Journal
CHEMICAL ENGINEERING JOURNAL
Volume 144, Issue 1, Pages 124-137Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2008.06.031
Keywords
Layered double hydroxides; Morphosynthesis; Sheet flexibility; In situ transformation of interlayer anions
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Funding
- NSFC
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0406]
- Program for New Century Excellent Talents in University [NCET-04-0119]
- 111 Project [B07004]
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The sheet flexibility of layered double hydroxides (LDHs) has been investigated experimentally using coprecipitation and urea hydrolysis methods in an aqueous solution of long-chain anion surfactant in this work. Using dodecylsulfate (DS) anion as morphology-controlling agent, layer-bended or contorted Mg/Al-LDH is obtained successfully. The morphology of bent layers is retained during either in situ decomposition of interlayer DS to SO42- or ion exchange of interlayer DS by CO32-. The direct synthesis of the layer-distorted LDHs intercalated with small inorganic anions is quite difficult. It has been achieved using layer-bended LDHs pillared with bulky organic anions as precursors in this paper. The morphosynthesis is expanded to Co/Al and Ni/Al-LDHs, indicative of the general flexibility of this kind of anionic clays. (C) 2008 Elsevier B.V. All rights reserved.
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