Ultrathin Graphene Nanofiltration Membrane for Water Purification
Ultrathin Graphene Nanofiltration Membrane for Water Purification
复制标题
用于水净化的超薄石墨烯纳滤膜
DOI：
10.1002/adfm.201202601
复制
发表时间：
2013-08-07
影响因子：
19
通讯作者：
Gao, Chao
中科院分区：
文献类型：
--
作者：
Han, Yi;Xu, Zhen;Gao, Chao
提出了一种在微孔基板上制备超薄（约22-53 nm厚）石墨烯纳滤膜（uGNMs）的方法，用于化学转化石墨烯（CCG）的高效水净化。通过扫描电子显微镜、原子力显微镜和透射电子显微镜对制备的石墨烯纳米管进行了表征。在死端过滤装置上评价了uGNMs的水处理性能，uGNMs的纯水通量高(21.8 L m(-2) h（-1) bar(-1)）。ugnm对有机染料的保留率高（约99%），对离子盐的保留率中等（约20-60%）。对这类带负电膜的过滤机理进行了深入的研究，结果表明物理筛分和静电相互作用主导了过滤过程。由于石墨烯纳米管的超薄特性，34 mg的CCG足以制作1平方米的纳滤膜，这表明新一代石墨烯基纳滤技术具有资源节约和成本效益高的优点。高性能、低成本和基于溶液的简单制造工艺的集成为ugnm在实际水净化中提供了巨大的应用潜力。
A method of fabricating ultrathin (approximate to 22-53 nm thick) graphene nanofiltration membranes (uGNMs) on microporous substrates is presented for efficient water purification using chemically converted graphene (CCG). The prepared uGNMs show well packed layer structure formed by CCG sheets, as characterized by scanning electron microscopy, atomic force microscopy, and transmission electron microscopy. The performance of the uGNMs for water treatment was evaluated on a dead end filtration device and the pure water flux of uGNMs was high (21.8 L m(-2) h(-1) bar(-1)). The uGNMs show high retention (>99%) for organic dyes and moderate retention (approximate to 20-60%) for ion salts. The rejection mechanism of this kind of negatively charged membranes is intensively studied, and the results reveal that physical sieving and electrostatic interaction dominate the rejection process. Because of the ultrathin nature of uGNMs, 34 mg of CCG is sufficient for making a square meter of nanofiltration membrane, indicating that this new generation graphene-based nanofiltration technology would be resource saving and cost-effective. The integration of high performance, low cost, and simple solution-based fabrication process promises uGNMs great potential application in practical water purification.