摘要
膜吸附是废水中重金属离子捕集的一种新兴方法,但是现有的吸附性亲和膜多是通过静态吸附捕集重金属离子,吸附周期比较长,并且膜上的功能性材料在水溶液中长时间浸泡容易溶解脱落。本研究通过引入聚左旋多巴胺(PDOPA)为过渡层,在尼龙-6(PA-6)基膜上接枝聚乙烯亚胺(PEI),并用戊二醛固化交联PEI,制备了一种化学结构稳定、比表面积高、渗透性能好、可动态吸附重金属离子的亲和膜。改性后的膜在模拟废水中展现出优异的Co^(2+)吸附性能,能够在高通量[850L/(m2·h),ΔP=0.02MPa]、较宽的pH范围内(p H≥6)有效去除废水中的微量Co^(2+),并且改性膜具有良好的抗离子干扰性能以及可再生性能,10次循环使用后膜的再生效率超过95%,在含金属废水处理领域具有很好的应用前景。
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 Co^2＋ dynamic adsorption from wastewater.In details,the modified membranes successfully removed Co^2＋ under high water flux[850 L/（m-2·h）,ΔP = 0.02 MPa],and wide p H range（p H≥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.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2017年第12期4658-4663,共6页
Chemical Industry and Engineering Progress
基金
国家自然科学基金(21606035
21676043
21606120)
长江学者项目(T2012049)
关键词
亲和膜
聚乙烯亚胺
吸附
钴
废水
再生
affinity membrane
polyethyleneimine
adsorption
cobalt
wastewater
regeneration
