Exploring the sandwich antibacterial membranes based on UiO-66/graphene oxide for forward osmosis performance
Exploring the sandwich antibacterial membranes based on UiO-66/graphene oxide for forward osmosis performance
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探索基于UiO-66/氧化石墨烯的夹层抗菌膜的正向渗透性能
DOI：
10.1016/j.carbon.2018.12.050
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发表时间：
2019
期刊：
影响因子：
10.9
通讯作者：
Sun Daofeng
中科院分区：
文献类型：
--
作者：
Pang Jia;Kang Zixi;Wang Rongming;Xu Ben;Nie Xinyu;Fan Lili;Zhang Fuxin;Du Xinxin;Feng Shou;Sun Daofeng
正渗透（FO）是一种新兴的膜过程驱动的渗透压梯度的淡水生产。低水通量、溶质逆向扩散和膜生物污染是影响FO性能的三个主要问题，膜材料是解决这些问题的关键之一。氧化石墨烯（GO）膜具有高的水通量，表明其在水净化领域的应用前景。然而，精确控制GO膜的孔径对于有效的离子筛分是必要的。在这项工作中，亲水性金属-有机骨架（UiO-66）纳米粒子，作为微孔填料，插入到GO层，形成双“三明治”膜，以改善FO性能。结合的UiO-66引入了均匀和合适的纳米通道，可以有效地允许水渗透通过，同时阻碍Na+离子的溶质。此外，形成纳米厚膜的基质的GO层具有抗微生物活性（90%的抑菌），这将防止生物污染。在FO模型中，UiO-66/GO膜表现出29.16 LMH的水通量，比原始GO膜高270%，而反向溶质扩散减少了83.5%（12.86 gMH）。
Forward osmosis (FO) is an emerging membrane process driven by the osmotic pressure gradient for freshwater production. Low water flux, reverse solute diffusion, and membrane biofouling are three major issues affecting the FO performances, and the membrane material is one of the keys to solve them. The graphene oxide (GO) membrane exhibits high water flux, indicating its promising potential for application in the field of water purification. However, precisely control of the pore size of the GO membranes is necessary for efficient ion sieving. In this work, the hydrophilic metal-organic framework (UiO-66) nanoparticles, as the microporous fillers, are intercalated into the GO layers to form ultrathin "sandwich" membranes for improving the FO performances. The incorporated UiO-66 introduces uniform and suitable nanochannels that can effectively allow water to permeate through, while hinder the solutes of Na+ions. Furthermore, the GO layers form the matrix of nanometer-thick membranes possess the antimicrobial activity (bacteriostasis of 90%), which would prevent the biofouling. In the FO model, the UiO-66/GO membrane exhibits a water flux of 29.16 LMH, which was 270% higher than the pristine GO membrane, while the reverse solute diffusion was reduced by 83.5% (12.86 gMH).