Nanofiltration Membrane with a Mussel-Inspired Interlayer for Improved Permeation Performance,Langmuir

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Nanofiltration Membrane with a Mussel-Inspired Interlayer for Improved Permeation Performance
Langmuir ( IF 3.7 ) Pub Date : 2017-02-17 00:00:00 , DOI: 10.1021/acs.langmuir.6b04465
Xi Yang ₁ , Yong Du ₁ , Xi Zhang ₁ , Ai He ₁ , Zhi-Kang Xu ₁

Affiliation

A mussel-inspired interlayer of polydopamine (PDA)/polyethylenimine (PEI) is codeposited on the ultrafiltration substrate to tune the interfacial polymerization of piperazine and trimesoyl chloride for the preparation of thin-film composite (TFC) nanofiltration membranes (NFMs). This hydrophilic interlayer results in an efficient adsorption of piperazine solution in the substrate pores. The solution height increases with the PDA/PEI codeposition time from 45 to 135 min due to the capillary effect of the substrate pores. The prepared TFC NFMs are characterized with thin and smooth polyamide selective layers by ATR/IR, XPS, FESEM, AFM, zeta potential, and water contact angle measurements. Their water permeation flux measured in a cross-flow process increases to two times as compared with those TFC NFMs without the mussel-inspired interlayer. These TFC NFMs also show a high rejection of 97% to Na₂SO₄ and an salt rejection order of Na₂SO₄ ≈ MgSO₄ > MgCl₂ > NaCl.

中文翻译：

具有贻贝启发性夹层的纳滤膜，可改善渗透性能

以贻贝为灵感的聚多巴胺（PDA）/聚乙烯亚胺（PEI）夹层共沉积在超滤基质上，以调节哌嗪和偏苯三酰氯的界面聚合，以制备薄膜复合材料（TFC）纳滤膜（NFM）。该亲水性夹层导致哌嗪溶液在底物孔中的有效吸附。由于底物孔隙的毛细作用，溶液高度随PDA / PEI共沉积时间从45分钟增加到135分钟。制备的TFC NFM通过ATR / IR，XPS，FESEM，AFM，ζ电位和水接触角测量，具有薄而光滑的聚酰胺选择性层。与没有贻贝启发的夹层的TFC NFM相比，在错流过程中测得的它们的透水通量增加了两倍。₂ SO ₄和Na的盐拒绝命令₂ SO ₄ ≈硫酸镁₄ >的MgCl ₂ > NaCl中。

更新日期：2017-02-17

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