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Acid Treatment of Layered Double Hydroxides Containing Carbonate
Author(s) -
Hibino Toshiyuki
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402372
Subject(s) - crystallinity , chemistry , hydroxide , layered double hydroxides , dissolution , carbonate , inorganic chemistry , ion exchange , metal hydroxide , aqueous solution , chloride , nuclear chemistry , ion , organic chemistry , crystallography
Carbonate‐containing Mg–Al layered double hydroxides (LDHs) with two different crystallinities were treated with acidic solutions that contain Cl – . Upon treatment with an acetate buffer/NaCl aqueous solution, low‐crystallinity LDH consumed more protons for dissolution of the metal hydroxide layers than did high‐crystallinity LDH, and it showed a lower extent of exchange of interlayer anions for Cl – than high‐crystallinity LDH. Varying washing procedures also resulted in differences in the characteristics of the washed products, such as the presence of Al(OH) 3 and the extent of exchange for Cl – . When chloride‐containing LDHs were dispersed in water, Mg hydroxide species in the LDHs were found to be dissolved to some extent even in water, and Cl – ions in the LDHs were replaced with OH – ions that were formed by the dissolution.