caa a22 4500 606195173 CHVBK 20210128100918.0 cr unu---uuuuu 210128e20150601xx s 000 0 eng 10.1007/s10934-015-9946-4 doi (NATIONALLICENCE)springer-10.1007/s10934-015-9946-4 Aminopropyl-modified mesoporous silica nanospheres for the adsorption of Cr(VI) from water [Elektronische Daten] [N. Fellenz, P. Martin, S. Marchetti, F. Bengoa] Aminopropyl-functionalized mesoporous silica spherical particles were obtained through post-synthetic route. The suitability of this material as an adsorbent for heavy metals from aqueous media was tested by Cr(VI) adsorption experiments performed at various pH conditions, chromium concentrations and time. The synthesized particles were characterized before and after functionalization by X-ray diffraction at low angles, nitrogen adsorption-desorption isotherms, infrared Fourier transform spectroscopy, scanning electron microscopy and thermogravimetric analysis. It was found that Cr(VI) adsorption occurs more efficiently in the pH range between 2 and 3. As a consequence of the nanometer scale of the particles, concentration profiles do not develop inside of them and thus there are no diffusional restrictions within the pores, leading to a higher Cr(VI) adsorption than that previously reported for similar systems. Chromium desorption for material reutilization was carried out in basic media. Results showed that the amino groups were grafted successfully without mesostructure damage. These groups are essential for the metal ion removal and no significant leaching was observed after fouruse/regeneration/use cycles. The batch equilibrium data fitted well the Langmuir isotherm with a maximum adsorption capacity of 87.1mgg−1 at 25°C. A discussion about the relationship between structure and its behavior as adsorbent, including regeneration and reusability, is given. Springer Science+Business Media New York, 2015 Ordered mesoporous silica nationallicence Spherical particles nationallicence Amino-functionalization nationallicence Adsorption nationallicence Hexavalent chromium nationallicence Fellenz N. Universidad Nacional de Rio Negro, CONICET, Belgrano 526, 8500, Viedma, Rio Negro, Argentina aut Martin P. Universidad Nacional de Rio Negro, CONICET, Belgrano 526, 8500, Viedma, Rio Negro, Argentina aut Marchetti S. Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CINDECA, CICPBA, 47 No 257, 1900, La Plata, Argentina aut Bengoa F. Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CINDECA, CICPBA, 47 No 257, 1900, La Plata, Argentina aut Journal of Porous Materials Springer US; http://www.springer-ny.com 22/3(2015-06-01), 729-738 1380-2224 22:3<729 2015 22 10934 https://doi.org/10.1007/s10934-015-9946-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10934-015-9946-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Fellenz N. Universidad Nacional de Rio Negro, CONICET, Belgrano 526, 8500, Viedma, Rio Negro, Argentina aut NATIONALLICENCE 700 1- Martin P. Universidad Nacional de Rio Negro, CONICET, Belgrano 526, 8500, Viedma, Rio Negro, Argentina aut NATIONALLICENCE 700 1- Marchetti S. Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CINDECA, CICPBA, 47 No 257, 1900, La Plata, Argentina aut NATIONALLICENCE 700 1- Bengoa F. Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CONICET, CINDECA, CICPBA, 47 No 257, 1900, La Plata, Argentina aut NATIONALLICENCE 773 0- Journal of Porous Materials Springer US; http://www.springer-ny.com 22/3(2015-06-01), 729-738 1380-2224 22:3<729 2015 22 10934