| 光谱学与光谱分析 |
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| Application of FTIR Technique in Microwave-Hydrothermal Synthesis of Saponite |
| YAO Ming1, 2, LIU Zi-yang2, WANG Kai-xiong1, ZHU Miao-qin2，SUN Hong-jie2 |
1. College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310029, China
2. Department of Chemistry, Zhejiang University, Hangzhou 310027, China |
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Abstract FTIR was employed in the structure analysis of the saponites with an ideal chemical formula[Si6.5Al1.5]Ⅳ[Mg6]ⅥO20(OH)4 in the starting gel synthesized by microwave-hydrothermally under different pressures (1×105, 5×105, 1.5×106, 2.5 ×106 and 3.5×106 Pa). It was found that low frequency absorption region in infrared spectrum was sensitive to the crystallization of the product and the amorphous materials produced in synthesis of saponite under the radiation of microwave. The absorptions belong to amorphous materials were decreased with increasing pressure. Saponite synthesized at 3.5×106 Pa showed no amorphous absorptions (1 240, 590-602 cm-1), indicating the purity and quality of the synthetic mineral. It was worthy to note that Si(Al)—O stretching vibration infrared absorption could be regarded as an index in assessing the quality of synthetic 2∶1 trioctahedral smectite sample with the same chemical compositions. With the increasing pressure, this strong vibration shifted to low frequency (1 022, 1 020, 1 016, 1 016, 1005 cm-1) in the medium frequency of the whole infrared spectrum. Since the sensitivity, easiness and simplicity, this infrared index would be meaningful in practical saponite-related minerals analysis. In addition, powder X-ray diffraction and scanning electronic microscopy were employed in charactering the saponite synthesized by microwave-hydrothermal method in this work.
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Received: 2003-12-16
Accepted: 2004-03-28
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Corresponding Authors:
YAO Ming
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| Cite this article: |
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YAO Ming,LIU Zi-yang,WANG Kai-xiong, et al. Application of FTIR Technique in Microwave-Hydrothermal Synthesis of Saponite [J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(06): 870-873.
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| URL: |
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https://www.gpxygpfx.com/EN/Y2005/V25/I06/870 |
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