双醛淀粉尿素螯合树脂对Cu(Ⅱ)吸附性能的研究

Adsorption properties of dialdehyde starch based urea chelating resin to Cu(Ⅱ)

合成了双醛淀粉尿素螯合树脂（DASU）,并对其做了红外（FT-IR）和扫描电镜（SEM）分析,研究了不同条件下不同取代度的产品对Cu（Ⅱ）的吸附性能.结果表明：所有样品对Cu（Ⅱ）均有一定程度的吸附作用,在pH 5-6时吸附能力最强,较高的初始浓度有利于吸附,但高取代度的样品对Cu（Ⅱ）并不具有显著提高的吸附能力,吸附主要靠物理吸附和化学吸附.

Dialdehyde starch based urea chelating resin was first synthesized and characterized by FT-IR spectra and scanning electron microscope（SEM）analysis.Several samples with different substitutions were conducted to study their absorption capacity to Cu（Ⅱ）ions in different conditions.The results revealed that all samples showed adsorption capacity to Cu（Ⅱ）ions to a certain extent,and they had the muximum adsorption capacity if pH was controlled at 5.0-6.0.Moreover,higher initial Cu（Ⅱ）ion concentrations were favorable to absorption.However,the samples of higher degrees of substitution didn＇t hold significant adsorption capacity to Cu（Ⅱ）ions.The adsorption process mainly depended on physical and chemical adsorption.