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Preparation and characterization of polyzwitterionic hydrogel coated polyamide‐based mixed matrix membrane for heavy metal ions removal
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-07-06 , DOI: 10.1002/app.49595 Majid Pakizeh 1 , Patrick May 2 , Marcel Matthias 2 , Mathias Ulbricht 2
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2020-07-06 , DOI: 10.1002/app.49595 Majid Pakizeh 1 , Patrick May 2 , Marcel Matthias 2 , Mathias Ulbricht 2
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A novel polyzwitterionic hydrogel coated mixed matrix membrane (MMM) was successfully prepared, characterized and used for Cu2+, Mn2+, and Pb2+ heavy metal ions removal from water. Hydrophilic and porous covalent organic framework (COF) nanoparticles (NP) as filler were synthesized from melamine and terephthalaldehyde, and then incorporated into polyamide (PA) thin film composite (TFC) membrane. The hydrogel coating was applied by using a tailored cross‐linkable polymer system in combination with concentration polarization enabled cross‐linking. The effects of COF NP loading into PA layer and polyzwitterionic hydrogel coating on the membrane morphology and separation performance were studied using different analyses. The MMM prepared with a COF NP loading of 0.02 wt/wt% in the hexane dispersion used for NP deposition during PA layer formation (leading to 0.42 g/m2) exhibited an increased pure water permeability of around 200% compared with the neat PA TFC membrane while the Mn2+ ion rejection maintained above 98%. Scanning electron microscopy surface images and zeta potential profiles showed that the hydrogel was successfully deposited on the membrane surface. Furthermore, the hydrogel coating could decrease net surface charge of membranes but did not significantly influence the heavy metal ions rejections under nanofiltration conditions. The results of filtration experiment with protein solution indicated that the hydrogel coated membranes exhibited superior antifouling property, as shown by higher flux recovery ratio after washing with water, compared with neat PA TFC membrane and not coated MMM, respectively.
中文翻译：
聚两性离子水凝胶包覆的聚酰胺基混合基质膜的制备和表征以去除重金属离子
成功制备了新型的两性离子水凝胶包被的混合基质膜（MMM），表征并用于Cu 2 +，Mn 2+和Pb 2+从水中去除重金属离子。从三聚氰胺和对苯二甲醛合成了亲水性和多孔性共价有机骨架（COF）纳米粒子（NP），然后掺入聚酰胺（PA）薄膜复合材料（TFC）膜中。水凝胶涂料是通过使用量身定制的可交联聚合物体系与浓差极化可交联相结合而施加的。使用不同的分析方法研究了COF NP装入PA层和聚两性离子水凝胶涂层中对膜形态和分离性能的影响。在PA层形成期间用于NP沉积的己烷分散液中，COF NP负载量为0.02 wt / wt％的MMM制备（导致0.42 g / m 2）与纯PA TFC膜相比，纯水渗透率提高了约200％，而Mn 2+离子截留率保持在98％以上。扫描电子显微镜表面图像和ζ电势图表明水凝胶成功沉积在膜表面上。此外，水凝胶涂层可以减少膜的净表面电荷，但在纳滤条件下不会显着影响重金属离子的排斥。蛋白质溶液过滤实验的结果表明，与纯PA TFC膜和未包覆的MMM相比，水凝胶包覆的膜表现出优异的防污性能，如水洗后的通量回收率更高。
更新日期：2020-07-06
中文翻译：
聚两性离子水凝胶包覆的聚酰胺基混合基质膜的制备和表征以去除重金属离子
成功制备了新型的两性离子水凝胶包被的混合基质膜（MMM），表征并用于Cu 2 +，Mn 2+和Pb 2+从水中去除重金属离子。从三聚氰胺和对苯二甲醛合成了亲水性和多孔性共价有机骨架（COF）纳米粒子（NP），然后掺入聚酰胺（PA）薄膜复合材料（TFC）膜中。水凝胶涂料是通过使用量身定制的可交联聚合物体系与浓差极化可交联相结合而施加的。使用不同的分析方法研究了COF NP装入PA层和聚两性离子水凝胶涂层中对膜形态和分离性能的影响。在PA层形成期间用于NP沉积的己烷分散液中，COF NP负载量为0.02 wt / wt％的MMM制备（导致0.42 g / m 2）与纯PA TFC膜相比，纯水渗透率提高了约200％，而Mn 2+离子截留率保持在98％以上。扫描电子显微镜表面图像和ζ电势图表明水凝胶成功沉积在膜表面上。此外，水凝胶涂层可以减少膜的净表面电荷，但在纳滤条件下不会显着影响重金属离子的排斥。蛋白质溶液过滤实验的结果表明，与纯PA TFC膜和未包覆的MMM相比，水凝胶包覆的膜表现出优异的防污性能，如水洗后的通量回收率更高。
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