荧光
碳纤维
材料科学
水溶液
检出限
水溶液中的金属离子
吸收(声学)
离子
热解
分析化学(期刊)
光化学
金属
核化学
化学
有机化学
复合数
光学
色谱法
物理
复合材料
冶金
作者
Saheed O. Sanni,Theo H. G. Moundzounga,Ekemena O. Oseghe,Nils Haneklaus,Elvera Viljoen,Hendrik Gideon Brink
出处
期刊:Nanomaterials
[MDPI AG]
日期:2022-03-14
卷期号:12 (6): 958-958
被引量:13
摘要
Renewable biowaste-derived carbon dots have garnered immense interest owing to their exceptional optical, fluorescence, chemical, and environmentally friendly attributes, which have been exploited for the detection of metals, non-metals, and organics in the environment. In the present study, water-soluble fluorescent carbon dots (CDs) were synthesized via facile green microwave pyrolysis of pine-cone biomass as precursors, without any chemical additives. The synthesized fluorescent pine-cone carbon dots (PC-CDs) were spherical in shape with a bimodal particle-size distribution (average diameters of 15.2 nm and 42.1 nm) and a broad absorption band of between 280 and 350 nm, attributed to a π-π* and n-π* transition. The synthesized PC-CDs exhibited the highest fluorescent (FL) intensity at an excitation wavelength of 360 nm, with maximum emission of 430 nm. The synthesized PC-CDs were an excellent fluorescent probe for the selective detection of Cu2+ in aqueous solution, amidst the presence of other metal ions. The FL intensity of PC-CDs was exceptionally quenched in the presence of Cu2+ ions, with a low detection limit of 0.005 μg/mL; this was largely ascribed to Cu2+ ion binding interactions with the enriched surface functional groups on the PC-CDs. As-synthesized PC-CDs are an excellent, cost effective, and sensitive probe for detecting and monitoring Cu2+ metal ions in wastewater.
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