Thermodynamics of adsorption of uranyl ions onto amidoximated poly(acrylonitrile)/poly(N-vinyl 2-pyrrolidone) interpenetrating polymer networks

被引：12
|
作者：
Pekel, N [1 ]
Sahiner, N [1 ]
Güven, O [1 ]
机构：
[1] Hacettepe Univ, Dept Chem, TR-06532 Ankara, Turkey
来源：
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS | 2004年 / 42卷 / 06期
关键词：
IPN; adsorption; thermodynamics; hydrogels; uranyl ion; amidoxime group;
D O I：
10.1002/polb.10738
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The interaction of uranyl ions (UO22+) with interpenetrating polymer networks (IPNs) based on amidoximated poly(acrylonitrile)/poly(N-vinyI 2-pyrrolidone) was examined. The adsorption capacity of IPN hydrogels as well as the adsorption kinetics and the effect of temperature on UO22+ ion adsorption were investigated. Thermodynamic quantities and kinetic parameters were calculated with adsorption isotherm data. The initial adsorption-rate values for each temperature were calculated, and the corresponding rate constants decreased with increasing temperature. The adsorption enthalpy, entropy, and free energy of the UO22+ ion with., amidoximated IPN hydrogels were calculated from basic thermodynamic relations. It was assessed that adsorption occurred by strong electrostatic interactions with an adsorption enthalpy of -31.5 kJ/mol. (C) 2004 Wiley Periodicals, Inc.
引用
收藏
页码：986 / 993
页数：8
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