Herein, we fabricated a feasible and accurate sensing platform for the quantification of toxic organic pollutant 2-nitroaniline (2-NA) in water samples through electrocatalyst made up of bismuth molybdate (Bi2MoO6, BMO) functionalized carbon nanofiber (f-CNF) modified electrode. The preparation of BMO/f-CNF composite is of two methods, such as co-precipitation (C-BMO/f-CNF) and ultrasonication method (U-BMO/f-CNF). The physicochemical properties of the composites were characterized by XRD, FTIR, Raman, BET, FE-SEM, and HR-TEM techniques. At U-BMO/f-CNF, the charge transfer resistance was low (Rct = 12.47 Ω) compared to C-BMO/f-CNF because nanosized U-BMO particles correctly aim at the defective sites of the f-CNF surface wall. Further, the electrocatalytic activity of C&U-BMO/f-CNF composites was examined by cyclic voltammetry (CV) and differential pulse voltammetry techniques (DPV) for the electrochemical detection of 2-nitroaniline (2-NA). The U-BMO/f-CNF/GCE shows a higher cathodic current, wide dynamic linear range of 0.01-168.01 µM, and superior electrocatalytic activity with a low detection limit (0.0437 µM) and good sensitivity (0.6857 μA μM-1 cm-2). The excellent selectivity nature of U-BMO/f-CNF/GCE was observed in the presence of various organic pollutants and a few toxic metal cations. The practical applicability such as stability, repeatability towards 2-NA outcomes with accepted results. Besides, the practical viability of as proposed U-BMO/f-CNF sensor was investigated in soil and lake water samples delivers good recovery results. Hence from these analyses, we conclude that U-BMO/f-CNF/GCE potential for the determination of hazardous environmental pollutant 2-NA.

译文

在此,我们通过由钼酸铋 (Bi2MoO6,BMO) 功能化的碳纳米纤维 (f-cnf) 修饰电极组成的电催化剂,制造了一种可行且准确的传感平台,用于定量水样中的有毒有机污染物2-硝基苯胺 (2-NA)。BMO/f-cnf复合材料的制备有两种方法,如共沉淀法 (c-bmo/f-cnf) 和超声法 (U-BMO/f-cnf)。通过XRD,FTIR,Raman,BET,fe-sem和hr-tem技术对复合材料的理化性能进行了表征。在U-BMO/f-CNF处,与C-BMO/f-CNF相比,电荷转移电阻低 (Rct = 12.47 Ω),因为纳米尺寸的U-BMO颗粒正确地瞄准了f-cnf表面壁的缺陷部位。此外,通过循环伏安 (CV) 和差分脉冲伏安技术 (DPV) 检查了C & U-BMO/f-CNF复合材料的电催化活性,用于2-硝基苯胺 (2-NA) 的电化学检测。U-BMO/f-CNF/GCE显示出更高的阴极电流,0.01-168.01 µ m的宽动态线性范围以及优异的电催化活性,具有低检出限 (0.0437 µ m) 和良好的灵敏度 (0.6857 μ a μ m-1 cm-2)。在存在各种有机污染物和一些有毒金属阳离子的情况下,观察到U-BMO/f-CNF/GCE的优异选择性。实际适用性,如稳定性、对2-NA结果的可重复性和公认的结果。此外,还研究了所提出的U-BMO/f-CNF传感器在土壤和湖水样品中的实际可行性,并提供了良好的回收效果。因此,从这些分析中,我们得出结论,U-BMO/f-CNF/GCE在测定危险环境污染物2-NA方面的潜力。

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