摘要：

以氯球为基体，加入2-氨基-5-氰基吡啶反应得到树脂APN，然后在碱性条件下APN与盐酸羟胺发生胺肟化反应，制备得到偕胺肟吡啶螯合树脂（APO）。探究了不同酸度、不同盐度条件下制备的APO树脂对溶液中Cu（Ⅱ）的吸附性能。实验结果表明，当溶液pH为5和2时，Langmuir模型模拟得到的最大吸附量分别为1.21、0.33 mmol/g。随着酸度的升高，吸附量略有降低；随着盐度的增加，吸附量会逐渐增大。APO树脂主要是通过吡啶N原子和肟基中的O原子对Cu（Ⅱ）进行螯合去除，其具有较好的抗盐和抗酸特性。

关键词: 螯合树脂, 吸附, 重金属

Abstract:

Pyridine-functionalized beads APN were obtained by taking chloromethylated crosslinking polystyrene microspheres and 2-amino-5-cyanopyridine as raw materials. Then through an amidoxime reaction with hydroxylamine hydrochloride under alkaline conditions, amidoxime pyridine chelating beads (APO) was prepared. The adsorption properties of APO towards Cu(Ⅱ) were investigated in various acidic and salty concentration. Experimental results showed that at pH=5 and 2, the maximum adsorption capacities simulated by Langmuir model were 1.21 mmol/g and 0.33 mmol/g, respectively. With increase the concentration of H+, the adsorption amount decreased, however, the adsorption amount gave an elevation as the salty concentration increased. The removal of Cu(Ⅱ) was mainly accomplished through the chelation between N atoms(pyridine groups), O atoms(oxime groups) and Cu(Ⅱ), showing salient salt-tolerance and acid-tolerance properties.

Key words: chelating beads, adsorption, heavy metal

中图分类号: 

• TQ316.6

• X703