کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6465794 | 1422957 | 2017 | 12 صفحه PDF | دانلود رایگان |
- MWCNTs decorated PVDF membrane was obtained through a simple dip-coating method.
- The modified membrane has superhydrophilicity and underwater superoleophobicity.
- The membrane exhibits high flux (â¼900Â LMH) and excellent efficiency (>99%).
- The modified membrane shows excellent stability and flux recovery.
The intrinsic hydrophobicity of polyvinylidene fluoride (PVDF) membrane impedes its application in the field of water treatment. In this work, hydrophilic modification of PVDF membrane is processed by a mussel-inspired method. Multi-wall carbon nanotubes (MWCNTs) were functionalized by grafting 3-aminopropyltriethoxysilane (APTES) firstly, and then they were directly decorated on PVDF membrane surface by dopamine copolymerizes. Energy dispersive X-ray spectrometry (EDX) mapping results exhibited that functionalized MWCNTs were well dispersed in the membrane matrix. The novel membranes turned from a hydrophobic state to superhydrophilic state (completely wetted in air within only 1Â s). Besides, these provide modified membranes could be applied to separate different kinds of oil-in-water emulsions with high permeate flux (about 900Â L/m2Â h under 0.09Â MPa) and ultrahigh oil rejection ratio (nearly 99%). More importantly, the as-prepared superhydrophilic PVDF membranes showed durable oil-fouling repellency, which could be easily recycled with a recovery of flux ratio up to 90%. In general, this bio-inspired modification might provide a new method for the preparation of superhydrophilic PVDF membrane and be very promising for application on oil/water emulsion separation.
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Journal: Chemical Engineering Journal - Volume 321, 1 August 2017, Pages 245-256