期刊
VIBRATIONAL SPECTROSCOPY
卷 70, 期 -, 页码 63-69出版社
ELSEVIER
DOI: 10.1016/j.vibspec.2013.11.007
关键词
Vermiculite; Acid treatment; Elemental analysis; XRD analysis; IR spectroscopy; Raman spectroscopy
资金
- Czech Science Foundation [P210/11/2215]
- Regional Materials Science and Technology Centre [CZ.1.05/2.1.00/01.0040]
- state budget of the Czech Republic and IT4Innovations Center of Excellence [cz.1.05/1.1.00/02.0070]
The natural vermiculites from different localities (Bulgaria, Brazil, and South Africa) after acid treatment were used for this study. Differently acidified vermiculite samples were prepared from the natural vermiculite sample using different concentrations of hydrochloric acid (0.5 M and 1 M) and different reaction time (2h and 4h) at 80 degrees C. Natural vermiculites and acid treated vermiculites were analyzed by elemental analysis, X-ray diffraction (XRD) analysis and studied using Fourier transform infrared (FOR) spectroscopy and dispersive Raman spectroscopy. According to the XRD analysis vermiculites are interstratified structures created in the different two-one-zero sheet hydrated phases. Ratio of intensities of spectrally deconvoluted bands at 1075 cm(-1) and 1000 cm(-1) (stretching vibration of Si-O bonds of vermiculites and stretching vibration of Si-O bonds of amorphous silica, respectively) was used to determine the content of amorphous silica in acid treated vermiculite samples. Study of the infrared and Raman spectra of the acidified vermiculites enable a comparison of these two spectroscopic data that have not yet been performed. (C) 2013 Elsevier B.V. All rights reserved.
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