Tan Xiaoping, Liu Yan, Zhang Tingying, Luo Shasha, Liu Xi, Tian Hexiang, Yang Yang, Chen Chunlian
Key Lab of Inorganic Special Functional Materials, Chongqing Municipal Education Commission, School of Chemistry and Chemical Engineering, Yangtze Normal University Fuling 408100 China
RSC Adv. 2019 Jan 2;9(1):345-353. doi: 10.1039/c8ra08555b. eCollection 2018 Dec 19.
We report a rapid, sensitive and selective electrochemical sensor based on pillar[5]arene (CP5) reduced graphene (rGO) nanohybrid-modified glassy carbon electrode CP5-rGO/GCE for the trace detection of methyl parathion (MP) by differential pulse voltammetry (DPV) for the first time. Compared to beta-cyclodextrin (β-CD)-functionalized reduced graphene (rGO)-modified GCE β-CD-rGO/GCE, the proposed CP5-rGO/GCE sensor exhibits excellent electrochemical catalytic activity, rapid response, high sensitivity, good reproducibility and anti-interference ability towards MP. The recognition mechanism of β-CD/MP and CP5/MP was studied by H NMR. The results indicate a higher supramolecular recognition capability between CP5 and MP compared to that between β-CD and MP. The β-CD-rGO and CP5-rGO nano-composites were prepared a wet chemistry approach. The resulting nano-composites have been characterized by thermogravimetric analysis (TGA), fourier transform infrared spectrometry (FTIR), charge transfer resistance ( ) and zeta potential. The CP5-rGO/GCE combines the merits of CP5 and rGO, and is used for quantitative detection of MP. It has a low detection limit of 0.0003 μM (S/N = 3) and a linear response range of 0.001-150 μM for MP. This method has been used to detect MP in soil and waste water samples with satisfactory results. This study provides a promising electrochemical sensing platform and is a promising tool for the rapid, facile and sensitive analysis of MP.
我们首次报道了一种基于柱[5]芳烃（CP5）还原氧化石墨烯（rGO）纳米杂化修饰玻碳电极CP5-rGO/GCE的快速、灵敏且选择性高的电化学传感器，用于通过差分脉冲伏安法（DPV）对甲基对硫磷（MP）进行痕量检测。与β-环糊精（β-CD）功能化还原氧化石墨烯（rGO）修饰的GCEβ-CD-rGO/GCE相比，所提出的CP5-rGO/GCE传感器对MP表现出优异的电化学催化活性、快速响应、高灵敏度、良好的重现性和抗干扰能力。通过1H NMR研究了β-CD/MP和CP5/MP的识别机制。结果表明，与β-CD和MP之间相比，CP5和MP之间具有更高的超分子识别能力。采用湿化学方法制备了β-CD-rGO和CP5-rGO纳米复合材料。所得纳米复合材料已通过热重分析（TGA）、傅里叶变换红外光谱（FTIR）、电荷转移电阻（ ）和zeta电位进行了表征。CP5-rGO/GCE结合了CP5和rGO的优点，用于MP的定量检测。它对MP的检测限低至0.0003 μM（S/N = 3），线性响应范围为0.001 - 150 μM。该方法已用于检测土壤和废水样品中的MP，结果令人满意。本研究提供了一个有前景的电化学传感平台，是快速、简便且灵敏分析MP的有前途的工具。
