基于铜基金属有机骨架-石墨烯复合材料的电化学传感器用于水中二羟基苯异构体的测定。

An electrochemical sensor based on copper-based metal-organic frameworks-graphene composites for determination of dihydroxybenzene isomers in water.

机构信息

College of Chemistry and Chemical Engineering, Shandong Sino-Japanese Center for Collaborative Research of Carbon Nanomaterials, Collaborative Innovation Center for Marine Biomass Fiber Materials and Textiles, Laboratory of Fiber Materials and Modern Textile, the Growing Base for State Key Laboratory, Qingdao University, Qingdao 266071, PR China.

出版信息

Talanta. 2018 May 1;181:80-86. doi: 10.1016/j.talanta.2018.01.002. Epub 2018 Jan 5.

DOI:10.1016/j.talanta.2018.01.002

PMID:29426545

Abstract

A highly and simply sensitive electrochemical sensor was presented for the simultaneous determination of hydroquinone (HQ) and catechol (CT) in the water based on copper centered metal-organic framework-graphene composites (Cu-MOF-GN) [Cu-MOF = Cu(BTC) (BTC = 1, 3, 5-benzenetricarboxylicacid)] modified glassy carbon electrode (Cu-MOF-GN/GCE). The modification procedure was carried out through casting metal-organic framework-graphene oxide composites (Cu-MOF-GO) on the bare glassy carbon electrode and followed by the transformation of Cu-MOF-GO to Cu-MOF-GN by an electrochemical reduction. The electrochemical behavior of HQ and CT at Cu-MOF-GN/GCE was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Under the optimized conditions, the modified electrode had excellent electrocatalytic activity and high selectivity toward HQ and CT. The electrochemical sensor exhibited a linear response in the same range of 1.0 × 10 to 1.0 × 10M with the detection limits of 5.9 × 10M for HQ and 3.3 × 10M for CT (S/N = 3). Four samples of tap water spiked with different concentrations of HQ and CT were considered. The method has been applied to the analysis of these isomers in spiked tap water with recoveries from 99.0 ~ 102.9% and relative standard deviations (RSDs) for 5 successive measurements less than 5% were also acceptable. This method was successfully applied to detect target analytes in the real samples with satisfying results. The MOFs-based sensors in the field of electrochemical sensing held a great promise for routine sensing applications.

摘要

一种高灵敏度、简单的电化学传感器被提出，用于基于铜中心金属有机骨架-石墨烯复合材料（Cu-MOF-GN）[Cu-MOF = Cu（BTC）（BTC = 1,3,5-苯三甲酸）]修饰玻碳电极（Cu-MOF-GN/GCE）对水中的对苯二酚（HQ）和邻苯二酚（CT）进行同时测定。修饰过程是通过将金属有机骨架-氧化石墨烯复合材料（Cu-MOF-GO）涂覆在裸玻碳电极上，然后通过电化学还原将 Cu-MOF-GO 转化为 Cu-MOF-GN 来进行的。通过循环伏安法（CV）、差分脉冲伏安法（DPV）和电化学阻抗谱（EIS）研究了 HQ 和 CT 在 Cu-MOF-GN/GCE 上的电化学行为。在优化条件下，修饰电极对 HQ 和 CT 具有优异的电催化活性和高选择性。电化学传感器在 1.0×10 至 1.0×10M 的相同范围内表现出线性响应，HQ 和 CT 的检测限分别为 5.9×10M 和 3.3×10M（S/N = 3）。考虑了四种自来水样品，其中加入了不同浓度的 HQ 和 CT。该方法已成功应用于加标自来水中这些异构体的分析，回收率在 99.0%至 102.9%之间，5 次连续测量的相对标准偏差（RSD）也可接受，小于 5%。该方法成功地应用于实际样品中目标分析物的检测，取得了令人满意的结果。基于 MOFs 的传感器在电化学传感领域具有常规传感应用的巨大潜力。