Preparation of water-stabilized PEI@UIO-67-bpy composites and adsorption of Cr(Ⅵ)
UIO-67-bpy with good water stability was prepared by a solvothermal method,and polyethyleneimine(PEI),which contains a large number of amino functional groups,was introduced into UIO-67-bpy by a simple impregnation method to further enhance the stability and improve the adsorption performance and recycling ability for Cr(Ⅵ).The kinetics experiments showed that the adsorption reached the adsorption equilibrium at 90min and the removal rate was as high as 99％,and the adsorption of Cr(Ⅵ)by PEI@UIO-67-bpy was in accordance with the proposed two-stage kinetic model.The theoretical maximal adsorption capacity of Cr(Ⅵ)derived from the Langmuir isotherm model was 297.7mg/g.The cyclic regeneration experiments demonstrated that the removal efficiency of Cr(Ⅵ)was maintained at more than 95％after five cycles.The removal of Cr(Ⅵ)by PEI@UIO-67-bpy involves electrostatic interaction and reduction of Cr(Ⅵ).In conclusion,PEI@UIO-67-bpy is an excellent adsorbent with simple preparation,good stability and adsorption properties,and can be recycled.
万方数据
维普
