化学
掩蔽剂
水溶液
试剂
胶体金
水溶液中的金属离子
检出限
Mercury(编程语言)
无机化学
纳米颗粒
离子
核化学
色谱法
纳米技术
物理化学
有机化学
材料科学
计算机科学
程序设计语言
作者
Xigui Liu,Danlian Huang,Cui Lai,Chen Zhang,Lei Qin,Bisheng Li,Huan Yi,Rui Deng,Shiyu Liu,Mingming Zhang,Lei Lei,Yukui Fu,Ling Li
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2021-07-02
卷期号:4 (7): 6760-6767
被引量:16
标识
DOI:10.1021/acsanm.1c00809
摘要
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.
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