| Autor: |
Lei Lei, Huan Yi, Xigui Liu, Danlian Huang, Chen Zhang, Shiyu Liu, Cui Lai, Lei Qin, Bisheng Li, Mingming Zhang, Ling Li, Rui Deng, Yukui Fu |
| Rok vydání: |
2021 |
| Předmět: |
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| Zdroj: |
ACS Applied Nano Materials. 4:6760-6767 |
| ISSN: |
2574-0970 |
| DOI: |
10.1021/acsanm.1c00809 |
| Popis: |
A facile visual strategy is presented for specific identification of mercury ions (Hg2+) in an aqueous environment based on the competitive interactions of 2-thiobarbituric acid (TBA) with Au nanoparticles (AuNPs) and Hg2+. This approach depends on the unique optical performance of AuNPs and the sulfophile affinity of AuNPs and Hg2+. With the addition of TBA, AuNPs aggregate because of the ligand exchange between surface-loaded citrate ions of AuNPs and the thiol group of TBA, which induces a red shift in the absorption spectrum, and the color changes to blue from wine red. However, the added Hg2+ in advance can restrain the agglomeration of AuNPs induced by TBA since the mercaptan group is more likely to react with Hg2+ than AuNPs through the formation of Hg2+ sulfur. Based on the competitive interactions of TBA with AuNPs and Hg2+, the method can specifically detect Hg2+ in the absence of masking reagents without reacting with the major interfering metal ions including Cu2+, Pb2+, and Cd2+ compared to previous studies. Moreover, the detection limit of this original method can be as low as 2.4 nM, and it can be effectively used for Hg2+ detection in environmental aqueous samples. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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