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首页> 外文期刊>Environmental Science & Technology >Concentration and Recovery of Dyes from Textile Wastewater Using a Self-Standing, Support-Free Forward Osmosis Membrane
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Concentration and Recovery of Dyes from Textile Wastewater Using a Self-Standing, Support-Free Forward Osmosis Membrane

机译：使用自支撑，无支撑的正向渗透膜从纺织废水中浓缩和回收染料

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摘要

Forward osmosis (FO) can potentially treat textile waste-waters with less fouling than pressure-driven membrane processes such as reverse osmosis and nanofiltration. However, conventional FO membranes with asymmetric architecture experience severe flux decline caused by internal concentration polarization and fouling as dye molecules accumulate on the membrane surface. In this study, we present a new strategy for concentrating dye by using a self-standing, support-free FO membrane with a symmetric structure. The membrane was fabricated by a facile solution casting approach based on a poly(triazole-co-oxadiazole-co-hydrazine) (PTAODH) skeleton. Due to its dense architecture, ultrasmooth surface, and high negative surface charge, the PTAODH membrane exhibits excellent FO performance with minimal fouling, low reverse salt flux, and negligible dye passage to the draw solution side. Cleaning with a 40% alcohol solution, after achieving a concentration factor of similar to 10, resulted in high flux recovery ratio (98.7%) for the PTAODH membrane, whereas significant Foulants damage to the active layers of two commercial FO membranes was observed. Moreover, due to the existence of cytotoxic oxadiazole and triazole moieties in the polymer structure, our PTAODH membrane exhibited an outstanding antibacterial property with two model bacteria. Our results demonstrate the promising application of the symmetric PTAODH membrane for the concentration of textile wastewaters and its superior antifouling performance compared to state-of-the-art commercial FO membranes.
机译：与反渗透和纳滤等压力驱动的膜工艺相比，正渗透（FO）可以潜在地减少污染，从而处理纺织品废水。但是，具有不对称结构的常规FO膜会由于内部浓度极化和结垢而导致严重的通量下降，因为染料分子会积聚在膜表面。在这项研究中，我们提出了一种通过使用具有对称结构的自立式，无支撑的FO膜浓缩染料的新策略。通过基于聚三唑-共二恶唑-肼（PTAODH）骨架的简便溶液流延方法制造该膜。由于其致密的结构，超光滑的表面和高的负表面电荷，PTAODH膜表现出出色的FO性能，具有最小的结垢，低的逆盐通量和可忽略的染料进入汲取溶液一侧。在达到接近10的浓缩系数后，用40％的酒精溶液进行清洗，可导致PTAODH膜的通量回收率高（98.7％），而观察到的污垢则严重破坏了两种市售FO膜的活性层。此外，由于聚合物结构中存在细胞毒性的恶二唑和三唑部分，我们的PTAODH膜对两种模型细菌均表现出出色的抗菌性能。我们的结果表明，与最新的商业FO膜相比，对称PTAODH膜在纺织废水浓缩中具有广阔的应用前景，并且其优异的防污性能。

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  • 来源
    《Environmental Science & Technology》 |2019年第6期|3078-3086|共9页
  • 作者

    Li Meng; Wang Xi; Porter Cassandra J.; Cheng Wei; Zhang Xuan; Wang Lianjun; Elimelech Menachem;

  • 作者单位

    Nanjing Univ Sci & Technol, Key Lab New Membrane Mat, Minist Ind & Informat Technol, Sch Environm & Biol Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Nanjing Univ Sci & Technol, Sch Chem Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06520 USA;

    Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06520 USA;

    Nanjing Univ Sci & Technol, Key Lab New Membrane Mat, Minist Ind & Informat Technol, Sch Environm & Biol Engn, Nanjing 210094, Jiangsu, Peoples R China|Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06520 USA;

    Nanjing Univ Sci & Technol, Key Lab New Membrane Mat, Minist Ind & Informat Technol, Sch Environm & Biol Engn, Nanjing 210094, Jiangsu, Peoples R China;

    Yale Univ, Dept Chem & Environm Engn, New Haven, CT 06520 USA;

  • 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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