中文摘要：膜分离法能有效去除水中细菌和病毒等病原体。但彻底快速去除病原体需要高渗透性及选择性的膜。本研究使用碳纳米管（CNT）制备这种膜。首先用两亲性嵌段共聚物聚（2-甲基丙烯酸二甲氨基乙酯）-嵌段聚苯乙烯（PDMAEMA-b-PS，缩写为BCP）分散CNT。PS嵌段通过p-p相互作用吸附在CNT表面，而PDMAEMA嵌段被溶剂化，从而形成均匀稳定的CNT分散体。然后将碳纳米管分散体喷涂在多孔基底上，制备以组装碳纳米管层作为选择性层的复合膜。研究证明，优化后，膜对噬菌体病毒和细菌（大肠杆菌）的截留率为100%，同时透水率高达3300 L m（-2）h（-1）bar（-1）。本研究合成的BCP/CNT膜，其性能优于目前最先进的膜及商用膜。由大面积膜片组装而成的膜组件具有彻底快速去除病毒和细菌的能力。
外文摘要：Membrane separation is able to efficiently remove pathogens like bacteria and viruses from water based on size exclusion. However, absolute and fast removal of pathogens requires highly permeable but selective membranes. Herein, we report the preparation of such advanced membranes using carbon nanotubes (CNTs) as one-dimensional building blocks. We first disperse CNTs with the help of an amphiphilic block copolymer, poly(2- dimethylaminoethyl methacrylate)- block-polystyrene (PDMAEMA-b-PS, abbreviated as BCP). The PS blocks adsorb on the surface of CNTs via the p-p interaction, while the PDMAEMA blocks are solvated, thus forming homogeneous and stable CNT dispersions. We then spray the CNT dispersions on porous substrates, producing composite membranes with assembled CNT layers as the selective layers. We demonstrate that the optimized membrane shows 100% rejection to phage viruses and bacteria (Escherichia coli) while giving a water permeance up to similar to 3300 L m(-2) h(-1) bar(-1). The performance of the resultant BCP/ CNT membrane outperforms that of state-of-the-art membranes and commercial membranes. The BCP/CNT membrane can be used for multiple runs and regenerated by water rinsing. Membrane modules assembled from large-area membrane sheets sustain the capability of absolute and fast removal of viruses and bacteria.
外文关键词：carbon nanotube；spray coating；block copolymer；bacterium；virus
作者：Ma, DW；Li, HY；Meng, ZX；Zhang, CX；Zhou, JM；Xia, JZ；Wang, Y
作者单位：Nanjing Tech Univ；Beijing OriginWater Membrane Technol Co Ltd；Shenzhen Univ
期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY
期刊影响因子：7.864
出版年份：2021
出版刊次：22
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