膜
化学工程
选择性
渗透
化学
盐(化学)
逐层
图层(电子)
毛细管作用
膜技术
色谱法
材料科学
有机化学
复合材料
工程类
催化作用
生物化学
作者
Jing Yang,Zixu Zhang,Ligang Lin,Fengling Tang,Meina Xu,Zitian Liu,Xu Yang,Qiying Wang,Wensong Ma,Qi Cheng,Aishan He
标识
DOI:10.1016/j.cej.2023.147708
摘要
Accurate separation of dyes/salts is a crucial step in the treatment of dye-containing wastewater. Therefore, separation membranes with high permeability and high dye/salt selectivity are urgently required. In this study, an ultrathin gel layer of carboxymethyl cellulose was constructed on a poly(vinylidene fluoride) membrane surface. This gel layer contains a backbone support structure and provides the bionic-inspired capillary effect, which endows the membrane with the capability to realize the efficient separation of dyes and salts. The introduction of silver nanoparticles (Ag NPs) into the gel layer provides a skeleton support structure, which prevents the collapse of the gel layer, reduces the actual separation layer thickness, and decreases the mass transfer resistance. Moreover, the formation of capillaries between the numerous Ag NPs facilitates the rapid penetration of water molecules. Interestingly, this membrane exhibited excellent selectivity for dye/salt separation (dye removal >99.5 %, salt removal <10 %) while maintaining an exceptionally high water permeate flux (244.5 L/m2h). Moreover, the membrane exhibited excellent stability. This study demonstrates that the construction of organic/inorganic three-dimensional structures with capillary and skeletal support effects show promise potential for modification of dye/salt separation membranes.
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