Layered double hydroxides with interlayer borate anions: A critical evaluation of synthesis methodology and pH-independent orientations in nano-galleries
authors Ay, AN; Zumreoglu-Karan, B; Temel, A; Mafra, L
nationality International
journal APPLIED CLAY SCIENCE
author keywords Layered double hydroxides; Hydrotalcite-like compounds; Intercalation; Pillaring; Borate ions
keywords HYDROTALCITE-LIKE COMPOUNDS; MG-AL RATIO; BORON REMOVAL; INTERCALATION CHEMISTRY; CYCLOHEXANONE-OXIME; NMR-SPECTROSCOPY; EXCHANGE; TEREPHTHALATE; COORDINATION; ADSORPTION
abstract Borate anions supplied by boric acid and ammonium tetraborate solutions were intercalated into Mg-Al-A-layered double hydroxides, where A=nitrate, adipate or terephtalate, by co-precipitation and ion exchange methods at varying pH values. Elemental analyses, powder X-ray diffraction, and FUR spectra indicated that borate ion intercalating LDHs were succesfully produced by both methods. Well-textured materials were obtained by an ion-exchange technique particularly upon exchange with tetraborate solutions at pH 9. (27)Al MAS NMR studies showed that the layers retained their integrity during the exchange process although there were variations in composition and crystallinity. The nature of the intercalated borate species was deduced from (11)B MAS NMR data. The results showed that independently of the applied pH, observation of signals from both of BO(3) and BO(4), groups was consistent in all cases. The anions were intercalated as polyborate units like [B(3)O(3)(OH)(4)](-) or [B(4)O(5)(OH)(4)](2-), even at pH 12 where the monoborate anions, [B(OH)(4)](-), are expected to exist dominantly. (c) 2010 Elsevier B.V. All rights reserved.
publisher ELSEVIER SCIENCE BV
issn 0169-1317
year published 2011
volume 51
issue 3
beginning page 308
ending page 316
digital object identifier (doi) 10.1016/j.clay.2010.12.015
web of science category Chemistry, Physical; Materials Science, Multidisciplinary; Mineralogy
subject category Chemistry; Materials Science; Mineralogy
unique article identifier WOS:000287893000014
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