Artículos de revistas
A new approach for mesoporous carbon organofunctionalization with maleic anhydride
Registro en:
Microporous And Mesoporous Materials. Elsevier Science Bv, v. 165, n. 168, n. 176, 2013.
1387-1811
WOS:000311070500025
10.1016/j.micromeso.2012.08.023
Autor
Almeida, RKS
Melo, JCP
Airoldi, C
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Mesoporous carbon replicas CMK-3 and CMK-n were organofunctionalized with maleic anhydride by a new and simple methodology. These materials have been characterized by nuclear magnetic resonance (NMR), infrared (IR), Raman and X-ray photoelectron (XPS) spectroscopies, thermogravimetry, small-angle X-ray diffraction, nitrogen sorption and transmission electron microscopy (TEM). The attachment of maleic anhydride was confirmed by C-13 NMR, which showed a peak at 168 ppm, assigned to the carbonyl of maleic anhydride, as well as by the new band at 1728 cm(-1) attributed by IR to carbonyl groups. Increased amounts of this group were also demonstrated by C1s and O1s XPS spectra. The surface area, pore volume and pore size decreased after organofunctionalization. Small-angle X-ray diffractometry. nitrogen sorption and TEM data confirm that mesostructures of carbons were maintained even after organofunctionalization, in which the set of CMK-3 and CMK-n carbons have a 2D-hexagonal structure and domains of 3D-cubic, respectively. An interesting feature from Raman spectroscopy is the degree of graphitic order for mesoporous carbons that increased after reaction with maleic anhydride, where the D and G intensity ratios decreased from 2.6 to 1.9 for CMK-3 and from 2.3 to 2.0 for the CMK-n carbons. (C) 2012 Elsevier Inc. All rights reserved. 165 168 176 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)