期刊
TOXICS
卷 10, 期 7, 页码 -出版社
MDPI
DOI: 10.3390/toxics10070367
关键词
QDs; fluorescence quenching; fluorescence restore; Cd2+ detection; adsorption; desorption
资金
- Programs for Natural Science Foundation of Guangxi [2019GXNSFAA185013]
- Science and Technology Major Project of Guangxi Province [AA18118030]
- Guangxi Key Laboratory Development Foundation [GXYSSF1802]
- National Natural Science Foundation of China [21976039]
This study designed a CdSe/CdS core-shell quantum dots (QDs) fluorescent probe to rapidly and efficiently detect trace Cd2+ in aqueous solutions. The probe operates in an OFF-ON mode based on the adsorption and desorption reactions between ethylenediaminetetraacetic acid disodium salt (EDTA) and CdSe/CdS QDs, resulting in high detection sensitivity and accuracy.
The detection of heavy metals in aqueous solutions has always attracted much attention from all over the world. A fluorescent probe of CdSe/CdS core-shell quantum dots (QDs) was designed to detect trace Cd2+ in aqueous solutions using the OFF-ON mode rapidly and efficiently, likely based on adsorption and desorption reactions between ethylenediaminetetraacetic acid disodium salt (EDTA) and CdSe/CdS QDs. In the OFF mode, the optical shielding function of EDTA results in fluorescence quenching owing to the strong adsorption ability of EDTA with Cd2+ on the sites of CdSe/CdS QDs surface. In the ON mode, the introduction of Cd2+ promotes the desorption of EDTA from the EDTA-CdSe/CdS QDs and restores the fluorescence intensity. There were two linear response ranges which were 0.1-20 mu mol/L and 20-90 mu mol/L for the EDTA-CdSe/CdS system to detect Cd2+. The detection limit was 6 nmol/L, and the standard deviation was below 4% for the detection of Cd2+ concentration in tap water.
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