含邻苯二酚基团N-炔丙基酰胺螺旋聚合物对金属离子的吸附研究

Adsorption behavior of helical poly (N-propargylamide)s containing catechol groups toward metal ions

设计合成了一类侧链上含有邻苯二酚基团的N-炔丙基酰胺螺旋聚合物,研究了其对水溶液中的Fe(Ⅲ),Ni(Ⅱ)和Cu(Ⅱ)3种金属离子的吸附行为。结果表明,两种金属离子共存时存在竞争吸附,三者的竞争吸附关系为Fe(Ⅲ)>Cu(Ⅱ)>Ni(Ⅱ);共聚物吸附Fe(Ⅲ)的动力学过程可用准一级动力学模型来描述;吸附后所形成的Fe(Ⅲ)络合物中,聚合物的二级结构随Fe(Ⅲ)的吸附量变化而变化,两者之间存在定性关系。

A class type of helical N-propargylamide copolymers with catechol groups in the side chains has been synthesized.The copolymers were used to adsorbing Fe（Ⅲ）,Cu（Ⅱ） and Ni（Ⅱ） from aqueous solution.It was found that the competitive adsorption capacity decreased in the order Fe（Ⅲ）Cu（Ⅱ）Ni（Ⅱ）.The adsorption kinetics process of the copolymers toward Fe（Ⅲ） followed the pseudo first-order kinetic model.Furthermore,the secondary structure of the copolymer in the Fe（Ⅲ） complex varied with the amount of Fe（Ⅲ） adsorbed by the copolymer,and a qualitative relationship between them was observed.