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地质论评  2005 

富镁和贫镁坡缕石及其酸浸蚀产物的红外吸收光谱研究

Keywords: 坡缕石酸浸蚀光谱研究产物红外吸收光谱镁X射线衍射谱吸收峰骨架振动结构改变盐酸浓度八面体SiO高频区峰形不对称吸收带峰位移吸附水结晶水强度偏移波数

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Abstract:

本文对两个富镁和贫镁坡缕石的红外吸收光谱高频区的拟合结果表明,富镁坡缕石(p0)和贫镁坡缕石(g0)的八面体离子的配置有区别,前者除出现Mg3OH振动外,MgM2口OH振动的比例比AlM2口OH振动的大,后者则反之。经酸短时间浸蚀的和未经浸蚀的坡缕石红外吸收光谱相比,除部分吸收峰(如3560cm^-1)的峰形发生明显变化外,其余各吸收峰的峰形相似、强度稍有变化,且Siu-O-SiD的不对称振动吸收峰向低波数方向偏移、对称吸收峰向高波数方向偏移;坡缕石中790cm^-1左右的吸收峰的归属是不明确的,据实验确认它是由Siu-O-SiD的对称吸收所致;由985cm^-1、1030cm^-1、1080cm^-1和1200cm^-1左右4个吸收峰组成Si-O骨架振动吸收带的峰形、强度和峰位移反映了酸浸蚀过程中坡缕石的结构改变。两个坡缕石经360h盐酸浓度为1mol/L和3mol/L浸蚀后,所得产物的粉末X射线衍射谱虽仍具有坡缕石的衍射线,但它们的红外吸收光谱却只有与表面OH振动、物理吸附水相关的OH振动和几个SiO振动吸收峰,而无代表八面体振动、硅氧骨干中的大部分SiO振动和晶格中的结晶水的振动,说明酸对坡缕石浸蚀的最后产物是以硅氧为主。

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