Exfoliation of kaolinite by urea-intercalation precursor and microwave irradiation assistance process |
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| Authors: | Pi Zhenbang Liu Zhuoqin Yang Chao Tian Xike Fei Jinbo and Zheng Jianhua |
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| Institution: | (1) Faculty of Material Science and Chemical Engineering, China University of Geosciences, Wuhan, 430074, China |
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| Abstract: | A type of exfoliated kaolinite was produced by urea-intercalation and original microwave irradiation assisted method. The
product was investigated by Fourier transformation infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), scanning electronic
microscopy (SEM), Brunauer-Emmett-Teller (BET) and laser particle analysis techniques. FT-IR spectra show that NHCO molecule
exists in the intercalated kaolinite. XRD analyses indicate that the kaolinite sheet-like structure was disordered after microwave
irradiation. The urea decomposition process and explosion effect between the sheet-like structures of kaolinite under microwave
irradiation were discussed. The SEM and BET analyses reveal that the end product is exfoliated kaolinite with thin particles
and increased surface area. Size and zeta potential analyses show that the particle size distribution is between 250 nm and
550 nm with normal distribution and the particle is negatively charged. In comparison with the conventional grind method,
the process adopted appears to be economic and the exfoliated kaolinite end product may display a significantly enhanced performance
in industrial applications. |
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| Keywords: | exfoliated kaolinite microwave irradiation intercalation |
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