Cysteine-functionalized silica-coated magnetite nanoparticles as potential nanoadsorbents

Cysteine-functionalized silica-coated magnetite nanoparticles as potential nanoadsorbents

Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2@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...

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Bibliographic Details
Published in:Journal of solid state chemistry Vol. 253; pp. 318 - 328
Main Authors: Enache, Daniela F., Vasile, Eugenia, Simonescu, Claudia M., Răzvan, Anca, Nicolescu, Alina, Nechifor, Aurelia-Cristina, Oprea, Ovidiu, Pătescu, Rodica-Elena, Onose, Cristian, Dumitru, Florina
Format: Journal Article
Language:English
Published: Elsevier Inc 01-09-2017
Subjects:
Cysteine
Functionalization
Heavy metal ions
ICPTES
Magnetite nanoparticles
Nanoadsorbents
Silanization
Magnetite nanoparticles
Heavy metal ions
Cysteine
Functionalization
Nanoadsorbents
Silanization
ICPTES
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Summary:Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2@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 Fe3O4, Fe3O4@SiO2 and Fe3O4@SiO2@ICPTES-cysteine nanoparticles are all of spherical shape with particle of ca. 10–30nm diameters and the silica-coated magnetites have a core-shell structure. Fe3O4, Fe3O4@SiO2, and Fe3O4@SiO2@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. Fe3O4@SiO2@ICPTES-cysteine, with a sorption capacity of 81.8mg Pb(II)/g, has the potential to be an efficient Pb(II) adsorbent. Fe3O4@SiO2@ICPTES-cysteine nanoparticles have been synthesised through a four-step functionalization process: synthesis of Fe3O4 MNPs, coating with SiO2, functionalization with ICPTES, and the covalent grafting of cysteine onto these MNPs. [Display omitted]
ISSN:0022-4596
1095-726X
DOI:10.1016/j.jssc.2017.06.013