Cysteine-functionalized silica-coated magnetite nanoparticles as potential nanoadsorbents
| Autor: | Claudia Maria Simonescu, Aurelia Cristina Nechifor, Anca Razvan, Cristian Onose, Ovidiu Oprea, Daniela F. Enache, Eugenia Vasile, Rodica-Elena Pătescu, Florina Dumitru, Alina Nicolescu |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Inorganic chemistry Nanoparticle 02 engineering and technology 010402 general chemistry 01 natural sciences Inorganic Chemistry Metal chemistry.chemical_compound Adsorption Materials Chemistry Physical and Theoretical Chemistry High-resolution transmission electron microscopy Aqueous solution Sorption 021001 nanoscience & nanotechnology Condensed Matter Physics Isocyanate 0104 chemical sciences Electronic Optical and Magnetic Materials chemistry visual_art Silanization Ceramics and Composites visual_art.visual_art_medium 0210 nano-technology Nuclear chemistry |
| Zdroj: | Journal of Solid State Chemistry. 253:318-328 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/j.jssc.2017.06.013 |
| Popis: | Fe 3 O 4 , Fe 3 O 4 @SiO 2 , and Fe 3 O 4 @SiO 2 @ICPTES-cysteine MNPs have been prepared by the deposition of silica onto magnetite nanoparticles via controlled hydrolysis of TEOS. The new formed silica surface has been functionalized by grafting 3-(triethoxysilyl) propyl isocyanate (ICPTES) and, subsequently, by condensation of isocyanate moiety with cysteine. The morphology of magnetic silica nanoparticles has been investigated by FTIR, PXRD, TEM-HRTEM/SEM/EDX as well as TG experiments. HRTEM microscopy revealed that the Fe 3 O 4 , Fe 3 O 4 @SiO 2 and Fe 3 O 4 @SiO 2 @ICPTES-cysteine nanoparticles are all of spherical shape with particle of ca. 10–30 nm diameters and the silica-coated magnetites have a core-shell structure. Fe 3 O 4 , Fe 3 O 4 @SiO 2 , and Fe 3 O 4 @SiO 2 @ICPTES-cysteine MNPs have been tested for their sorption capacity of Pb(II) from synthetic aqueous solutions and the influence of pH solution, contact time, initial heavy metal ion concentrations, and adsorption isotherms on the sorption behavior were also studied. The kinetic studies revealed that the Pb(II) sorption process is mainly controlled by chemical mechanisms. Fe 3 O 4 @SiO 2 @ICPTES-cysteine, with a sorption capacity of 81.8 mg Pb(II)/g, has the potential to be an efficient Pb(II) adsorbent. |
| Databáze: | OpenAIRE |
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