Nanocomposite
Membranes via the Codeposition of Polydopamine/Polyethylenimine with
Silica Nanoparticles for Enhanced Mechanical Strength and High Water
Permeability
Yan Lv
Yong Du
Wen-Ze Qiu
Zhi-Kang Xu
10.1021/acsami.6b13761.s001
https://acs.figshare.com/articles/journal_contribution/Nanocomposite_Membranes_via_the_Codeposition_of_Polydopamine_Polyethylenimine_with_Silica_Nanoparticles_for_Enhanced_Mechanical_Strength_and_High_Water_Permeability/4531079
A defect-free
and stable selective layer is of critical significance for thin film
composite membrane with excellent separation performance and service
durability. We report a facial strategy for fabricating thin film
nanocomposite (TFN) nanofltration membranes (NFMs) based on the codeposition
of polydopamine, polyetheylenimine, and silica nanoparticles. Tripled
water flux can be obtained from the TFN NFMs as compared with those
NFMs without silica nanoparticles. This is ascribed to the improved
wettability of the membrane surfaces and the enlarged pore sizes of
the selective layer. The interfacial compatibility of the inorganic
fillers and the polymer matrices can be enhanced by the electrostatic
interactions of silica nanoparticles with polyethylenimine and the
adhesive characteristics of polydopamine, resulting in a defect-free
selective layer and then good rejection for both bivalent cations
and neutral solutes. The rigid silica nanoparticles also improve the
surface mechanical strength of the TFN NFMs effectively and lead to
structural stability and compaction resistance during the long-term
filtration process.
2016-12-21 00:00:00
defect-free
surface
High Water Permeability
film
Tripled water flux
membrane
silica nanoparticles
TFN NFMs
polydopamine
Enhanced Mechanical Strength