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Surface Modification of Polyacrylonitrile Membrane by Chemical Reaction and Physical Coating: Comparison between Static and Pore-Flowing Procedures
journal contribution
posted on 2018-04-16, 08:14 authored by Yang Qin, Hu Yang, Zhenliang Xu, Feng LiThe influences of static and pore-flowing
procedures on the surface
modification of a polyacrylonitrile (PAN) ultrafiltration membrane
through chemical reaction and physical coating were investigated in
detail. For chemical modification by ethanolamine, a membrane modified
by the pore-flowing procedure showed a higher flux and different morphology.
The reasons were explained by two effects: the pore-flowing resistance
to the random thermal motion of PAN at high temperatures and different
reaction kinetics related to the reactant concentration profile on
the interface between the membrane and reaction solution and the kinetic
property of the fluid (driving force and miscibility) and reaction
(time and rate). For physical coating modification, a dense and flat
layer via a loose and random layer was formed during the pore-flowing
process and static process, which changed the flux and antifouling
property of the membrane. The membrane prepared by dead-end filtration
showed the best trade-off between the flux and antifouling property.
Overall, the procedure kinetics plays an important role in the optimization
of membrane modification.