Size effects of exchange cation on the pore structure and surface fractality of montmorillonite

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题名:	Size effects of exchange cation on the pore structure and surface fractality of montmorillonite
作者:	Lee,JF;Lee,CK;Juang,LC
贡献者:	環境工程研究所
关键词:	POROUS SOLIDS;NONINTEGER DIMENSIONS;ORGANIC CONTAMINANTS;SORPTION;ADSORPTION;CHEMISTRY
日期:	1999
上传时间:	2010-06-29 18:21:12 (UTC+8)
出版者:	中央大學
摘要:	Ca-montmorillonites were exchanged with both metal cations (manganese and copper) and organic cations (tetramethylammonium (TMA) and hexadecyltrimethylammonium (HDTMA)) to study the cation size effects on the pore structure and surface roughness of montmorillonite based on the classical and fractal analysis of their nitrogen adsorption isotherms. The surface fractal dimension D was calculated from their nitrogen isotherms with the aid of the recently proposed Neimark equation. The decrease of BET surface area of montmorillonite induced by the larger size of exchange cation was interpreted with both the coverture of some surface roughness (surface screening effect) and the inhibition of nitrogen molecule into some pores (pore blocking effect), The pore blocking effect was examined with the changes of mean pore size. Meanwhile, the D value was used to examine whether or not the surface screening effect existed. It was concluded that the combination of classical and fractal analyses of nitrogen isotherms may facilitate our understanding of the evolution of pore and surface structures of clay exchanged with different cations. (C) 1999 Academic Press.
關聯:	JOURNAL OF COLLOID AND INTERFACE SCIENCE
显示于类别:	[環境工程研究所 ] 期刊論文

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