Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, PR China; School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, PR China.
Key Lab of Aerospace Structural Parts Forming Technology and Equipment of Anhui Province, Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei, 230009, PR China; School of Materials Science and Engineering, Hefei University of Technology, Hefei, 230009, PR China; School of Resources and Environmental Engineering, Hefei University of Technology, Hefei, 230009, PR China.
Anal Chim Acta. 2020 Mar 1;1100:31-39. doi: 10.1016/j.aca.2019.11.062. Epub 2019 Nov 27.
Herein the sulfur/nitrogen contained groups, serving as the "hooks" for electrochemical determination of Hg(II), were assembled on the reduced graphene oxide (hereafter SN-rGO) via a one-step facile hydrothermal method. The thiourea acts as a precursor for sulfur/nitrogen doping and partial reduction of graphene oxide. The SN-rGO was used to modify the glassy carbon electrode (GCE) for electrochemical detection of Hg(II) by square wave anodic stripping voltammetry (SWASV). The sulfur/nitrogen doping significantly improves the Hg(II) complexation by SN-rGO due to the creation of multifunctional groups on the graphene nanosheet. The SN-rGO modified electrode has excellent sensitivity (20.48 μA/μM) and limit of detection (LOD 8.93 nM) for Hg(II) detection. The newly developed Hg(II) sensing electrode possesses minimal interference for other ions typically found in natural waters. Therefore, it can be used for routine water quality monitoring. The fabrication of the SN-rGO electrode is rapid and low cost; hence, it offers a potential platform for environmental monitoring of toxic metal ions.
在此，硫/氮基团作为电化学测定 Hg(II)的“钩子”，通过一步简便的水热法组装在还原氧化石墨烯（简称 SN-rGO）上。硫脲作为硫/氮掺杂和部分还原氧化石墨烯的前体。SN-rGO 被用于修饰玻碳电极（GCE），通过方波阳极溶出伏安法（SWASV）电化学检测 Hg(II)。由于在石墨烯纳米片上形成了多功能基团，硫/氮掺杂显著提高了 SN-rGO 对 Hg(II)的络合能力。SN-rGO 修饰电极对 Hg(II)检测具有优异的灵敏度（20.48 μA/μM）和检测限（LOD 8.93 nM）。新开发的 Hg(II)传感电极对天然水中常见的其他离子干扰最小。因此，它可用于常规水质监测。SN-rGO 电极的制备快速且成本低廉；因此，它为有毒金属离子的环境监测提供了一个潜在的平台。
