb ions rely on the morphology and structure of used CeO nanomaterial. The interface using nanorod-shape CeO nanomaterials supported on expanded graphite exhibits superior electrochemical activity, namely remarkable signal enhancement for the monitoring of Cd and Pb ions. The developed electrochemical sensor with this r-CeO/EG composite as the sensitive material delivers the detection limits of 0.39 and 0.21 μg L for Cd and Pb ions, respectively.
重金属离子（例如 Cd 和 Pb）广泛存在于环境中，具有高度毒性。因此，人们希望能够方便、灵敏和选择性地对其进行测定。在本研究中，我们开发了一种新型的电化学传感界面，该界面使用负载在膨胀石墨上的 CeO 纳米材料作为敏感材料。通过水热法制备的 CeO 纳米材料具有不同的形态（例如纳米立方体、纳米多面体和纳米棒状）。该界面的电催化能力和对 Cd 和 Pb 离子监测的传感性能取决于所使用的 CeO 纳米材料的形态和结构。以膨胀石墨负载纳米棒状 CeO 纳米材料作为敏感材料的界面表现出优异的电化学活性，即对 Cd 和 Pb 离子的监测具有显著的信号增强。以 r-CeO/EG 复合材料作为敏感材料的开发电化学传感器对 Cd 和 Pb 离子的检测限分别为 0.39 和 0.21μg L。
