مشخصات پژوهش

In this study, a sufficient nanostructure sorbent was produced via Fe3O4 magnetic meso-poroussilica and cetyltrimethylam monium bromide (CTAB) as surfactant sample by using a sol–gel technique. To improve the adsorption performance, the magnetic nanostructure was further optimized with bis(3-triethoxysilylpropyl)tetrasulfide. Characterization of the prepared magnetic nanoparticles adsorbents was performed by Fourier transform infrared (FT-IR), Scanning electron microscope (SEM), and Vibrating sample magnetometry (VSM). Modified magnetic nanoparticles as a new nanoparticle were prepared and used as a solid-phase extraction (SPE) adsorbent for extraction and pre-concentration of gold and silver ions from various samples. After adsorption, gold and silver ions were desorbed with the use of nitric acid followed by flame atomic absorption spectrometric determination. The linear range 2.0–400.0 ng mL─1 and 3.0–500.0 ng mL─1 with detection limit of 0.7 ng mL─1 and 0.4 ng mL─1 for gold and silver were obtained. The relative standard deviations of the method for eight replicate determination of 200 ng mL─1 of gold and silver were obtained as 1.1 and 1.3%, respectively. Furthermore, Molecu lar Dynamics (MD) approach used as computational method to adsorption process analyzing of porous silica and Au3+ and Ag1+ ions. Computational outputs verified laboratory analyzing and shows using porous silica matrix can be regarded as a promising system to Au3+ and Ag1+ ions adsorption process in actual cases.