Complexation behavior of poly(acrylic acid) and lanthanide ions

被引：54

作者：

Qi, Xiaocun ^{[1
]}

Wang, Zhiliang ^{[1
]}

Ma, Songmei ^{[1
]}

Wu, Lianjia ^{[1
]}

Yang, Shuguang ^{[1
]}

Xu, Jian ^{[2
]}

机构：

[1] Donghua Univ, Coll Mat Sci & Engn, State Key Lab Modificat Chem Fibers & Polymer Mat, Shanghai 201620, Peoples R China

[2] Chinese Acad Sci, Inst Chem, Lab Polymer Phys & Chem, Beijing 100190, Peoples R China

来源：

POLYMER | 2014年 / 55卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Poly(acrylic acid); Lanthanides; Polymer-metal complex; METAL-COMPLEXES; HUMIC-ACID; POLYMER; LUMINESCENCE; EQUILIBRIA; BINDING; EU3+; GELS; PH;

D O I：

10.1016/j.polymer.2014.01.051

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 complexation behavior of PAA and lanthanide (Ln) ions was schematically investigated. As pH increased, the complexation between FAA and Ln ions will greatly strengthen because COO- groups exhibit much stronger interaction with Ln ions than COOH. When the pH values are higher than 2.5, where the ionization of PAA is about 2.0%, the PAA Ln complex would precipitate out from the solution. The precipitation is a direct indicator for the complexation between FAA and Ln ions. Besides pH values, the complex precipitation is related with the concentration, the molar ratio, and the operation procedure. At the extremely low concentration, there is no polymer metal complex precipitation but fluorescence spectroscopy reveals that the complexation between FAA and Ln ions still exists when pH value is higher than 2.5. When the molar ratio of FAA and Ln ions exceeds the certain level, it would produce soluble polymer metal complex, even at the high concentration of Ln ions. (C) 2014 Elsevier Ltd. All rights reserved.

引用

页码：1183 / 1189

页数：7

共 47 条

[11] Ionization equilibria and conformational transitions in polyprotic molecules and polyelectrolytes [J].