CSIR-Central Salt and Marine Chemicals Research Institute, Bhavnagar, Gujarat, 364 002, India.
Department of Physics, The MK Bhavnagar University, Bhavnagar, Gujarat, 364 002, India.
Environ Sci Pollut Res Int. 2021 Sep;28(34):46336-46342. doi: 10.1007/s11356-020-07891-5. Epub 2020 Feb 13.
Fluorescent graphene quantum dots (GQDs) are nanomaterials which possess unique properties that show great potential in different applications. In this work, GQDs were synthesized using graphene oxide (GO) as precursor via thermal treatment at high temperature. The obtained GQDs were highly fluorescent and were suitable for the determination of heavy metal ions. X-ray diffraction, FTIR spectroscopy, and UV visible spectroscopy confirm the formation of GQDs. TEM images show that formed GQDs have size ranging from 2 to 10 nm. Emission profile of aqueous GQDs was taken by exciting GQDs at different wavelength. The intensity of GQDs remains the same for 4-5 months. Furthermore, as prepared, GQDs were used for selective recognition of Fe, Pb, and Cr from the bunch of different metal ions in aqueous media. Lower limit of detection obtained for Fe, Cr and Pb using GQDs were 50, 100 and 100 nM, respectively, which indicates that the GQDs can be utilized as a promising material for sensing of the heavy metal ions. Graphical abstract.
荧光石墨烯量子点（GQDs）是一种纳米材料，具有独特的性质，在不同的应用中具有很大的潜力。在这项工作中，GQDs 是通过在高温下对氧化石墨烯（GO）进行热处理合成的。所得到的 GQDs 具有很强的荧光性，适用于重金属离子的测定。X 射线衍射、傅里叶变换红外光谱和紫外可见光谱证实了 GQDs 的形成。TEM 图像显示形成的 GQDs 的尺寸在 2 到 10nm 之间。通过在不同波长下激发 GQDs 获得了水相 GQDs 的发射谱。GQDs 的强度在 4-5 个月内保持不变。此外，所制备的 GQDs 可用于在水相介质中从一堆不同的金属离子中选择性识别 Fe、Pb 和 Cr。使用 GQDs 获得的 Fe、Cr 和 Pb 的检测限下限分别为 50、100 和 100nM，表明 GQDs 可作为一种有前途的用于检测重金属离子的材料。
