期刊
APPLIED CLAY SCIENCE
卷 53, 期 4, 页码 615-620出版社
ELSEVIER
DOI: 10.1016/j.clay.2011.05.011
关键词
Layered double hydroxides; Threonine; Intercalation; Characterization
资金
- National Science Foundation of China [41073058, 40973075, 40730741]
- New Century Excellent Talents Program
- Ministry of Education, China [NCET-06-0747]
- Science and Technology Plan of Guangdong Province, China [2006836601004, 2008830302036, 2009B050900005]
- Natural Science Foundation of Guangdong Province, China [06025666, 9351064101 000001]
- Fundamental Research Funds for the Central Universities
- SCUT [2009ZZ0048, 2009ZZ0073, 2009ZM0202]
- Research Fund for the Doctoral Program of Higher Education of China [20100172110028]
The precursors of Mg-Al layered double hydroxides (LDHs) were synthesized and threonine (Thr) was incorporated into LDHs via ion exchange procedure. XRD and low-angle XRD demonstrate that Thr anions have been inserted into the layers. Molecular model is built up to present the possible arrangement and orientation of the intercalated substances based on XRD patterns. IR and Raman spectroscopy are applied to illustrate the characteristic changes in functional groups. After intercalation, with full elemental analysis and X-ray Photoelectron Spectroscopy (XPS) for N 1s detecting, the nitrate/Thr molar ratio is 1:5, and the empirical formula is [Mg0.758Al0.242(OH)(2)](C4H9NO3)(0.202)(NO3)(0.0403) center dot 1.24H(2)O. Measurement of TGA-DTA pictures the weight loss regions to exhibit the composition structure of LDHs. Detected by C-13 MAS NMR spectra, it is supposedly verified that Thr anions are linked to the layers with its axis due to the ionic interaction between -COO- and cationic layers. (C) 2011 Elsevier B.V. All rights reserved.
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