碱性同离子蒙脱石中水的表征及动力学

M. Belhocine, A. Haouzi, G. Bassou, J. Bantignies, D. Maurin, F. Henn
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引用次数: 2

摘要

本文的目的是研究层间阳离子对碱金属交换蒙脱土吸附-解吸水机理的影响。这是通过热力学测量完成的,即水的吸附和解吸等温线。原料经过沉淀净化处理,然后进行阳离子交换。干燥状态下的IR和XRD分析证实,处理得到的同离子型粘土没有破坏其结构。由XRD得到的层间距离d001值直接取决于阳离子半径。在蒙脱土上记录的红外光谱显示,在室内气氛下,oh / sio峰的面积比ν与吸附水量对应的顺序为:K >Rb> Cs > Li > Na,与解吸焓的演化规律一致。吸附和解吸等温线表明,在一定的水相对压力下,补偿阳离子的性质显著改变了吸附/解吸量。因此,在P/P0 = 0.5时吸附的总水量顺序相同。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Characterization and dynamic of water in alkali homoionic montmorillonites
The objective of this work is to study the effect of interlayer cations on the mechanism of adsorption-desorption of water in the case of a montmorillonite exchanged by alkali metals. This is done through thermodynamic measurements, i.e. isotherms of adsorption and desorption of water. The raw material is subjected to purification treatment by using the sedimentation followed by cationic exchange. IR and XRD analysis of the dry state confirm that the treatment used for obtaining homoionic clays does not deteriorate their structure. The value of the interlayer distance d001obtained from XRD depends directly on the cation radius. IR spectra recorded on our montmorillonite reveals that the area ratio νOH/νSiO peaks which corresponds to the amount of adsorbed water under room atmosphere follows the sequence: K >Rb> Cs > Li > Na In accordance the evolution observed for the desorption enthalpies. The adsorption and desorption isotherms show that the nature of the compensating cation considerably changes the adsorbed / desorbed amount for a given water relative pressure. Thus, the total amount of water adsorbed at P/P0 = 0.5 follows the same sequence.
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