مرجـع دانـش پارس

نوع فایل:PDF

تعداد صفحات :7

سال انتشار : 1394

چکیده

In recent years, the spinel ferrite nanoparticles due to various applications in both fundamental and have been a lot of interest. In this work, magnetic (Fe3O4) nanoparticles chloride salts deposited using both two-and trivalent manganese and iron were produced in an alkaline environment. The surface layer of silica nanoparticles with improved chemical stability and improved dispersion in the reaction medium were covered. Where the hydrolysis of Tetraethyl orthosilicate (TEOS) was used, which effectively bind with the outer surface of the magnetic nanoparticles and the cover them. In the next part of this investigation the nanoparticle surface by 3- amino propyl trimethoxy silane (APTMS), and finaly folic acid (FA) was conjugated to nanoparticles modified by amide bonds. Absorbent were prepared and used forremoval of heavy metal ions. Characteristics of absorbent produced by Scanning Electron Microscope (SEM), elemental analysis (EDAX), X-ray diffraction (XRD), infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM) and analysis of analyzed. The binding of folic acid to the nanoparticles was confirmed by FT-IR analysis. The magnetic properties of the nanoparticles were determined using VSM results indicate that the properties of superparamagnetic nanoparticles was produced, The present findings show that this nano absorbentfor removal of heavy metal ions from aqueous solutions

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