Department of Medicinal and Applied Chemistry, Kaohsiung Medical University, Kaohsiung City, 807, Taiwan, Republic of China.
Research Center for Environmental Medicine, Kaohsiung Medical University, Kaohsiung City, 807, Taiwan, Republic of China.
Environ Sci Pollut Res Int. 2020 May;27(15):17481-17491. doi: 10.1007/s11356-019-05494-3. Epub 2019 May 31.
We demonstrate a facile preparation of novel oxidized graphitic carbon nitride (O-gCN) applied as an efficient electrocatalyst for highly sensitive electrochemical detection of 4-nitrophenol (4-NP) in environmental water samples. As-prepared O-gCN were characterized by attenuated total reflection infrared spectroscopy, X-ray photoelectron spectroscopy, and X-ray diffraction methods for the confirmation of different functional groups and structural phase of O-gCN. The surface morphology of the O-gCN was characterized using field emission scanning electron microscopy and high-resolution transmission electron microscopy. Results revealed that the synthesized gCN possessed acid functional groups, nanosheet with porous in nature. The O-gCN was drop cast on the screen-printed electrode (SPE), and it was applied for electrochemical determination of 4-NP using cyclic voltammetry and differential pulse voltammetry (DPV) techniques. The O-gCN/SPE exhibited excellent electrocatalytic activity towards 4-NP detection. Under the optimized experimental conditions, the DPV response of O-gCN/SPE showed good linear range from 0.0033 to 0.313 μM with a detection limit (S/N = 3) of 0.075 μM. The developed electrode has successfully applied for the determination of 4-NP in different environmental water samples, and the results have shown satisfied.
我们展示了一种简便的制备新型氧化石墨相氮化碳（O-gCN）的方法，将其应用于环境水样中 4-硝基苯酚（4-NP）的高灵敏度电化学检测的高效电催化剂。所制备的 O-gCN 通过衰减全反射红外光谱、X 射线光电子能谱和 X 射线衍射方法进行了不同官能团和 O-gCN 结构相的确认。O-gCN 的表面形貌通过场发射扫描电子显微镜和高分辨率透射电子显微镜进行了表征。结果表明，所合成的 gCN 具有酸性官能团，具有纳米片和多孔的特性。O-gCN 通过滴铸法涂覆在丝网印刷电极（SPE）上，并通过循环伏安法和差分脉冲伏安法（DPV）技术用于 4-NP 的电化学测定。O-gCN/SPE 对 4-NP 的检测表现出优异的电催化活性。在优化的实验条件下，O-gCN/SPE 的 DPV 响应在 0.0033 至 0.313 μM 之间呈现出良好的线性范围，检测限（S/N = 3）为 0.075 μM。该开发的电极已成功应用于不同环境水样中 4-NP 的测定，结果令人满意。
