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A loose hybrid nanofiltration membrane fabricated via chelating-assisted in-situ growth of Co/Ni LDHs for dye wastewater treatment
Chemical Engineering Journal ( IF 15.1 ) Pub Date : 2018-07-12 , DOI: 10.1016/j.cej.2018.07.081
Shuang Zhao , Hongtai Zhu , Zhan Wang , Peng Song , Min Ban , Xufeng Song

A nano-filtration membrane with a loose LDHs/polymer hybrid layer which aimed at the desalination of textile wastewater was fabricated by chelating-assisted in-situ growth of layered double hydroxides (LDHs) on the organic substrate. The positively charged polyethyleneimine (PEI) with excellent chelating ability to metal ions was initially deposited on the hydrolyzed polyacrylonitrile (PAN) membrane surface by electrostatic interaction. Then, Co2+ ions were immobilized on the modified membrane though chelating reaction to form a Co2+/PEI complex layer, which provided a Co2+ source for the in-situ growth of Co/Ni LDHs at a lower temperature. Besides, the LDHs/PEI hybrid membrane prepared at optimized condition achieved a sufficient permeability (198.6 L/(m2·h·MPa)), high rejection for dyes (methyl blue 97.9% and acid fuchsin 97.5%) and low salt rejection (less than 3%). Meanwhile, this membrane possessed good hydrophilicity, satisfactory antifouling performance (flux recovery ratio was 89.5% for humic acid (HA)) and remarkable long-term stability. The loose LDHs/polymer hybrid layer was conducive to the transport of ions and water molecules, since the ridge-and-valley surface structure enhanced the steric hindrance effect and consequently increased the rejection of macromolecules. Therefore, this surface modification strategy can be applied to construct a ridge-and-valley porous structure on substrate for desalination of textile wastewater.



中文翻译:

通过螯合辅助原位生长Co / Ni LDHs制备的用于处理染料废水的松散杂化纳滤膜

通过在有机基质上螯合辅助原位生长层状双氢氧化物(LDHs),制得了具有疏松LDHs /聚合物杂化层的纳米过滤膜,该膜可用于纺织废水的脱盐。首先,通过静电相互作用,将具有优异的金属离子螯合能力的带正电的聚乙烯亚胺(PEI)沉积在水解的聚丙烯腈(PAN)膜表面上。然后,通过螯合反应将Co 2+离子固定在改性膜上,形成Co 2+ / PEI复合物层,为在较低温度下原位生长Co / Ni LDHs提供了Co 2+源。此外,在优化条件下制备的LDHs / PEI杂化膜具有足够的渗透性(198.6 L /(m2 ·h·MPa)),对染料的高排阻(甲基蓝97.9%和酸性品红97.5%)和低的排盐率(小于3%)。同时,该膜具有良好的亲水性,令人满意的防污性能(腐殖酸(HA)的通量回收率为89.5%)和出色的长期稳定性。松散的LDH /聚合物杂化层有利于离子和水分子的运输,因为脊和谷的表面结构增强了位阻效应,因此增加了大分子的截留率。因此,该表面改性策略可用于在基质上构造脊和谷的多孔结构,以使纺织废水脱盐。

更新日期:2018-07-12
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