School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
Key Laboratory of Hunan Province for Water Environment and Agriculture Product Safety, Changsha, 410083, China.
Mikrochim Acta. 2019 Aug 23;186(9):643. doi: 10.1007/s00604-019-3750-9.
An electrochemical sensor is described for simultaneous determination of hydroquinone (HQ) and catechol (CT) via differential pulse voltammetry (DPV). It is making use of a ternary composite material prepared from oxidized multiwalled carbon nanotubes, manganese dioxide (MnO) and manganese ferrite (MnFeO). The material was obtained by a one-step hydrothermal reaction and used to modify a glassy carbon electrode (GCE). The composite was characterized by Fourier transform infrared spectroscopy, X-ray powder diffraction, thermogravimetric analysis, X-ray photoelectron spectroscopy and scanning electron microscopy. The peak currents for HQ and CT are highest at 172 and 276 mV (vs. Ag/AgCl) at a pH value of 6.0. Response increases linearly in the 1-400 μM HQ and CT concentration ranges, and the detection limits are 0.64 and 0.48 μM, respectively. The modified GCE is highly selective, repeatable and reproducible. A single sensor was used to make 23 subsequent measurements, and the relative standard deviations were 1.8% and 2.3% for HQ and CT, respectively. Graphical abstract Schematic representation of the preparation of ternary nanocomposite and its electrochemical behavior towards hydroquinone and catechol.
电化学传感器通过差分脉冲伏安法（DPV）描述了同时测定对苯二酚（HQ）和邻苯二酚（CT）的方法。它利用由氧化多壁碳纳米管、二氧化锰（MnO）和锰铁氧体（MnFeO）组成的三元复合材料制备。该材料通过一步水热反应获得，并用于修饰玻碳电极（GCE）。通过傅里叶变换红外光谱、X 射线粉末衍射、热重分析、X 射线光电子能谱和扫描电子显微镜对复合材料进行了表征。在 pH 值为 6.0 时，HQ 和 CT 的峰电流在 172 和 276 mV（相对于 Ag/AgCl）处最高。响应在 1-400 μM HQ 和 CT 浓度范围内呈线性增加，检测限分别为 0.64 和 0.48 μM。修饰后的 GCE 具有高度选择性、重复性和重现性。单个传感器可进行 23 次连续测量，HQ 和 CT 的相对标准偏差分别为 1.8%和 2.3%。
