温敏性线型共聚物对金属离子的吸附

Absorptivity of temperature sensitivity linear copolymers to metal ions in dilute aqueous solution

利用合成的ＮＩＰＡＡｍＡＡｃ 温敏性线型共聚物研究了其对无机金属离子的吸附性能，以期应用于水污染的治理．结果表明其有明显的浓集效果，在ｐＨ＝ ４ 时，对Ｙ３＋ 、Ｅｒ３＋ 和ＵＯ２＋２ 的浓集率分别达到８４％ 、６５ ％ 和５６ ％ ，相应的浓集量分别为１１－２ ｍｇ·ｇ－ １ 、４－４５ ｍｇ·ｇ －１ 和１１－３ ｍｇ·ｇ－ １ ，并讨论了影响浓集的条件和吸附机理．

Absorptivity of linear copolymers to metal ions was studied in dilute aqueous solution.The conditions of concentration were given and the mechanism was discuses.The concentration effect of poly(NIPAAm\|co\|AAc) was higher than that of polyNIAAm,which was found not only for Er\+\{3+\} but for UO\+\{2+\}\-2 and Cr(VI).Because polyNIPAAm is nonionizing polymer which was not influenced by pH.On the contrary,ionization of poly(NIPAAm\|co\|AAc) took place at high pH.The hydrolysis of these metals was suggested in the pH range of 2 to 4.Concentration effect of copolymer for UO\+\{2+\}\-2 was found at pH 3.The concentration yield increased rapidly with a little increase in pH,because six\|element\|ring compound of COOH with UO\+\{2+\}\-2 was formed.The concentration effect was observed for Er\+\{3+\},UO\+\{2+\}\-2 and Cr(VI).