Synthesis and characterization of layered double hydroxides with a high aspect ratio |
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Authors: | Qi Tao Yuanming Zhang Xiang Zhang Hongping He |
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Institution: | a Department of Chemistry, Institute of Nano-Chemistry, Jinan University, Guangzhou 510632, China b Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China |
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Abstract: | A new route for synthesis of Mg/Al layered double hydroxide (Mg6Al2(OH)16(CO3)·4H2O) has been introduced, which can be considered as a modified calcination-rehydration method. Under the hydrothermal conditions, LDHs with a high aspect ratio were synthesized and characterized by inductively coupled plasma-atom emission spectrometer (ICP-AES), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), thermal measurement (TG-DTG) and scanning electron microscopy (SEM). XRD patterns display the crystalline enhanced with the increase of hydrothermal temperature and aging time. TG-DTG curves show the more stable LDHs were synthesized at higher temperature. SEM images indicate the lateral size of the synthesized LDHs locates at ca. 1-6 μm and the thickness at ca. 35-60 nm. And the particle size depends strongly on the treatment temperature and aging time. A buffer solution consisted of HCO3− and CO32− keeps the pH of reaction system in a certain range and offers a low supersaturated reaction circumstance. This is of high importance for the formation of LDHs with a high aspect ratio. |
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Keywords: | Layered double hydroxides Calcination-rehydration method High aspect ratio Hydrothermal treatment Scanning electron microscopy |
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