期刊
APPLIED CLAY SCIENCE
卷 35, 期 3-4, 页码 218-227出版社
ELSEVIER
DOI: 10.1016/j.clay.2006.08.011
关键词
LDH; layered double hydroxide; hydrotalcite; hydration; interstratification; second staging
The hydration of layered double hydroxides (LDHs) was investigated by changing the interlayer anion species, the Mg/Al ratio of the LDH hosts and the relative humidity (RH). The anions were CO32-, Cl-, Br-, NO3-, I-, S-O(42)-, and ClO4- (listed in the order of ion size, small to large) and LDHs with Mg/Al = 1.90 (LDH2) and 2.91 (LDH3) were used. Their XRD profiles were measured by an XRD diffractometer while controlling the RH in the range 0-95% at 25 degrees C. Only I-, SO42-, and ClO4- LDH2s and SO42- LDH3 showed a large step-wise basal-spacing expansion, 0.24-0.28 nm, under high RH conditions (> ca. 60%) probably due to the insertion of one water layer into the interlayer space. Such hydration occurred more favorably for the LDHs with larger anions and those with a higher layer charge (LDH2). Among them, I- and ClO4- LDH2s exhibited the second staging - alternate stacking of hydrated (H) and non-hydrated (NH) interlayers - in the intermediate RH region. (C) 2006 Elsevier B.V. All rights reserved.
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