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首页> 外文期刊>Environmental Science & Technology >Electrokinetic Enhancement of Water Flux and Ion Rejection through Graphene Oxide/Carbon Nanotube Membrane
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Electrokinetic Enhancement of Water Flux and Ion Rejection through Graphene Oxide/Carbon Nanotube Membrane

机译：通过石墨烯/碳纳米管膜的水通量和离子抑制的电动提高

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摘要

Graphene oxide (GO) is promising for constructing next-generation high-performance membranes for water treatment and desalination. However, GO-based membranes are still subjected to low ion rejection or limited water flux. Herein, the electrokinetic effect is employed as a new strategy for the coenhancement of water flux and ion rejection through an ethylenediamine-polystyrenesulfonate intercalated graphene oxide/carbon nanotube (GO&EDA-PSS/CNT) asymmetric membrane. Benefiting from the external voltage applied across the GO&EDA-PSS layer, the electrokinetically driven water transport velocity is significantly increased from 0 to 23.7 μm s~(-1) with increasing the voltage from 0 to 3.0 V. As a result, the water flux is improved from 9.1 to 17.4 L m~(-2) h~(-1) under a transmembrane pressure of 1 bar. Simultaneously, the rejection rate for NaCl is increased from 52.4% to 78.3%. Numerical analysis reveals that the increased rejection rate is attributed to the electrokinetic enhancements of water transport through the membrane and ion partitioning between the membrane and bulk solution. These results indicate that the assistance of the electrokinetic effect is an effective means to improve membrane filtration performance, which provides a new perspective on the design of advanced membranes for achieving high water flux and rejection efficiency.
机译：石墨烯氧化物（GO）很有希望构建用于水处理和脱盐的下一代高性能膜。然而，基于去的膜仍然经受低离子排斥或有限的水通量。这里，电动效应是通过乙二胺 - 聚苯乙烯磺酸酯插入的石墨烯氧化物/碳纳米管（GO＆EDA-PS / CNT）不对称膜的新的水通量和离子抑制的新策略。受益于施加在Go＆EDA-PSS层上的外部电压，电动驱动的水输送速度从0到23.7μmS〜（-1）显着增加，随着0到3.0 V的电压增加，水通量在1巴的跨膜压力下从9.1至17.4 L m〜（-2）H〜（-1）改善。同时，NaCl的排斥率从52.4％增加到78.3％。数值分析表明，增加的排斥率归因于通过膜和堆积溶液之间的膜和离子分配的水输送的电动性改进。这些结果表明电动效应的辅助是改善膜过滤性能的有效手段，这为实现高水通量和排斥效率的先进膜设计提供了一种新的视角。

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  • 来源
    《Environmental Science & Technology》 |2020年第23期|15433-15441|共9页
  • 作者

    Haiguang Zhang; Xie Quan; Shuo Chen; Hongtao Yu; Junfeng Niu;

  • 作者单位

    Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education China) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education China) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education China) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China;

    Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education China) School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China;

    Research Center for Eco-Environmental Engineering Dongguan University of Technology Dongguan 523808 China;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    membrane; graphene oxide; carbon nanotube; external voltage; electrokinetic effect;

    机译：膜;石墨烯氧化物;碳纳米管;外部电压;电动效应;

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