Electro Organic and Materials Electrochemistry (EME) Division, CSIR-Central Electrochemical Research Institute, Karaikudi, Tamil Nadu, 630 003, India.
Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201002, India.
Mikrochim Acta. 2020 Sep 8;187(10):552. doi: 10.1007/s00604-020-04525-y.
The electrochemical determination of 4-nitrophenol using a nanohybrid consisting of glassy carbon (GC) and zinc oxide/graphitic carbon nitride (ZnO/g-CN nanosheet), is described. The ZnO/g-CN nanohybrid was in situ synthesized by chemical method and well characterized using absorption spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy and transmission electron microscopic analysis. It was observed that the nanosized ZnO particles were present inside the sheet-like g-CN nanostructure. The nanohybrid-modified electrode showed an enhanced electrocatalytic response for 4-nitrophenol reduction compared with the bare GC electrode. The assay exhibited linear ranges of 13.4-100 μM and 100-1000 μM for 4-NP determination. The limit of detection and limit of quantification were 4.0 and 13.4 μM, respectively, at the working potential of - 0.85 V. An appreciable precision was found towards the stability of the assay in the determination. It provides selectivity against inorganic and organic substances such as calcium chloride, potassium chloride, nitrobenzene, uric acid, 1-chloro,2,4-dinitrobenzene, 1-bromo,2-nitrobenzene and 1-iodo,2-nitrobenzene. The practical applicability of the assay was also checked in the analysis of real water samples and satisfactory recovery of 4-NP was found. Schematic representation of the synthesis of zinc oxide (ZnO) nanostructures incorporated graphitic carbon nitride nanosheets (g-CN NSs) and its application in the voltammetric determination of 4-nitrophenol (4-NP) is presented. The nanohybrid assay showed selectivity among coexisting compounds and good recovery in real sample analysis.
本文描述了一种使用由玻璃碳（GC）和氧化锌/石墨相氮化碳（ZnO/g-CN 纳米片）组成的纳米杂化材料电化学测定 4-硝基苯酚的方法。通过化学方法原位合成了 ZnO/g-CN 纳米杂化物，并通过吸收光谱、X 射线衍射、X 射线光电子能谱和透射电子显微镜分析对其进行了很好的表征。观察到纳米尺寸的 ZnO 颗粒存在于片状 g-CN 纳米结构内。与裸 GC 电极相比，纳米杂化物修饰电极对 4-硝基苯酚还原表现出增强的电催化响应。该测定法对 4-NP 的测定表现出 13.4-100 μM 和 100-1000 μM 的线性范围。在工作电位为-0.85 V 时，检测限和定量限分别为 4.0 和 13.4 μM。在测定过程中，该方法的稳定性表现出相当可观的精度。它对氯化钙、氯化钾、硝基苯、尿酸、1-氯-2,4-二硝基苯、1-溴-2-硝基苯和 1-碘-2-硝基苯等无机和有机物质具有选择性。该测定法在实际水样分析中的实际适用性也得到了检验，并发现 4-NP 的回收率令人满意。呈现了氧化锌（ZnO）纳米结构掺入石墨相氮化碳纳米片（g-CN NSs）的合成示意图及其在伏安法测定 4-硝基苯酚（4-NP）中的应用。纳米杂化物测定法在共存化合物中表现出选择性，并且在实际样品分析中具有良好的回收率。
