標題: Fluorescent Determination of Copper(II) in Industrial Wastewater Using Thiol-Capped Cadmium Sulfide-Zinc Sulfide Quantum Dots as the Probe
作者: Hsu, Shu-Kang
Chang, Zhao-Jun
Chang, Sue-Min
環境工程研究所
Institute of Environmental Engineering
關鍵字: Fourier transform infrared (FTIR) spectroscopy;inductively coupled plasma-optical emission spectrometry (ICP-OES);L-cysteine (LC);mercaptosuccinic acid (MSA);quantum dots (QDs);thin-film transistor-liquid crystal display (TFT-LCD);thioglycolic acid (TGA);transmission electron microscopy (TEM)
公開日期: 1-Jan-2018
摘要: In situ detection of Cu2+ ions in the effluent from thin-film transistor-liquid crystal display (TFT-LCD) manufacturing facility has been successfully achieved using thiol-capped CdS/ZnS quantum dots (QDs) as the fluorescence probes. Three types of ligands, including L-cysteine (LC), mercaptosuccinic acid (MSA), and thioglycolic acid (TGA), were used as capping agents for stabilizing and functionalizing the QDs. Fluorescence quenching of the QDs by Cu2+ ions was well fitted by the Stern-Volmer equation, indicating a static quenching process. Interaction between the Cu2+ ions and the thiol-based capping agents to form Cu-S bonding was responsible for the nonradiative decay. The thiol-capped probes exhibited low detection limits (0.016-0.063mgL(-1)), high recovery (81.7-114.5%), good precision (relative standard deviation=0.36-4.56%), and suitable accuracy for the detection of Cu2+ ions in the field samples, even though those that contained Ca2+, Mg2 +, Na+, K+, and ions, which were 300-16,600 times higher in concentration than the target. These results clearly verify the feasibility of using the QDs as an early warning system for assisting TFT-LCD manufacturing facilities in compliance with strict effluent standards (0.15mgL(-1)). Among the three types of thiol-capped QDs, the TGA-capped probes were the most sensitive and the LC-capped probes exhibited the highest errors. Substantial loading of the small TGA ligands on the surface and competitive complexation of the amino groups with Cu2+ ions are responsible for the benefits and the consequences of the TGA- and LC-capped QDs for Cu2+ sensing, respectively.
URI: http://dx.doi.org/10.1080/00032719.2017.1338715
http://hdl.handle.net/11536/144365
ISSN: 0003-2719
DOI: 10.1080/00032719.2017.1338715
期刊: ANALYTICAL LETTERS
Volume: 51
起始頁: 547
結束頁: 563
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