Abstract:There are four different types of molecules of hydroxyl groups of the natural attapulgite. The band at 3 614 cm-1 was attributed to the stretching modes of hydroxyls coordinated with the magnesium. The band at 3 415 cm-1 is associated with the hydroxyl streuching vibrations of absorbed water. The bands at 3 581 and 3 552 cm-1 were attributed to the symmetric and antisymmetric stretching modes of molecular water coordinated with the magnesium at the edges of the channels. The band at 1 653 cm-1 is associated with the hydroxyl stretching vibrations of zeolitic water. The structures of the natural palygorskite and its products dried at different temperatures for 30 min were analysed by Fourier transform infrared spectroscopy(FTIR) and X-ray diffraction(XRD). The absorbed, zeolitic and co-ordinated water decreased during the drying process at the same time. The absorbed water was completely-dehydrated firstly, then the zeolitic water, and lastly the co-ordinated water. And the hydroxyl groups remained until about 600 ℃. When the co-ordinated water was dehydrated completely at 450 ℃, the crystalloid was destroyed. The mechanism of the palygorskite structure change was also discussed in detail.
黄健花,刘元法,金青哲,王兴国* . 加热影响凹凸棒土结构的光谱分析[J]. 光谱学与光谱分析, 2007, 27(02): 408-410.
HUANG Jian-hua, LIU Yuan-fa, JIN Qing-zhe, WANG Xing-guo*. Spectra Study on the Influence of Drying Process on Palygorskite Structure. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(02): 408-410.
[1] WANG Yi-zhong, DONG Hua, SHE Ding-sheng(王一中, 董 华, 佘鼎声). China Synthetic Resin and Plastics(合成树脂及塑料), 1997, 14(2): 16. [2] Uárez M S Barrios, Flores L V González, Vicente M A Rodríguez, et al. Applied Clay Science, 1995, 10: 247. [3] Frost R L, Ding Z. Thermochimica Acta, 2003, 397: 119. [4] Ray L Frost, Gerg A Cash, Theo J Kloprogge. Vibrational Spectroscopy, 1998, 16: 173. [5] NIU Guang-liang, WANG Tong, WENG Shi-fu, et al(牛光良, 王 同, 翁诗甫,等). Chinese Journal of Prosthodontics(口腔颌面修复学杂志), 2002, 3(4): 208. [6] Ray L Frost, Oliver B Locos, Huada Ruan, et al. Vibrational Spectroscopy, 2001, 27: 1. [7] Madejova J. Vibrational Spectroscopy, 2003, 31: 1. [8] HAO Qing-li, YANG Xu-jie, WANG Ying, et al(郝青丽, 杨绪杰, 王 瑛, 等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2000, 20(3): 302. [9] Ara’ujo D M Melo, Ruiz J A C, Melo M A F, et al. Microporous and Mesoporous Material, 2000, 38: 345. [10] ZHENG Yu-ying, WANG Can-yao, FU Ming-lian(郑玉樱, 王灿耀, 傅明连). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2005, 25(11): 1813. [11] Ara’ujo D M Melo, Ruiz J A C, Melo M A F, et al. Journal of Alloys and Compounds, 2002, 344: 352.