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Synthesis and characterization of g-C3N4 nanosheet modified polyamide nanofiltration membranes with good permeation and antifouling properties

机译：G-C3N4纳米片改性聚酰胺纳米过滤膜具有良好渗透性和防污性能的合成与表征

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摘要

The incorporation of nano materials into a polyamide (PA) active layer of nanofiltration membranes has become a main choice for the improvement of membrane performance. In this paper, g-C3N4 nanosheets (CNs) were introduced to aqueous solution for the modification of a PA active layer via an interfacial polymerization reaction between piperazine and trimesoyl chloride monomers. FT-IR and XRD analysis confirmed the presence of CNs on the surface of nanofiltration membranes. SEM images indicated the formation of an active layer on the top of the polyethersulfone (PES) substrate and a good dispersion of CNs. AFM images proved that the surface roughness was increased after the incorporation of CNs. The contact angle measurement demonstrated that the surface hydrophilicity of the CN modified PA (PA/CNs) membrane was promoted. Thermal stability and surface charge of the membranes were investigated by TGA and zeta potential analysis, respectively. Compared with a pristine PA membrane, for the membrane containing CNs (0.0025 wt% in aqueous solution) a distinct increase of water flux from 20.9 L m(-2) h(-1) to 37.6 L m(-2) h(-1) at 2 bar was observed, while salt rejection of Na2SO4 was maintained above 84.0%. What's more, the anti-fouling properties of the PA/CNs membrane were investigated by using bovine serum albumin and humic acid aqueous solutions, and the results confirmed that the incorporation of CNs into PA membranes could improve antifouling performance.
机译：将纳米材料掺入聚酰胺（PA）的纳米滤膜的活性层已成为改善膜性能的主要选择。在本文中，将G-C3N4纳米蛋白酶（CNS）引入水溶液中，通过哌嗪和三咪酰氯单体之间的界面聚合反应改变PA活性层。 FT-IR和XRD分析证实了在纳米滤膜表面上的CNS存在。 SEM图像指示在聚醚砜（PES）衬底顶部的形成和CNS的良好分散。 AFM图像证明了CNS掺入后的表面粗糙度增加。接触角测量表明，促进了CN改性PA（PA / CNS）膜的表面亲水性。通过TGA和Zeta电位分析研究了膜的热稳定性和表面电荷。与原始PA膜相比，对于含CNS的膜（0.0025wt％在水溶液中）的水通量不同的水通量增加到20.9μm（-2）H（-1）至37.6μm（-2）H（ - 1）观察到2巴，而Na 2 SO 4的盐排斥保持在84.0％以上。更重要的是，通过使用牛血清白蛋白和腐殖酸水溶液研究了PA / CNS膜的抗结垢性能，结果证实CNS掺入PA膜可以改善防污性能。

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  • 来源
    《RSC Advances》 |2016年第113期|共10页
  • 作者

    Chen Jianxin; Li Zhiyuan; Wang Chongbin; Wu Hong; Liu Gang;

  • 作者单位

    Hebei Univ Technol Sch Marine Sci &

    Engn Tianjin 300130 Peoples R China;

    Hebei Univ Technol Sch Chem Engn Tianjin 300130 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300072 Peoples R China;

    Tianjin Univ Sch Chem Engn &

    Technol Tianjin 300072 Peoples R China;

    Hebei Univ Technol Sch Chem Engn Tianjin 300130 Peoples R China;

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  • 正文语种 eng
  • 中图分类 化学;
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