Mochi Federico, Burratti Luca, Fratoddi Ilaria, Venditti Iole, Battocchio Chiara, Carlini Laura, Iucci Giovanna, Casalboni Mauro, De Matteis Fabio, Casciardi Stefano, Nappini Silvia, Pis Igor, Prosposito Paolo
Department of Industrial Engineering and INSTM, University of Rome, Tor Vergata, via del Politecnico 1, 00133 Rome, Italy.
Center for Regenerative Medicine, University of Rome Tor Vergata, Via Montpellier 1, 00133 Rome, Italy.
Nanomaterials (Basel). 2018 Jul 2;8(7):488. doi: 10.3390/nano8070488.
Silver nanoparticles capped with 3-mercapto-1propanesulfonic acid sodium salt (AgNPs-3MPS), able to interact with Ni or Co, have been prepared to detect these heavy metal ions in water. This system works as an optical sensor and it is based on the change of the intensity and shape of optical absorption peak due to the surface plasmon resonance (SPR) when the AgNPs-3MPS are in presence of metals ions in a water solution. We obtain a specific sensitivity to Ni and Co up to 500 ppb (part per billion). For a concentration of 1 ppm (part per million), the change in the optical absorption is strong enough to produce a colorimetric effect on the solution, easily visible with the naked eye. In addition to the UV-VIS characterizations, morphological and dimensional studies were carried out by transmission electron microscopy (TEM). Moreover, the systems were investigated by means of dynamic light scattering (DLS), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and high-resolution X-ray photoelectron spectroscopy (HR-XPS). On the basis of the results, the mechanism responsible for the AgNPs-3MPS interaction with Ni and Co (in the range of 0.5⁻2.0 ppm) looks like based on the coordination compounds formation.
已制备出用3-巯基-1-丙烷磺酸钠盐包覆的银纳米颗粒（AgNPs-3MPS），其能够与镍或钴发生相互作用，用于检测水中的这些重金属离子。该系统作为一种光学传感器，基于当AgNPs-3MPS存在于水溶液中的金属离子时，由于表面等离子体共振（SPR）导致的光吸收峰强度和形状的变化。我们对镍和钴的特定灵敏度可达500 ppb（十亿分之一）。对于1 ppm（百万分之一）的浓度，光吸收的变化足以在溶液中产生比色效应，肉眼很容易看到。除了紫外-可见光谱表征外，还通过透射电子显微镜（TEM）进行了形态和尺寸研究。此外，还通过动态光散射（DLS）、傅里叶变换红外光谱（FTIR）、X射线光电子能谱（XPS）和高分辨率X射线光电子能谱（HR-XPS）对该系统进行了研究。基于这些结果，AgNPs-3MPS与镍和钴（在0.5⁻2.0 ppm范围内）相互作用的机制似乎基于配位化合物的形成。
