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首页> 外文期刊>RSC Advances >Green synthesized silver nanoparticles decorated on reduced graphene oxide for enhanced electrochemical sensing of nitrobenzene in waste water samples
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Green synthesized silver nanoparticles decorated on reduced graphene oxide for enhanced electrochemical sensing of nitrobenzene in waste water samples

机译：绿色合成的银纳米颗粒修饰的氧化石墨烯，用于增强废水样品中硝基苯的电化学感应

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摘要

In the present work, an electrochemical sensor for nitrobenzene (NB) has been developed based on a green synthesized silver nanoparticles (AgNPs) decorated reduced graphene oxide (RGO) modified glassy carbon electrode (GCE). The AgNPs were synthesized using Justicia glauca leaf extract as a reducing and stabilizing agent. A RGO-AgNPs composite modified electrode was prepared by a simple electrochemical reduction of AgNPs dispersed GO solution. FESEM of RGO-AgNPs composite confirms that AgNPs are firmly attached on the RGO sheets and the average size of AgNPs is found to be 40 +/- 5 nm. The modified electrode shows good efficiency with lower overpotential for electrocatalytic reduction of NB than that of other modified electrodes (AgNPs and RGO). The DPV response confirms that the reduction peak current of NB is linear over the concentrations from 0.5 to 900 mu M. The sensitivity of the sensors is found to be 0.836 mu A mu M-1 cm(-2) with the detection limit of 0.261 mu M for NB. In addition, the RGO-AgNPs composite modified electrode shows good selectivity in the presence of potentially interfering similar compounds and good practicality in the waste water samples.
机译：在目前的工作中，基于绿色合成的银纳米颗粒（AgNPs）装饰的还原氧化石墨烯（RGO）修饰的玻碳电极（GCE），开发了一种硝基苯（NB）电化学传感器。使用青冈叶提取物作为还原剂和稳定剂合成AgNP。通过简单的电化学还原AgNPs分散的GO溶液制备了RGO-AgNPs复合修饰电极。 RGO-AgNPs复合材料的FESEM证实AgNPs牢固地附着在RGO板上，并且AgNPs的平均尺寸为40 +/- 5 nm。与其他修饰电极（AgNPs和RGO）相比，修饰电极在NB的电催化还原方面显示出较高的效率和较低的过电势。 DPV响应证实了NB的还原峰值电流在0.5至900μM的浓度范围内呈线性关系。传感器的灵敏度为0.836μAμM-1 cm（-2），检测极限为0.261微米为NB。此外，RGO-AgNPs复合修饰电极在存在潜在干扰的相似化合物的情况下显示出良好的选择性，并且在废水样品中具有良好的实用性。

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