Hydrothermal Preparation of Manganese Dioxide/Sulfur Doped Reduced Graphene Oxide and Construction of 4-Nitrotoluene Sensor

Mohd Quasim Khan, Khursheed Ahmad, Rais Ahmad Khan, S. S. Almadhhi, Ali Alsulmi
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Abstract

Nitro-groups containing compounds are widely used in various applications but are considered highly toxic compounds. 4-nitrotoluene (4NT) belongs to the nitro-aromatic compounds and is a highly hazardous water contaminant. Thus, exploring new materials with excellent physiochemical and electrochemical properties is desirable for the construction of efficient 4NT sensors. The present study reports the fabrication of manganese dioxide/sulfur-doped reduced graphene oxide (α-MnO2/S@rGO) via hydrothermal synthesis procedure. The well-characterized α-MnO2/S@rGO was employed as a catalyst for the construction of α-MnO2/S@rGO modified screen printed carbon electrode (SPCE) for the detection of 4NT using cyclic voltammetry (CV). The α-MnO2/S@rGO modified electrode exhibits good electro-catalytic properties for the detection of 4NT compared to the bare SPCE, α-MnO2-, or S@rGO-modified electrodes. A reasonable detection limit of 0.5 µM with sensitivity of 1.97 µA.µM-1.cm-2 was obtained using α-MnO2/S@rGO modified electrode. The α-MnO2/S@rGO modified electrode demonstrated considerable selectivity for the sensing of 4NT in presence of various electro-active species. Note that the combination of catalytic α-MnO2 and conductive S@rGO present excellent synergistic interactions which improved the performance of the α-MnO2/S@rGO-modified electrode.
水热法制备二氧化锰/硫掺杂还原石墨烯氧化物并构建 4-硝基甲苯传感器
含硝基的化合物被广泛应用于各种领域,但被认为是剧毒化合物。对硝基甲苯(4NT)属于硝基芳香族化合物,是一种高度危险的水污染物。因此,探索具有优异物理化学和电化学特性的新材料是构建高效 4NT 传感器的理想选择。本研究报告了通过水热合成法制备二氧化锰/掺硫还原氧化石墨烯(α-MnO2/S@rGO)的过程。表征良好的 α-MnO2/S@rGO 被用作催化剂,用于构建 α-MnO2/S@rGO 改性丝网印刷碳电极 (SPCE),利用循环伏安法 (CV) 检测 4NT。与裸 SPCE、α-MnO2- 或 S@rGO 修饰电极相比,α-MnO2/S@rGO 修饰电极在检测 4NT 方面表现出良好的电催化性能。α-MnO2/S@rGO修饰电极的合理检测限为0.5 µM,灵敏度为1.97 µA.µM-1.cm-2。在各种电活性物质存在的情况下,α-MnO2/S@rGO 修饰电极对 4NT 的检测具有相当高的选择性。催化型 α-MnO2 和导电型 S@rGO 的结合产生了良好的协同作用,从而提高了 α-MnO2/S@rGO 修饰电极的性能。
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