期刊
JOURNAL OF MEMBRANE SCIENCE
卷 660, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2022.120829
关键词
Bioinspired surface; Zwitterionic functionalization; Superhydrophilic membrane; Oil/water emulsion separation; Anti-fouling
资金
- National Natural Science Foundation of China [21878177, 22078175]
- Natural Science Foundation of Shandong Province [ZR2019LFG003, ZR2021LFG010]
- Foundation of Shandong Development and Reform Commission [[2020]1220]
Developing efficient polymeric membranes for the purification of emulsified oily wastewater is challenging. This study presents a novel surface design inspired by saltwater fish and mussel to achieve superhydrophilicity and anti-oil fouling capability of the membrane. The modified membrane exhibits high water permeability and excellent oil rejection, making it promising for practical oily sewage remediation.
Developing efficient polymeric membranes for the purification of emulsified oily wastewater is of great significance but still challenging, restricted by low flux and severe membrane fouling. Endowing the intrinsically hydrophobic membranes with excellent hydrophilicity thus robust oil-fouling resistance in a facile and universal manner is highly desired. Herein, inspired by saltwater fish and mussel, we report a delicate zwitterionic surface design via co-assembly of 3-aminopropyldimethylamine oxide (APDMAO) and dopamine. Taking advantage of the direct connected positively charged and negatively charged moieties (N+-O-), APDMAO could strongly interact with water molecules via hydrogen bonds thus form a robust hydration barrier as revealed by molecular dynamics (MD) simulations and sum frequency generation (SFG) vibrational spectroscopy. Besides, APDMAO could bond with dopamine via both covalent and noncovalent interactions to regulate coating behavior and improve coating stability. Owing to the superhydrophilicity of APDMAO and the distinct adhesion of polydopamine, the modified membrane exhibits robust superhydrophilicity, underwater superoleophobicity and anti-oil-fouling capability. Consequently, the resultant membrane achieves an ultra-high water permeability of 5163 L m(-2) h(-1) bar(-1) accompanied with an excellent oil rejection of 99.7% for the separation of mineral oil-in-water emulsion. Additionally, the separation performance remains rather stable during 20 cycles of emulsion filtration. The modified membrane also exhibits desired durability and antibacterial property, demonstrating its great promise in practical oily sewage remediation.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据