Han Yi, Jiang Yanqiu, Gao Chao
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China.
ACS Appl Mater Interfaces. 2015 Apr 22;7(15):8147-55. doi: 10.1021/acsami.5b00986. Epub 2015 Apr 9.
A sort of novel high-flux nanofiltration membrane was fabricated by synergistic assembling of graphene and multiwalled carbon nanotubes (MWNTs), in which graphene played the role of molecular sieving and MWNTs expanded the interlayer space between neighbored graphene sheets. The MWNT-intercalated graphene nanofiltration membrane (G-CNTm) showed a water flux up to 11.3 L m(-2) h(-1) bar(-1), more than 2 times that of the neat graphene nanofiltration membrane (GNm), while keeping high dye rejection (>99% for Direct Yellow and >96% Methyl Orange). The G-CNTm also showed good rejection ratio for salt ions (i.e., 83.5% for Na2SO4, 51.4% for NaCl). We also explored the antifouling performance of G-CNTm and GNm with bovine serum albumin (BSA), sodium alginate (SA) and humic acid (HA). Both G-CNTm and GNm possessed excellent antifouling performance for SA and HA but inferior for BSA because of the strong interaction between protein and graphene sheets.
通过石墨烯与多壁碳纳米管（MWNTs）的协同组装制备了一种新型高通量纳滤膜，其中石墨烯起到分子筛分的作用，而多壁碳纳米管则扩大了相邻石墨烯片层之间的层间距。MWNT插层的石墨烯纳滤膜（G-CNTm）的水通量高达11.3 L m(-2) h(-1) bar(-1)，是纯石墨烯纳滤膜（GNm）的2倍多，同时保持了对染料的高截留率（直接黄>99%，甲基橙>96%）。G-CNTm对盐离子也表现出良好的截留率（即Na2SO4为83.5%，NaCl为51.4%）。我们还研究了G-CNTm和GNm对牛血清白蛋白（BSA）、海藻酸钠（SA）和腐殖酸（HA）的抗污染性能。由于蛋白质与石墨烯片层之间存在强相互作用，G-CNTm和GNm对SA和HA都具有优异的抗污染性能，但对BSA的抗污染性能较差。
