Journal
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
Volume -, Issue 31, Pages 5311-5321Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejic.201402372
Keywords
Layered compounds; Ion exchange; Anions; Acidity; Crystallinity
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Funding
- Japan Society for the Promotion of Science (KAKENHI Grant) [24510115]
- Grants-in-Aid for Scientific Research [24510115] Funding Source: KAKEN
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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.
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