Layer-by-Layer Construction of Cu2+/Alginate Multilayer Modified Ultrafiltration Membrane with Bioinspired Superwetting Property for High-Efficient Crude-Oil-in-Water Emulsion Separation
Layer-by-Layer Construction of Cu2+/Alginate Multilayer Modified Ultrafiltration Membrane with Bioinspired Superwetting Property for High-Efficient Crude-Oil-in-Water Emulsion Separation
复制标题
逐层构建具有仿生超润湿特性的Cu2/海藻酸盐多层改性超滤膜用于高效原油水包油乳液分离
DOI：
10.1002/adfm.201801944
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发表时间：
2018-12-05
影响因子：
19
通讯作者：
Jin, Jian
中科院分区：
文献类型：
--
作者：
Gao, Shoujian;Zhu, Yuzhang;Jin, Jian
由于原油具有高度的粘附性，因此更容易附着在污垢滤膜上。水包原油乳状液的分离一直是一项艰巨的工作。低粘、超疏油性能的水凝胶是实现水包原油乳状液高效防污染分离的理想滤膜材料。制备水凝胶改性滤膜的一个关键挑战是设计出具有足够的抗原油污染能力和厚度可控的超薄水凝胶层，从而不堵塞微米和纳米级的膜孔。受富含藻酸盐的海藻这种新型的耐恶劣环境的超疏油特性的启发，通过层层自组装的方法在聚合物滤膜上构建了厚度在纳米级可控的超薄Cu2+/藻酸盐水凝胶多层膜。纳米孔和原膜的高通量都得到了很好的保持。Cu2+/海藻酸盐多层改性超滤膜具有仿生超亲水性、水下超疏油能力和对原油的防污染能力。它能有效地分离水包原油乳状液，水通量为1230 L m(-2)h(-1)bar(-1)，超高效率为99.8%，并具有良好的防垢和循环能力。此外，该膜具有良好的耐盐性、抗菌能力和长期稳定性。
Due to highly adhesive property, crude oil is easier to adhere on foul filtration membranes. Separation of crude oil-in-water emulsion is a continuing tough work. Hydrogels with low-adhesive superoleophobicity are ideal materials for modifying filtration membranes to achieve efficient and antifouling separation of crude oil-in-water emulsion. A key challenge in fabricating the hydrogel modified filtration membranes is to design an ultrathin hydrogel layer with sufficient anti-crude-oil-fouling ability and with controllable thickness, thus not blocking the micro- and nanosized membrane pores. Inspired by the novel harsh-environment-tolerant superoleophobicity of alginate-rich seaweed, the construction of an ultrathin Cu2+/alginate hydrogel multilayer with controllable thickness at the nanometer scale on a polymer filtration membrane via a layer-by-layer self-assembly method is achieved. Both the nanosized pores and the high flux of original membrane are well-maintained. The Cu2+/alginate multilayer modified ultrafiltration membrane behaves a biomimetic superhydrophilicity, underwater superoleophobicity, and antifouling ability for crude oil. It is capable of efficiently separating crude oil-in-water emulsion with a high water flux of 1230 L m(-2) h(-1) bar(-1), an ultrahigh efficiency of 99.8%, and an outstanding antifouling and cyclic ability. What's more, the membrane exhibits good salt-tolerance, antibacterial ability, and long-term stability.