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Thioglycolic Acid Capped CdTe Quantum Dots as Sensors for the Detection of Hazardous Heavy Metal Ion Cu2+ in Water
MAPAN ( IF 1 ) Pub Date : 2021-07-27 , DOI: 10.1007/s12647-021-00479-5
Meenakshi Rana 1 , Kamal Devlal 1
Affiliation  

Nowadays, the major concerns to human health are toxic heavy metal contamination. So, there has been an urgent requirement for trustworthy and quick methods for the detection of hazardous heavy metal ions in the water samples. Over the past two decades, Quantum dots (QDs) have been developed as sensitive sensors, due to their unique luminescence property. In the present work, we have developed a rapid, cheap and water-soluble thioglycolic acid (TGC) capped CdTe quantum dot (QD) sensor for the detection of Cu2+ hazardous heavy metal ions in water. By using one-step method, water-soluble TGC capped CdTe QDs have been prepared. TGC capped QDs were characterized by different spectroscopy techniques. Time and temperature dependency on the fluorescence response were observed. In the presence of Cu2+metal ions, a strong “Turn-Off” fluorescence response is detected. A strong 1:1 complexation (Cu2+: TGC capped CdTe QDs) between TGC capped CdTe QDs and metal ion were verified by the output of Benesi–Hildebrand relation and Job’s plot. Our findings suggested that TGC capped CdTe QD shows better response towards Cu2+ metal ions and can be used for the detection of Cu2+ metal ions in water medium.



中文翻译:

硫乙醇酸封端的 CdTe 量子点作为检测水中有害重金属离子 Cu2+ 的传感器

如今,人类健康的主要问题是有毒的重金属污染。因此,迫切需要一种可靠、快速的方法来检测水样中的有害重金属离子。在过去的二十年中,量子点 (QD) 由于其独特的发光特性而被开发为敏感传感器。在目前的工作中,我们开发了一种快速、廉价且水溶性的巯基乙酸 (TGC) 封端的 CdTe 量子点 (QD) 传感器,用于检测水中的 Cu 2+有害重金属离子。通过一步法制备了水溶性 TGC 封端的 CdTe QD。TGC 封端的 QD 用不同的光谱技术表征。观察到荧光响应的时间和温度依赖性。在 Cu 2+存在下金属离子,检测到强烈的“关闭”荧光响应。Benesi-Hildebrand 关系的输出和乔布斯图证实了 TGC 封端的 CdTe QD 和金属离子之间的强 1:1 络合(Cu 2+ : TGC 封端的 CdTe QD)。我们的研究结果表明,TGC 封端的 CdTe QD 对 Cu 2+金属离子显示出更好的响应,可用于检测水介质中的 Cu 2+金属离子。

更新日期:2021-07-27
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