Ni2+印迹磁性交联壳聚糖微球的选择性吸附性能OA北大核心CSTPCD

Ni2+imprinted magnetically cross-linked chitosan microspheres were prepared with Ni2+as the template ion,chitosan as the main raw material,Fe3O4 as the magnetic core,and epichlorohydrin as the cross-linking agent.The characterization results show that the microspheres exhibit a three-dimensional structure with many wrinkles on the surface and a decrease in crystallinity,which is beneficial to adsorb Ni2+.According to the selective adsorption results of binary metal ion systems,the microspheres have good selective adsorption performance for Ni2+in Ni2+-Zn2+,Ni2+-Cu2+,and Ni2+-Cr2+binary systems with equal and different concentrations.The selective adsorption coefficient rises as the concentration of Ni2+increases.The selective adsorption results of the Ni2+-Zn2+-Cu2+-Cr2+quaternary metal ion system indicate that the equilibrium adsorption capacity of microspheres for Ni2+is significantly higher than the other three metal ions.The order of equilibrium adsorption capacity is Ni2+>Cu2+>Zn2+>Cr2+.The selective adsorption coefficients of Ni2+relative to Cu2+,Zn2+,and Cr2+are 81.545,156.529,and 544.720,respectively.