A Self-Cleaning Heterostructured Membrane for Efficient Oil-in-Water Emulsion Separation with Stable Flux
A Self-Cleaning Heterostructured Membrane for Efficient Oil-in-Water Emulsion Separation with Stable Flux
复制标题
一种具有稳定通量的高效油水乳液分离自清洁异质结构膜
DOI：
10.1002/adma.202001265
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发表时间：
2020-05-13
影响因子：
29.4
通讯作者：
Lu, Jianmei
中科院分区：
文献类型：
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作者：
Cai, Yahui;Chen, Dongyun;Lu, Jianmei
缺乏清洁水是一项重大的全球挑战。膜分离技术具有低能耗、低成本等优点，是处理工业、生活污水的理想选择。然而，膜极易受到污染，特别是在废水处理过程中，这限制了其在该领域的实际应用。同样，膜的通量随着使用时间的延长而降低，这是由于膜间间距的减小。制备具有抗污染性能和稳定通量的膜是解决这一问题的关键。在这项研究中，通过自组装工艺制备了具有可见光驱动自清洁性能的二维异质结构膜。值得注意的是，坡缕石的加入增加了石墨烯和异质结结构的层间间距，从而增加了膜的通量，避免了膜在压力下层间间距的减小。具有可见光催化性能的异质结的存在有效地避免了膜污染，避免了渗透通量的急剧下降。重要的是，所制备的二维膜对油水乳液具有良好的分离性能，具有高通量和高效率。这些特点表明所制备的二维膜在废水处理中的应用具有很大的潜力。
Lack of clean water is a major global challenge. Membrane separation technology is an ideal choice for the treatment of industrial, domestic sewage owing to its low energy consumption and cost. However, membranes are highly susceptible to contamination, particularly during wastewater treatment, which has limited their practical applications in this field. Similarly, the flux of the membrane decreases with prolonged use due to its reduced interlayer spacing. Preparation of membranes with anticontamination properties and stable flux is the key to addressing this problem. In this study, a 2D heterostructure membrane with visible‐light‐driven self‐cleaning performance is prepared via a self‐assembly process. Notably, the addition of palygorskite increases the interlayer spacing of the graphene and heterojunction structures, which increases the flux of the membrane and avoids a decrease of the interlayer spacing of the membrane under pressure. The presence of a heterojunction with visible light catalytic properties effectively avoids membrane fouling and avoids a sharp decrease of the permeation flux. Importantly, the prepared 2D membrane has excellent separation performance for oil–water emulsions with both high flux and efficiency. These features suggest great potential for the prepared 2D membrane in wastewater treatment applications.