期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 222, 期 -, 页码 2603-2614出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2022.10.043
关键词
Biomimetic; Spider web structure; Carboxymethyl cellulose; Superhydrophilic membrane; Oil-water emulsion separation
资金
- National Natural Science Foundation of China [22078244]
- Scientific research and development project of China Petrochemical Corporation [ST22059]
In this work, a superwetting membrane with a spider web structured gel layer was designed for efficient oil-water separation. The fabricated membrane exhibited superhydrophilicity and underwater superoleophobicity, and showed efficient oil-water separation capacity. Additionally, the spiderwebstructured gel layer on the membrane surface displayed good mechanical stability.
Superhydrophilic and underwater superoleophobic membranes have recently attracted significant interest as materials for effective oil-water emulsion separation. In this work, a superwetting membrane with a spider web structured gel layer was designed for efficient oilwater separation. Biomaterial, carboxymethyl cellulose (CMC), was used as the raw material, a spider web structured gel layer was constructed on the PVDF membrane surface by heat-treatment and chemical crosslinking. The hydrophilic gel layer imparted excellent superhydrophilic and underwater superoleophobic properties to the membrane, while the special spider web structure improved the membrane mechanical stability. The fabricated membrane exhibited superhydrophilicity and underwater superoleophobicity. Among different CMC concentration-modified membranes, the M-0.5 membrane containing 0.5 wt% CMC exhibited a flux of 612 L center dot m 2 h 1 during dichloromethane oil-water emulsion separation, which was 4.2-fold higher than that of the pristine PVDF membrane, while the membrane showed efficient oil-water separation capacity. Additionally, the water flux recovery reached as high as 93.3 %, and oil rejection attained 99.1 %. Meanwhile, the spiderwebstructured gel layer on the membrane surface displayed good mechanical stability. In summary, this novel membrane-modification method, inspired by the spider web structure, was simple, cost effective and environmentally friendly, thereby making it promising for future preparation of highly efficient oil-water emulsion separation membranes.
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