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首页> 外文期刊>Environmental Science & Technology >Low-Pressure Nanofiltration Hollow Fiber Membranes for Effective Fractionation of Dyes and Inorganic Salts in Textile Wastewater
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Low-Pressure Nanofiltration Hollow Fiber Membranes for Effective Fractionation of Dyes and Inorganic Salts in Textile Wastewater

机译：低压纳滤中空纤维膜可有效分离纺织废水中的染料和无机盐

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摘要

In this work, novel loose nanofiltration (NF) hollow fiber membranes with ultrahigh water permeability and well-defined nanopore and surface charge characteristics were developed for effective fractionation of dyes and inorganic salts in textile wastewater treatment. The as-spun NF hollow fiber possesses a high pure water permeability (PWP) of 80 L·m~(–2)·h~(–1)·bar~(–1) with a small pore size of 1.0 nm in diameter and a MWCO of 1000 Da. The surface modification by means of hyperbranched polyethylenimine (PEI) further lowers the pore diameter to 0.85 nm and MWCO to 680 Da. The membrane surface also becomes more hydrophilic and positively charged after the PEI modification. Because of the synergistic effects from size exclusion and charge repulsion, the newly developed NF hollow fibers show high permeation fluxes of 7.0–71.2 L·m~(–2)·h~(–1) and great rejections of 95.5–99.9% to various dyes at a low operating pressure of 1 bar. At the same time, they have ultralow rejections of less than 10% to inorganic salts (i.e., Na_(2)SO_(4)), suggesting that more than 90% of the salts would permeate through the fibers. In addition, the two hollow fibers exhibit outstanding performance stability, low fouling tendency, and great fouling reversibility. Their fluxes can be brought back to be more than 80% of the original values by a simple physical backwash. The newly developed loose NF hollow fiber membranes may have great potential for effective fractionation and treatment of textile wastewater.
机译：在这项工作中，开发了具有超高水渗透性和明确的纳米孔和表面电荷特性的新型松散纳米过滤（NF）中空纤维膜，用于有效分馏纺织品废水中的染料和无机盐。初纺NF中空纤维具有80 L·m〜（–2）·h〜（-1）·bar〜（-1）的高纯水渗透率（PWP），且孔径小，直径为1.0 nm MWCO为1000 Da通过超支化聚乙烯亚胺（PEI）进行的表面改性进一步将孔径降低至0.85 nm，将MWCO降低至680 Da。在PEI改性后，膜表面也变得更加亲水并带正电。由于尺寸排阻和电荷排斥的协同作用，新开发的NF中空纤维表现出7.0–71.2 L·m〜（–2）·h〜（–1）的高渗透通量和95.5–99.9％的高截留率。在1 bar的低工作压力下使用各种染料。同时，它们对无机盐（即Na_（2）SO_（4））的排斥率低于10％，这表明超过90％的盐会透过纤维。另外，两种中空纤维表现出优异的性能稳定性，低结垢趋势和大的结垢可逆性。通过简单的物理反冲洗，它们的通量可以恢复到原始值的80％以上。新开发的疏松NF中空纤维膜可能具有有效分馏和处理纺织废水的巨大潜力。

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  • 来源
    《Environmental Science & Technology》 |2018年第6期|3676-3684|共9页
  • 作者

    Gang Han; Tai-Shung Chung; Martin Weber; Christian Maletzko;

  • 作者单位

    Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Singapore;

    Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore, 117585, Singapore;

    Advanced Materials and Systems Research, BASF SE, RAP/OUB-B001, Ludwigshafen, 67056, Germany;

    Performance Materials, BASF SE, G-PMF/SU-F206, Ludwigshafen, 67056, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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