Facile and on-line colorimetric detection of Hg2+based on localized surface plasmon resonance (LSPR) of Ag nanotriangles.
Facile and on-line colorimetric detection of Hg2+based on localized surface plasmon resonance (LSPR) of Ag nanotriangles.
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DOI：
10.1016/j.talanta.2018.09.079
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发表时间：
2019-01
期刊：
影响因子：
6.1
通讯作者：
Amirmostafa Amirjani;D. Haghshenas
中科院分区：
文献类型：
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作者：
Amirmostafa Amirjani;D. Haghshenas
本研究成功地建立了一种快速、灵敏的汞离子比色检测方法。柠檬酸官能化的银纳米三角形（AgTrngs）通过一锅硼氢化钠法合成，边长范围为30 - 40 nm。使用UV-维斯分光光度法、透射电子显微镜（TEM）、能量分散光谱（EDS）和X-射线衍射仪对所获得的AgTrngs进行充分表征。由于H+离子在酸性条件下对Hg ~（2+）的干扰作用，该传感器在pH= 8时效率最佳。在10 nmol L−1-50 μmol L− 1浓度范围内成功检测水溶液中的汞，表明所开发的传感器可用于有效监测和控制工业废水中的Hg 2+水平。Hg 2+离子与Ag相互作用并在AgTrngs表面形成Hg−Ag合金（汞齐）的能力导致了从蓝色到紫色的明显颜色变化。紫外-维斯分光光度法表明，传感器的检测限（LOD）值低至4 nmol L-1，低于饮用水中Hg 2+离子的安全水平（10 nmol L-1）。该方法可用于复杂水溶液中Hg ~（2+）的在线测定。
A rapid and sensitive colorimetric detection method for the determination of Hg2+has been successfully developed in this research. Citrate−functionalized silver nanotriangles (AgTrngs) were synthesized via one−pot sodium borohydride method with the edge−length range of 30 − 40 nm. The obtained AgTrngs were fully characterized using UV−Vis spectrophotometry, transmission electron microscopy (TEM), energy dispersed spectroscopy (EDS) and X−ray diffractometer. The efficiency of the developed sensor was optimum at pH= 8 due to interfering effect of H+ions for Hg2+under acidic conditions. The successful detection of mercury in aqueous solutions in the concentration range of 10 nmol L−1–50 μmol L−1indicated the applicability of the developed sensor for effective monitoring and controlling the level of Hg2+in industrial effluents. The ability of Hg2+ion to interact with Ag and form the Hg−Ag alloy (amalgam) over the surface of AgTrngs resulted in an obvious color change from blue to violet. UV−Vis spectrophotometry showed that the sensor has the limit of detection (LOD) value of as low as 4 nmol L−1which was below the safety level of Hg2+ions (10 nmol L−1) in drinking water. The proposed method can be used for on−line determination of Hg2+in the complex aqueous solutions.