Beitollahi Hadi, Tajik Somayeh, Garkani Nejad Fariba
Environment Department, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran.
Research Center of Tropical and Infectious Diseases, Kerman University of Medical Sciences, Kerman, Iran.
Heliyon. 2025 Jan 25;11(3):e42285. doi: 10.1016/j.heliyon.2025.e42285. eCollection 2025 Feb 15.
In the present study, we report the synthesis of MIL-101 (Fe)-NH metal-organic framework/graphene oxide (MIL-101 (Fe)-NH MOF/GO) nanocomposite, which was synthesized through simple solvothermal method. Various characterization techniques including Field-emission scanning electron microscopy (FE-SEM), Energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) were employed for the morphological and structural characterization of the synthesized nanocomposite. Then, the prepared MIL-101 (Fe)-NH/GO nanocomposite was drop-casted on the screen-printed carbon electrode (SPCE) to fabricate a simple, rapid, and sensitive electrochemical sensing platform for ,- determination in the water samples. Comparative analysis using cyclic voltammetry (CV) showed that the MIL-101 (Fe)-NH/GO/SPCE significantly improved the oxidation reaction of 2,4-DCP with observation of higher detection current at lower over-potential compared to unmodified SPCE. This observation can be related to the synergistic combination of MIL-101 (Fe)-NH MOF and GO sheets. The linear response of MIL-101 (Fe)-NH/GO/SPCE sensor for determining 2,4-DCP using voltammetric measurements was observed in the range of 0.001-440.0 μM with a low detection limit (LOD) of 0.5 nM and a high sensitivity of 0.2026 μA μM. Finally, the modified SPCE efficiently exhibits its high accuracy in detecting 2,4-DCP in water samples, demonstrating remarkable recovery percentages of 97.5-104.4 %.
在本研究中，我们报道了通过简单的溶剂热法合成的MIL-101(Fe)-NH金属有机框架/氧化石墨烯(MIL-101(Fe)-NH MOF/GO)纳米复合材料。采用包括场发射扫描电子显微镜(FE-SEM)、能量色散X射线光谱(EDX)和X射线衍射(XRD)在内的各种表征技术对合成的纳米复合材料进行形态和结构表征。然后，将制备的MIL-101(Fe)-NH/GO纳米复合材料滴铸在丝网印刷碳电极(SPCE)上，以构建一个用于测定水样中2,4-二氯苯酚的简单、快速且灵敏的电化学传感平台。使用循环伏安法(CV)进行的对比分析表明，与未修饰的SPCE相比，MIL-101(Fe)-NH/GO/SPCE显著改善了2,4-二氯苯酚的氧化反应，在较低过电位下观察到更高的检测电流。这一现象可能与MIL-101(Fe)-NH MOF和氧化石墨烯片的协同组合有关。使用伏安测量法测定2,4-二氯苯酚时，MIL-101(Fe)-NH/GO/SPCE传感器的线性响应范围为0.001 - 440.0 μM，检测限低至0.5 nM，灵敏度高达0.2026 μA μM⁻¹。最后，修饰后的SPCE在检测水样中的2,4-二氯苯酚时高效地展现出其高精度，回收率高达97.5 - 104.4%。
