Artículos de revistas
Calcium phenylphosphonate as a host for 4-aminobenzoic acid-Synthesis, characterization, and cation adsorption from ethanol solution
Registro en:
Materials Research Bulletin. Pergamon-elsevier Science Ltd, v. 44, n. 11, n. 2087, n. 2091, 2009.
0025-5408
WOS:000271370400008
10.1016/j.materresbull.2009.07.014
Autor
Lazarin, AM
Ganzerli, TA
Sernaglia, RL
Andreotti, EIS
Airoldi, C
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Crystalline lamellar calcium phenylphosphonate retained 4-aminobenzoic acid inside its cavity without leaching. The intense infrared bands in the 1160-695cm(-1) interval confirmed the presence of the phosphonate groups attached to the inorganic layer, with sharp and intense peaks in X-ray diffraction patterns, which gave basal distances of 1532 and 1751 pm for the original and the intercalated compounds, respectively. The thermogravimetric curves of both layered compounds showed the release of water molecules and the organic moiety in distinct stages, to yield a final Ca(PO(3))(2) residue. Solid-state (31)P nuclear magnetic resonance spectra presented only one peak for the phenylphosphonate groups attached to the main inorganic polymeric structure near 12.4 ppm. The adsorption isotherms from ethanol gave the maximum adsorption capacities of 1.68 and 0.50 mmol g(-1) for copper and cobalt, respectively, whose average stability constants followed Co > Cu; the number of ligands was determined as four for both cations. (C) 2009 Elsevier Ltd. All rights reserved. 44 11 2087 2091 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)