Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/78341
Type: Artigo de periódico
Title: Calcium phenylphosphonate as a host for 4-aminobenzoic acid-Synthesis, characterization, and cation adsorption from ethanol solution
Author: Lazarin, AM
Ganzerli, TA
Sernaglia, RL
Andreotti, EIS
Airoldi, C
Abstract: 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.
Subject: Layered compounds
Intercalation reactions
X-ray diffraction
Infrared spectroscopy
Surface properties
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/j.materresbull.2009.07.014
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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