碳点 (CD) 的绿色合成及其在选择性测定 Pb2 中的应用。

Muhammad Idrees, Najmus Saqib, Gohar Zaman
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引用次数: 0

摘要

通过一步水热法从葫芦巴种子中合成了碳点。该方法简单、快速、环保且成本较低。通过傅立叶变换红外(FTIR)、紫外-可见分光光度计、X 射线衍射(XRD)、高分辨率透射电子显微镜(HR-TEM)和荧光法对碳点进行了表征。获得的碳点具有极强的荧光性。荧光碳点表现出与激发有关的行为,最大激发波长为 372 纳米。研究了 CD 与不同阳离子 Al3+、Ca2+、Cd2+、Cr3+、Co2+、Cu2+、Cu+、Fe2+、Fe3+、K+、Sn4+、Na+、Ni2+、Pb2+、Mn2+、Zn2+、Sr2+、(NH4)6Mo7O24、4H2O、Cr6+、Sb3+、Ba2+、Li+ 和 Mg2+ 的相互作用。除了 Pb2+ 会降低其荧光强度外,所研究的其他离子都不会对其荧光强度产生任何影响。研究发现,Pb2+ 浓度与 CDs 强度淬灭之间存在直接关系。检测限(DL)和定量限(QL)被确定为十次测量中空白标准偏差的三倍和十倍。发现 DL 和 QL 分别为 9.345 μM 和 31.15 μM。这种淬灭与 Pb2+ 浓度之间的线性关系有助于分析。
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Green synthesis of carbon dots (CDs) and their use for selective determination of Pb2.

Carbon dots were synthesized from fenugreek seeds through a single step hydrothermal method. The method is simple, fast, pleasant to the environment and cheaper. The CDs were characterized by Fourier Transform Infrared (FTIR), UV-visible spectrophotometer, X-ray diffraction (XRD), High Resolution Transmission electron microscopy (HR-TEM), and fluorescence. The CDs obtained were extremely fluorescent. The fluorescent carbon dots exhibited excitation-dependent behavior with the maximum excitation at 372 nm. The interaction of CDs was studied with different selected cations Al3+, Ca2+, Cd2+, Cr3+, Co2+, Cu2+, Cu+, Fe2+, Fe3+, K+, Sn4+, Na+, Ni2+, Pb2+, Mn2+, Zn2+, Sr2+, (NH4)6Mo7O24, 4H2O, Cr6+, Sb3+, Ba2+, Li+, and Mg2+. None of the ions studied showed any effect on its fluorescence intensity except Pb2+ which decreased its intensity. A direct relationship was found between Pb2+ concentrations and quenching of CDs intensity. Detection limit (DL) and quantification limits (QL) were determined as three and ten times of the standard deviation of the blank for ten number of measurements. DL and QL were found in the order 9.345 μM and 31.15 μM respectively. This linear behavior between quenching and Pb2+ concentration is useful for analytical purpose.

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