氧化还原功能纤维的研究──Ⅶ．含正丙胺基吸附剂的制备及其对Au^（3＋）的吸附性能

STUDY ON FUNCTIONAL REDOX FIBER Ⅶ.PREPARATION OF ADSORBENTS CONTAINING n-PROPYLAMINE AND THEIR ADSORPTION PROPERTIES TOWARDS Au￣(3+)

以氯甲基化纤维、聚乙烯醇（ＰＶＡ）接枝甲基丙烯酸缩水甘油酯（ＧＭＡ）_一缩二乙二醇丙烯酸双酯（ＤＧＡ）纤维：氯球三种反应性基体，合成了含氮量分别为２．３４，２．９４，１．６１ｍｍｏｌ／ｇ的含正丙胺基吸附剂。结果表明：该类吸附剂在高酸度（ｐＨ＜１．５）及低酸度（ｐＨ＞３．５）对Ａｕ^（３＋）都有较高的吸附量，而在ｐＨ１．５～３．０的吸附量较小甚至为零；且该类吸附剂在低酸度（ｐＨ＞２．５）对Ａｕ^（３＋）有还原作用，随溶液离子强度升高，吸附剂对Ａｕ^（３＋）的吸附量下降。吸附动力学实验结果表明：含正丙胺基吸附剂在ｐＨ４．０对Ａｕ^（３＋）的吸附速度很慢，７２ｈ后仍未达到饱和吸附。在扫描电子显微镜下观察到吸附态金聚集成粒状。

Three kinds of adsorbents containing n-propylamine have been synthesized by amination of different reactive polymeric matrices, chloromethylated fiber, PVA fiber grafting glycidylmethacrylate- diglycolacrylic ester and chloromethylated resin, with n-propylamine in dioxane. Their N content is 2.34, 2.94, 1.61 mmol/g. The results of static adsorption experiments showed that adsorption amount of the adsorbents towards Au(3+) was great in high acidicity(pH<1.5)or in low one(pH>3.5),but small,even zero between pH1. 5 and pH3.0, and decreases with the increase of solution ionic strength; The adsorbents can reduce Au(3+) into Au0 in low acidicty(pH>2.5). The data of adsorption kinetics experiments showed that adsorption rate of the adsorbents towards Au￣(3+) was very slow at pH4.0, and it took more than 72h to reach their saturate adsorption amount. Grains of gold on the adsorbents were observed under scanning electron microscope.