有机酸辅助绿色合成纳米银在溶剂和固膜状态下的比色鉴别Pd2+和Hg2+离子

IF 0.8 4区 化学 Q4 SPECTROSCOPY Spectroscopy Pub Date : 2022-12-01 DOI:10.56530/spectroscopy.ag1869d9
Kaiyu Zhang, Yuxin Sang, Qinxing Sun, Weina Li
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引用次数: 0

摘要

在本研究中,研究了在一个银纳米粒子(AgNPs)传感系统中,溶剂态和固膜态的Pd2+和Hg2+离子的比色鉴别。首先,在壳聚糖和不同有机酸(乙酸、丙二酸和柠檬酸)的存在下,用硼氢化钠还原AgNO3制备纳米银。不同有机酸的加入可以调节AgNPs的表面等离子体共振(SPR)强度和尺寸分布。壳聚糖作为稳定剂和络合剂,使AgNPs具有优良的成膜性能。然后,利用壳聚糖稳定的AgNPs在溶剂和固膜状态下检测金属离子。在Hg2+和Pd2+离子存在下,AgNP溶液的颜色由淡黄色迅速转变为无色和浅棕色。添加Hg2+和Pd2+离子后,AgNPs的SPR特征峰完全消失,由黄褐色的固体膜也迅速转变为无色和深褐色。在溶剂态和固膜态均能明显观察到Hg2+和Pd2+离子的区分。然而,其他金属离子的加入不能改变AgNPs的颜色。
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Colorimetric Discrimination of Pd2+ and Hg2+ Ions in Solvent and Solid-Film State Using Organic Acid-Assisted Green Synthesized Silver Nanoparticles
In this study, a colorimetric discrimination of Pd2+ and Hg2+ ions in the solvent and solid film states in one silver nanoparticles (AgNPs) sensing system is presented. First, silver nanoparticles were prepared by reducing AgNO3 with sodium borohydride in the presence of chitosan and different organic acids, including acetic acid, propanedioic acid, and citric acid. The addition of different organic acids allowed for the surface plasmon resonance (SPR) intensity and size distribution of AgNPs to be adjusted. Chitosan acts as a stabilizer and complexing agent, endowing AgNPs excellent film-forming properties. Then, the chitosan-stabilized AgNPs in the solvent and solid-film state are used to detect metal ions. In the presence of Hg2+ and Pd2+ ions, the color of the AgNP solution changed rapidly from pale yellow to colorless and light brown, respectively. The characteristic SPR peaks of the AgNPs also disappeared completely, and the solid films of AgNPs with a yellowish-brown color also change rapidly to colorless and dark brown with the addition of Hg2+ and Pd2+ ions, respectively. The discrimination of Hg2+ and Pd2+ ions can be clearly observed in both the solvent and the solid film state. However, the addition of other metal ions cannot change the color of the AgNPs.
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来源期刊
Spectroscopy
Spectroscopy 物理-光谱学
CiteScore
1.10
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审稿时长
3 months
期刊介绍: Spectroscopy welcomes manuscripts that describe techniques and applications of all forms of spectroscopy and that are of immediate interest to users in industry, academia, and government.
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