Carboxylate-intercalated layered double hydroxides aged under microwave-hydrothermal treatment
authors Benito, P; Labajos, FM; Mafra, L; Rocha, J; Rives, V
nationality International
journal JOURNAL OF SOLID STATE CHEMISTRY
author keywords Layered double hydroxide; Terephthalate; Ageing; Microwave
keywords HYDROTALCITE-LIKE COMPOUNDS; INTERLAYER ARRANGEMENT; ANION-EXCHANGE; TEREPHTHALATE; ZN; AL; SIMULATION; PRECURSORS; DYNAMICS; RELEASE
abstract Carboxylate-intercalated (terephthalate, TA and oxalate, ox) layered double hydroxides (LDHs) are aged under a microwave-hydrothermal treatment. The influence of the nature of the interlayer anion during the ageing process is studied. Characterization results show that the microwave-hydrothermal method can be extended to synthesize LDHs with anions different than carbonate, like TA. LDH-TA compounds are stable under microwave irradiation for increasing periods of time and the solids show an improved order both in the layers and in the interlayer region as evidenced by powder X-ray diffraction (PXRD), Al-27 MAS NMR and FT-IR spectroscopy. Furthermore, cleaning of the surface through removal of some organic species adsorbed on the surface of the particles also occurs during the microwave-hydrothermal treatment. Conversely, although the expected increase in crystallinity is observed in LDH-ox samples, the side-reaction between Al3+ and ox is also enhanced under microwave irradiation, and a partial destruction of the structure takes place with an increase in the M2+/M3+ ratio and consequent modification of the cell parameters. (C) 2008 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0022-4596
year published 2009
volume 182
issue 1
beginning page 18
ending page 26
digital object identifier (doi) 10.1016/j.jssc.2008.09.015
web of science category Chemistry, Inorganic & Nuclear; Chemistry, Physical
subject category Chemistry
unique article identifier WOS:000262546200003
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