Dilatometric study of the adsorption of heavy-metal cations on goethite

被引：21

作者：

Kosmulski, M ^{[1
]}

Maczka, E ^{[1
]}

机构：

[1] Tech Univ Lublin, Dept Electrochem, PL-20618 Lublin, Poland

来源：

LANGMUIR | 2004年 / 20卷 / 06期

关键词：

D O I：

10.1021/la0356957

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The specific volumes of adsorption of Cd, Co, Cu, Ni, Pb, and Zn on goethite determined by means of the dilatometric method are 21, 32, 32, 31, 31, and 42 cm(3)/mol, respectively, and are independent of pH. The effect of NaCl (up to 0.5 mol dm(-3)) on the specific volume of adsorption is rather insignificant. The specific volume of precipitation of corresponding hydroxides (determined experimentally and calculated) is about 60 cm(3)/mol. Apparently, the adsorbed heavy-metal cations lose half of their hydration water. The adsorption constant decreases as the pressure increases, and the effect becomes significant at pressures of > 10(7) Pa, i.e., more than 1 km of water column.

引用

页码：2320 / 2323

页数：4

共 56 条

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