Kumar Ajay, Kumar Kuldeep, Kaur Kirtanjot, Arya Kushal, Mehta Surinder Kumar, Singh Surinder, Kataria Ramesh
Department of Chemistry, Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh-160014, India.
University Centre for Research and Development, Chandigarh University, Mohali, Punjab, 140301, India.
Anal Methods. 2024 Sep 12;16(35):6020-6029. doi: 10.1039/d4ay00987h.
In this work, a hybrid nanocomposite material (PUC2@rGO) was prepared by integrating our previously developed Zn-MOF (PUC2) with reduced graphene oxide (rGO) through the wet impregnation method. The characterization of PUC2@rGO was performed using various analytical techniques, including FTIR, PXRD, FE-SEM, HR-TEM, XPS, zeta potential, and time-resolved FL spectroscopy. Our investigation primarily focused on assessing the composite's capability to detect water pollutants. Notably, PUC2@rGO demonstrated remarkable selectivity and sensitivity towards Pb and Cu ions fluorescence quenching, exhibiting low detection limits and high quenching constant values. Spectroscopic analysis revealed that electron transfer from PUC2@rGO (donor) to the metal ions (acceptor) resulted in the observed quenching effect induced by Pb and Cu ions. Time-resolved fluorescence studies of PUC2@rGO before and after adding Pb and Cu ions confirmed dynamic quenching, further affirming strong interactions between PUC2@rGO and the targeted metal ions. These findings highlight PUC2@rGO's potential for efficiently detecting heavy metal pollutants in water.
在本工作中，通过湿浸渍法将我们之前开发的锌基金属有机框架材料（PUC2）与还原氧化石墨烯（rGO）相结合，制备了一种杂化纳米复合材料（PUC2@rGO）。使用包括傅里叶变换红外光谱（FTIR）、粉末X射线衍射（PXRD）、场发射扫描电子显微镜（FE-SEM）、高分辨率透射电子显微镜（HR-TEM）、X射线光电子能谱（XPS）、zeta电位和时间分辨荧光光谱等各种分析技术对PUC2@rGO进行了表征。我们的研究主要集中在评估该复合材料检测水中污染物的能力。值得注意的是，PUC2@rGO对Pb和Cu离子表现出显著的选择性和灵敏度——荧光猝灭，具有低检测限和高猝灭常数。光谱分析表明，从PUC2@rGO（供体）到金属离子（受体）的电子转移导致了由Pb和Cu离子引起的观察到的猝灭效应。对添加Pb和Cu离子前后的PUC2@rGO进行的时间分辨荧光研究证实了动态猝灭，进一步证实了PUC2@rGO与目标金属离子之间的强相互作用。这些发现突出了PUC2@rGO在有效检测水中重金属污染物方面的潜力。
