Adsorption of trivalent cations on silica

被引:51
作者
Kosmulski, M [1 ]
机构
[1] Forschungszentrum Karlsruhe GmbH, Inst Nukl Entsorgungstech, D-76021 Karlsruhe, Germany
关键词
gadolinium; yttrium; silicon(IV) oxide; specific adsorption; triple-layer model; surface complexation; ternary surface complex;
D O I
10.1006/jcis.1997.5155
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Gadolinium and yttrium show very similar adsorption behaviors on silica. For the both trivalent cations, the adsorption isotherms are insensitive to the ionic strength. The slope of the log-log adsorption isotherms at a constant pH is considerably lower than 1, except for the range of very low equilibrium concentrations. This behavior can be explained without invoking surface heterogeneity considering the presence of a small concentration of anions, An(2-), as an impurity. A hypothetical ternary complex SiOGdAn is very strong and this leads to enhanced uptake at low initial concentrations. When [Gd3+] much greater than [An(2-)], only a small fraction of Gd can be adsorbed as SiOGdAn and the percentage of uptake is low. (C) 1997 Academic Press.
引用
收藏
页码:395 / 403
页数:9
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