红外光谱研究螯合树脂对金属离子的选择性（Ⅱ）氨基膦酸型树脂对稀土元素的选择吸附

IR-Spectroscopic Study on Selectivity of Chelating Resins for Metal Ions (Ⅱ) Selective Adsorption of Aminophosphonic Resins for Rare Earth Elements

本文通过分析氨基膦酸树脂ＳＬ—４１１，ＳＬ—４６７和ＮＰ—５００吸附稀土离子Ｌａ（３＋），Ｓｍ（３＋）和Ｈｏ（３＋）所形成稀土树脂盐的红外光谱中Ｃ—Ｎ—Ｃ谱峰的位移值，获得了ＳＬ一４１１，ＳＬ－４６７和ＮＰ—５００树脂对Ｌａ（３＋），Ｓｍ（３＋），Ｈｏ（３＋）的选择性次序为Ｓｍ（３＋）＞Ｈｏ（３＋）＞Ｌａ（３＋）。观察到Ｃ—Ｎ—Ｃ谱峰的位移值随负载量的增加而增大。有可能通过红外光谱法来测定氨基膦酸树脂对金属离子的选择性和吸附量。

The selectivity order of aminophosphonic resins SL - 411, SL-467 and NP-500 for rare earth ions La3+, Sin3+ and Ho3+ is obtained according to the displacement value of the peak C -N - C of rare earth resin-salts formed by the resins adsorbing La3+, Sm3+ or Ho3+ respectively relate to that of the Na-resin in the IR-spectra, which is Sm3+>Ho3+>La3+.And based on the IR-spectra of the resins loaded with Sm3+ ions it is observed that the more loaded capacity of the resin, the more displacement of the peak C-N -C relate to that of the Na-resin is. Therefore, IR-spectrum method might be applied for measuring the selectivity and adsorbing capacity of aminophosphonic resins for metal ions.