Journal of Applied Electrochemistry ( IF 2.384 ) Pub Date : 2022-02-15 , DOI: 10.1007/s10800-022-01684-z Huanan Guan 1 , Yue Zhang 1 , Shuping Liu 1
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A new type of composite metal–organic framework (Fe3O4@Au/MOF) nanoparticle was prepared by self-assembly method, which had the recyclability of Fe3O4 magnetic particles (Fe3O4NPs) and the advantage of gold nanoparticles (AuNPs) that could accelerate electron transfer. In addition, the mimic enzyme activity of Fe3O4@Au/MOF has been significantly increased because of the presence of Fe3O4NPs and AuNPs. Then physical and chemical characterization of the composite nanoparticle was carried out through advanced technologies, such as Fourier transform infrared spectroscopy, transmission electron microscope and X-ray photoelectron spectroscopy. Finally, based on the peroxidase-like activity enhanced by Fe3O4@Au/MOF composite nanoparticle, a highly specific enzyme-free electrochemical sensor was prepared for the detection of p-aminophenol. The results showed that the optimal catalytic system was the reaction temperature of 50 °C, the addition amount of Fe3O4@Au/MOF of 0.005 g, scanning rate of 0.1 V s−1, and buffer solution pH 5. The working curve equation is |Ipa|= 2.7372C + 2.1068, R2 was 0.9952, and the minimum detection limit was 0.38 μmol L−1 (S/N = 3) when the p-aminophenol concentration was located in the range of 0.1–10 mmol L−1. The detection system possessed an excellent recovery rate and anti-interference. In addition, the proposed method was validated to determine p-aminophenol in water samples with satisfactory results.
Graphical abstract
中文翻译：
基于Fe3O4@Au/MOF类过氧化物酶活性的新型增强型电化学传感器用于检测对氨基苯酚
采用自组装法制备了一种新型复合金属-有机骨架（Fe 3 O 4 @Au/MOF）纳米粒子，具有Fe 3 O 4磁性粒子（Fe 3 O 4 NPs）的可回收性和优点可以加速电子转移的金纳米粒子（AuNPs）。此外，由于 Fe 3 O 4 的存在，Fe 3 O 4 @ Au / MOF的模拟酶活性显着提高NPs 和 AuNPs。然后通过傅里叶变换红外光谱、透射电子显微镜和X射线光电子能谱等先进技术对复合纳米粒子进行物理和化学表征。最后，基于Fe 3 O 4 @Au/MOF复合纳米粒子增强的类过氧化物酶活性，制备了一种用于检测对氨基苯酚的高特异性无酶电化学传感器。结果表明，最佳催化体系为反应温度50 ℃、Fe 3 O 4 @Au/MOF添加量0.005 g、扫描速率0.1 V s -1、缓冲溶液pH 5。曲线方程是 | 我帕|= 2.7372C + 2.1068，R 2为0.9952， 当对氨基苯酚浓度在0.1-10 mmol L -1范围内时，最低检测限为0.38 μmol L -1（S/N = 3） 。该检测系统具有良好的恢复率和抗干扰能力。此外，该方法经验证可用于测定水样中的对氨基苯酚，结果令人满意。
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