偕胺肟基纤维对金离子选择吸附性能研究

Research on the gold adsorption selectivity of amidoxime fiber

在试验基础上测试了偕胺肟基纤维在双组分和多组分体系中对Au3+的选择吸附效果,即偕胺肟基纤维表现出了极佳的选择吸附性能。从离子交换和螯合吸附的角度,根据偕胺肟基纤维本身的交联结构和最大氰基转化特点以及金离子本身的结构特点对其高选择吸附性能进行了解析。以红外光谱和X射线衍射等表征方法对吸附反应机理进行了探讨,发现偕胺肟基纤维对Au3+吸附为先螯合吸附然后氧化还原的过程。以反应机理结合偕胺肟基纤维的吸附动力学性能推测这种吸附反应特殊性也决定了偕胺肟基纤维的高吸附性能。

Based On the past work, the adsorption selectivity of amidoxmie fiber was investigated in bi-and multi-component system, the fiber exhibited excellent selective adsorption performance towards Au^3＋ ion. From the point of ion exchange and chelating, the high adsorption selectivity was investigated by the peculary structure of amidoxime fiber （combined with crosslinking structure and the maximal conversion of cyano） and Au ion. The gold adsorption mechanism was studied by IR spectra and Xray diffraction et al. The adsorption process is divided into two stages： firstly, the Au^3＋ ions chelat with amidoxime groups, and then redox reaction occurres. Combining the adsorption mechanism with the adsorption kinetics, it can be concluded that the high adsorption selectivity was determined by the adsorption peculiarity .