Utilization of waste biomass of Poa pratensis for green synthesis of n-doped carbon dots and its application in detection of Mn2+ and Fe3+

水溶液中的金属离子 检出限 X射线光电子能谱 水溶液 材料科学 量子产额 傅里叶变换红外光谱 分析化学(期刊) 荧光 碳纤维 核化学 离子 化学 化学工程 环境化学 物理化学 色谱法 物理 复合数 工程类 复合材料 有机化学 量子力学
作者
Prakash Krishnaiah,Raji Atchudan,Suguna Perumal,El‐Sayed Salama,Yong Rok Lee,Byong‐Hun Jeon
出处
期刊:Chemosphere [Elsevier BV]
卷期号:286: 131764-131764 被引量:165
标识
DOI:10.1016/j.chemosphere.2021.131764
摘要

In this study, a novel and sustainable approach was used to synthesize nitrogen-doped carbon dots (NCDs) from the waste biomass of Poa Pratensis (Kentucky bluegrass (KB)) by a facile hydrothermal method. The prepared KBNCDs were subjected to various characterization techniques, including X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and Fourier-transform infrared spectroscopy to verify the formation of carbon dots and their surface functional groups. The KBNCDs exhibited good hydrophilic fluorescence (FLU) properties with an acceptable quantum yield (7%). The synthesized KBNCDs showed excitation wavelength-dependent FLU emission behavior with strong cyan-blue FLU upon irradiation with 365 nm UV-light. The hydrophilic optical properties of the as-synthesized KBNCDs were used to detect Fe3+ and Mn2+ ions in an aqueous medium with good selectivity and sensitivity. It was found that the FLU of the KBNCDs is quenched in the presence of Fe3+ and Mn2+ ions, and the quenching rate was linear with the concentration of Fe3+ and Mn2+ ions. The limit of detection (LOD) of KBNCDs with metal ions was calculated using the Stern–Volmer relationship. The LOD values for Fe3+ or Mn2+ ions were calculated as 1.4 and 1.2 μM, respectively with the detection range from 5.0 to 25 μM. Based on these results, this study provides an underpinning for the development of KBNCD as FLU sensors that can be used in aqueous media.
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