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首页> 外文期刊>Environmental Science & Technology >Carbon Quantum Dots Grafted Antifouling Membranes for Osmotic Power Generation via Pressure-Retarded Osmosis Process
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Carbon Quantum Dots Grafted Antifouling Membranes for Osmotic Power Generation via Pressure-Retarded Osmosis Process

机译：碳质量子点嫁接的防污膜，用于通过压力滞后渗透过程进行渗透发电

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摘要

Osmotic power generated by pressure-retarded osmosis (PRO) has attracted global attention as a clean, abundant and renewable energy resource. However, the substrates of PRO membranes are particularly prone to fouling because of their direct contact with various foulants in raw water. This leads to a significant decline in power density and impedes the commercialization of PRO technology. In this work, a. facile surface modification method has been developed to obtain a new type of nanoparticle functionalized antifouling PRO membranes. Carbon quantum dots (CQDs), with an average size around 3.2 nm, are fabricated from citric acid via a simple method. Subsequently, they are immobilized onto the porydopamine (PDA) layer grafted on the substrate surface of poly(ether sulfone) (PES) membranes via covalent bonding. The bacteria diffusion tests show that the CQD modified PRO membranes possess much enhanced antibacterial activity and antibiofouling propensity. The continuous PRO operations at 15 bar also confirm that the CQD modified membranes exhibit a much higher power density (11.0 vs 8.8 W/m~2) and water recovery after backwash (94 vs 8996) than the unmodified ones. This study may open up a new avenue in the fabrication of nanostructure functionalized polymeric membranes for wastewater treatment and osmotic power generation.
机译：压力延迟渗透（PRO）产生的渗透力作为一种清洁，丰富和可再生的能源，已经引起了全球关注。但是，PRO膜的基材特别容易结垢，因为它们与原水中的各种污垢直接接触。这导致功率密度显着下降，并阻碍了PRO技术的商业化。在这项工作中已经开发了一种简便的表面改性方法来获得新型的纳米粒子功能化防污PRO膜。平均尺寸约为3.2 nm的碳量子点（CQD）是由柠檬酸通过一种简单的方法制成的。随后，将它们通过共价键固定在接枝到聚醚砜（PES）膜基材表面的porydopamine（PDA）层上。细菌扩散测试表明，经CQD改性的PRO膜具有增强的抗菌活性和抗生物结垢倾向。在15 bar的压力下连续PRO操作也证实了CQD改性膜比未改性膜表现出更高的功率密度（11.0对8.8 W / m〜2）和反洗后的水回收率（94对8996）。这项研究可能为废水处理和渗透发电的纳米结构功能化聚合物膜的制造开辟新途径。

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  • 来源
    《Environmental Science & Technology》 |2017年第23期|14016-14023|共8页
  • 作者

    Die Ling Zhao; Subhabrata Das; Tai-Shung Chung;

  • 作者单位

    Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585;

    Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585;

    Department of Chemical & Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, Singapore 117585;

  • 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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  • 正文语种 eng
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