Ultra-sensitive detection of mercury(II) ions in water sample using gold nanoparticles synthesized by Trichoderma harzianum and their mechanistic approach
Ultra-sensitive detection of mercury(II) ions in water sample using gold nanoparticles synthesized by Trichoderma harzianum and their mechanistic approach
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DOI：
10.1016/j.snb.2014.08.015
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发表时间：
2014-12-01
影响因子：
8.4
通讯作者：
Shrivastav, B. R.
中科院分区：
文献类型：
--
作者：
Tripathi, R. M.;Gupta, Rohit Kumar;Shrivastav, B. R.
本研究展示了一种简单、成本有效和选择性的比色检测汞（II）离子的方法，该方法使用由非致病性和农业上可观的哈茨木霉（T. harzianum）。采用紫外-可见光谱（UV-vis）、动态光散射（DLS）、透射电子显微镜（TEM）、X射线能量色散谱（EDX）、傅里叶变换红外光谱（FTIR）和X射线衍射（XRD）对合成的纳米粒子进行了表征。所合成的金纳米粒子被进一步用于Hg 2+离子的选择性光学检测。金纳米粒子溶液的颜色在Hg 2+离子的存在下发生变化，并且即使在微小浓度的Hg 2+离子下也观察到纳米粒子的表面等离子体共振（SPR）的实质性变化。在Pb 2+、Zn 2+、Cd 2+、Fe 3+、Ni 2+、Ca 2+、Mn 2+、Al 3+、Co2+和Na+离子存在下，分析了AuNPs对Hg 2+离子的灵敏度和选择性。本文还沿着讨论了汞离子的比色检测机理。(C)2014爱思唯尔有限公司版权所有。
The present study demonstrates a simple, cost effective and selective method for colorimetric detection of mercury(II) ions using gold nanoparticles (AuNPs) synthesized by non-pathogenic and agriculturally considerable fungal biomass of Trichoderma harzianum (T. harzianum). The synthesized nanoparticles were characterized by UV-vis spectroscopy (UV-vis), dynamic light scattering (DLS), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). The as-synthesized AuNPs were used further for the selective optical detection of Hg2+ ions. The color of AuNPs solution changes in the presence of Hg2+ ions and also a substantial change in the surface plasmon resonance (SPR) of nanoparticles was observed even at minute concentration of Hg2+ ions. The sensitivity and selectivity of AuNPs towards Hg2+ ions was also analyzed in the presence of Pb2+, Zn2+, Cd2+, Fe3+, Ni2+, Ca2+, Mn2+, Al3+, Co2+ and Na+ ions. The mechanism of colorimetric detection of Hg2+ ions was also discussed along with diagrammatic representation. (C) 2014 Elsevier B.V. All rights reserved.