Date of Publication:2017-01-01

Journal:化工进展

Volume:36

Issue:12

Page Number:4658-4663

ISSN:1000-6613

Abstract:Membrane adsorption as a novel technology of removing heavy metal ions has been widely reported. However,the reported affinity membranes were mostly removing heavy metal ions by static adsorption. There are two deficiencies of static adsorption. The adsorption period is very long and the functional materials on the membranes are easily dissolved and detached in aqueous solution. Herein,a typical PEI-grafted porous membranes were prepared by poly-(3,4-dihydroxyphenylalanine)(PDOPA) deposition followed by polyethyleneimine(PEI)grafting and then cross-linking on polycaprolactam (PA-6) substrates. The PEI-grafted porous membranes with high specific surface area,high permeability and high chemical stability behaved excellently with trace Co2+ dynamic adsorption from wastewater. In details,the modified membranes successfully removed Co2+ under high water flux[850L/(m2·h),ΔP = 0.02MPa],and wide pH range(pH≥6). Besides,the modified membranes possess remarkable anti-ion interference and renewability with the renewable degree about 95% even after ten cycles. Thus,the PEI-grafted membranes are very promising for dynamically removing trace HMIs from wastewater.

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