核-壳型巯基胺螯合树脂的制备及其吸附性能

Synthesis and Adsorption Studies of Silica-Carried Core-Shell Polyethyleneimine Resins with Pendent Mercapto Group

以石英砂为核 ,合成了一类核 -壳型巯基胺螯合树脂 ,研究了它们对 Au( ) ,Pd( ) ,Ag( ) ,Hg( ) ,Cu( ) ,Pb( )和 Mg( )的吸附性能 .实验结果表明 ,该类螯合树脂对 Au( ) ,Pd( ) ,Ag( )等贵金属离子和 Hg( )有良好的吸附性能 .在 Cu( ) ,Zn( ) ,Mg( )或 Cd( )离子共存情况下 ,该树脂能选择性吸附 Au( )和 Ag( ) ,吸附容量分别可达 5 .42 ,5 .2 6 m mol/g.用 4%硫脲的 0 .1mol/L盐酸溶液作解吸剂 ,Au( )和 Pd( )的解吸率分别可达 95 %和 98% .

Four silica-carried core-shell polyethyleneimine resins with pendent mercapto group were synthesized by the condensation polymerization of polyethyleneimine with chloromethylthiirane, and their adsorption properties for Au(Ⅲ), Pd(Ⅱ), Ag(Ⅰ), Hg(Ⅱ), Cu(Ⅱ), Pb(Ⅱ) and Mg(Ⅱ) were also studied. The experimental results show that the resins have excellent adsorptive ability for studied noble metal ions and Hg(Ⅱ). In the coexist of Cu(Ⅱ), Zn(Ⅱ), Cd(Ⅱ) or Mg(Ⅱ), the resins could selectively adsorb Au(Ⅲ) or Ag(Ⅰ). The adsorptive selectivity to noble metal ions and Hg(Ⅱ) was improved when adsorptive systems contained EDTA. Furthermore, desorption ratios of the resins for Au(Ⅲ) and Pd(Ⅱ) reached 95% and 98%, respectively.