Simultaneous and sensitive electrochemical detection of dihydroxybenzene isomers with UiO-66 metal-organic framework/mesoporous carbon
Simultaneous and sensitive electrochemical detection of dihydroxybenzene isomers with UiO-66 metal-organic framework/mesoporous carbon
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UiO-66金属有机骨架/介孔碳同时灵敏电化学检测二羟基苯异构体
DOI：
10.1016/j.talanta.2017.06.061
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发表时间：
2017-11-01
期刊：
影响因子：
6.1
通讯作者：
Guo, Liping
中科院分区：
文献类型：
--
作者：
Deng, Min;Lin, Shourui;Guo, Liping
首次采用常规水热法合成了锆基金属有机框架（UiO - 66）/介孔碳（MC）复合材料。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、傅里叶变换红外光谱（FT - IR）、X射线衍射（XRD）和X射线光电子能谱（XPS）对UiO - 66/MC复合材料的表面形貌和结构进行了表征。构建了一种基于UiO - 66/MC的新型电化学传感器，用于同时灵敏测定对苯二酚（HQ）、邻苯二酚（CT）和间苯二酚（RS）三种二羟基苯异构体（DBIs）。所提出的传感器对HQ、CT和RS的氧化表现出优异的电催化活性。CT与HQ以及RS与CT之间的峰 - 峰电位差分别为0.130 V和0.345 V。在优化条件下，该电化学传感器在0.5 - 100 μM、0.4 - 100 μM和30 - 400 μM的浓度范围内呈现出宽的线性响应，对HQ、CT和RS的检测限分别为0.056 μM、0.072 μM和3.51 μM（S/N = 3）。此外，该传感器具有优异的灵敏度和电化学稳定性，以及良好的重现性和抗干扰性能。所制备的传感器还应用于实际水样中DBIs的测定，结果令人满意。
The zirconium-based MOF (UiO-66)/mesoporous carbon (MC) composite was synthesized using conventional hydrothermal method for the first time. The surface morphology and structure of UiO-66/MC composite were characterized by scanning electron microscopy (SEM), transmission electron microscope (TEM), Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). A novel electrochemical sensor based on UiO-66/MC was constructed for simultaneous and sensitive determination of dihydroxybenzene isomers (DBIs) of hydroquinone (HQ), catechol (CT) and resorcinol (RS). The proposed sensor displays excellent electrocatalytic activity toward the oxidation of HQ, CT and RS. The peak-to-peak potential separations between CT and HQ, and RS and CT are 0.130 V and 0.345 V, respectively. Under the optimized conditions, the electrochemical sensor shows a wide linear response in the concentration range of 0.5-100 mu M, 0.4-100 mu M and 30-400 mu M with a detection limit of 0.056 mu M, 0.072 mu M and 3.51 mu M (S/N = 3) for HQ, CT and RS, respectively. In addition, the sensor has superior sensitivity and electrochemical stability along with good reproducibility and anti-interference properties. The fabricated sensor was also applied for the determination of DBIs in the real water samples with satisfying results.