School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
School of Chemistry and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
J Hazard Mater. 2021 Aug 15;416:125895. doi: 10.1016/j.jhazmat.2021.125895. Epub 2021 Apr 20.
Ce-MOF/CNTs nanocomposites were prepared by a simple method and post-treated with NaOH/HO mixed solution. The morphology and structure of the treated samples were characterized by transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that the post treatment induces the Ce-MOF morphological changing from rod-like structure into particles, which are covered on the surface of CNTs. XPS demonstrates that there are two-valence (TV) of Ce/Ce in the post-treated Ce-MOF/CNTs (TV) composite. The electrochemical behaviors of nanocomposite were also investigated on electrochemical work station. By utilization of the good electrical conductivity of CNT, the two-valence of Ce and the high surface area of MOF, the nanocomposites were used to fabricate the electrochemical sensor for the simultaneous electrochemical detection of hydroquinone (HQ) and catechol (CC). Compared to the Ce-MOF/CNTs/GCE, the post-treated Ce-MOF (TV)/CNTs/GCE exhibited two well-defined peaks for the electrochemical oxidation of HQ and CC. The linear ranges responding to HQ and CC are 10100 μM and 550 μM respectively.
Ce-MOF/CNTs 纳米复合材料采用简单的方法制备，并采用 NaOH/HO 混合溶液进行后处理。用透射电子显微镜（TEM）、扫描电子显微镜（SEM）、X 射线衍射（XRD）和 X 射线光电子能谱（XPS）对处理后的样品的形貌和结构进行了表征。结果表明，后处理导致 Ce-MOF 的形态从棒状结构变为颗粒状，颗粒状结构覆盖在 CNTs 的表面。XPS 表明，在经过后处理的 Ce-MOF/CNTs（TV）复合材料中存在两种价态（TV）的 Ce/Ce。还在电化学工作站上研究了纳米复合材料的电化学行为。通过利用 CNT 的良好导电性、Ce 的两种价态和 MOF 的高表面积，将纳米复合材料用于构建电化学传感器，用于同时电化学检测对苯二酚（HQ）和邻苯二酚（CC）。与 Ce-MOF/CNTs/GCE 相比，经过后处理的 Ce-MOF（TV）/CNTs/GCE 对 HQ 和 CC 的电化学氧化表现出两个清晰的峰。响应 HQ 和 CC 的线性范围分别为 10100 μM 和 550 μM。
