NAMS 2002 Workshop - ICOM 2008

Composite Polymeric Membrane Formation – 6
Monday July 14, 5:00 PM-5:30 PM, Waialua
Study on Improvement of Composite Reverse Osmosis Membranes
C. Gao (Speaker), The Development Center of Water Treatment Technology, Hanzhou, China,
gaocjie@mail.hz.zj.cn
Y. Zhou, The Development Center of Water Treatment Technology, Hanzhou, China
Q. An, College of Materials Science and Chemistry, Zhejiang University, Hangzhou, China
S. Yu, The Development Center of Water Treatment Technology, Hanzhou, China
L. Wu, The Development Center of Water Treatment Technology, Hanzhou, China
The current worldwide expansion of the RO application has resulted from the
introduction of thin-film-composite (TFC) membranes by interfacial
polycondensation. The TFC membranes are composed of thin skin layers and
supporting substrates. Some studies have been carried out recent years on the
improvements of both the skin layers and supporting substrates. For the
improvements of supporting substrates, the relationship between cloud point,
zero viscosity and rheological properties of casting solution and structure and
performance of membrane was analyzed. The formation mechanism of phase
inversion membrane was investigated. The supporting PSF membranes with
cross-section structures of sponge-like with density gradient were obtained. For
the improvements of thin skin layers, a few of functional monomers such as
SMPD, HDA, ICIC and CFIC, for interfacial polymerization were synthesized. The
effect of compositions of water phase (diamine) and oil phase (carbonyl chloride)
on membrane performance were investigated. The procedure and parameter
control of membrane preparation were optimized. The post treatment of obtained
TFC membrane was conducted for further improvement. The relation between
among performance and chemical structure, morphology of membranes was
investigated. The composite membranes with high flux, high rejection and antifouling
property were produced comparing with original membranes.