Characterization and application of multicomponent nanoparticles in the immobilization of heavy metals water and liquid and solid mine tailings

Abstract:

Iron based nanoparticles have been used in remediation of solvent chlorides, PBCs, pesticides and heady metals at laboratory level (Liu & Zhao, 2007; Xiong et al., 2009; Zhao et al., 2009; Kim et al., 2011). However there are no studies of applications of nanoparticles to simultaneously remove several heavy metals. In this study multicomponent nanoparticles (Fe/FeSNPs) were synthesized using sodium sulfate, ferric chloride and sodium borohydride. Nanoparticles as prepared were characterized and used to remove a group of heavy metals from water and liquid ans solid mining tailings. Dynamic light scattering, transmission electron microscopy, infrared spectrophotometry, X-ray diffraction, and X-ray photoelectron spectrometry were used to characterize nanoparticles. Average size of the spheres is 30 nm. FTIR spectrum of a sample of nanoparticles after removal of Cu2+ shows changes on peaks that imply the existence of residual hydroxyl groups on the surface of Fe/FeS nanoparticles. The latter mechanism may promote the formation of complex of Sur-OH-Cu2+ and Sur-O-Cu2+ during the adsorption of Cu2+.. A XRD spectrum provides Fe peaks and amorphous content of FeS. In addition, XPS spectra give peaks of Fe2p2/3 and Fe2p1/2, they show a decrease of binding energy after contacting the Fe/FeSNPs with Cu2+(Cumbal et at., 2014) and peaks of Cu2p1/2 and Cu2p3/2 show CuO formation. Removal tests were performed contacting the multicomponent nanoparticles with acidic contaminated water and soils. For artificial water samples, heavy metals were removed in more than 95%. Kinetic tests conducted under aerobic environment …

Año de publicación:

2015

Keywords:

Fuente:

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