Professor James Economy's Group
|
|
[Activated Carbon Fibers] [Ion Exchange Fibers] [Chelating Fibers] [Membranes] [Porous Inorganic Fibers] Advanced
Membranes for Desalination and Wastewater Treatment The objective
of this project is to develop low fouling, cost
effective, durable reverse osmosis (RO) and
nanofiltration (NF) membranes for desalination and
wastewater treatment which greatly outperform current
state-of-the-art RO and NF membranes. We are currently
preparing and screening a series of new membrane
materials including aromatic liquid crystalline,
non-liquid crystalline thermosetting polyesters,
hyperbranched poly(imide-ester)s and
poly(imide-silsesquioxane)s, hyperbranched
aromatic poly(amide-silsesquioxane)s and
poly(amide-urea)s, cross-linked functional
poly(etheretherketone)s, selected high temperature
polymers including polyquinoline, polyquinoxaline,
polybenzthiazole, polybenzoxazole, polybenzimidazole, and
ladder polymers based on some of these structures, etc.
These membrane materials will be used to develop dense
and thin-film composite (TFC) membranes. At the same time
we will determine the efficiency of such membranes for
desalination and wastewater treatment. The most promising
systems will be modified further to control the membrane
properties. A variation on the above theme will involve
taking advantage of work currently underway in the
microelectronics industry to prepare dielectric films
with closed micropores to determine any possible
advantages to that kind of morphology. Thin-film composite
membranes as shown above for desalination will be
developed by spin-coating or dip-coating the
as-synthesized materials (material A) on the surface of
the porous support (material B) such as polysulfone or
ceramic membrane. Evaluation of the prepared
membranes for desalination will be carried out using the
above filtration cell housing. The membrane will be
placed on a support screen and sealed in filter holder
using an O-ring assembly. This filtration cell will be
used for initial proof-of-concept demonstrations and will
be incorporated into an in-house built system. Activated
Microporous Membranes These
membranes will have continuous pore structures on the
order of 10 angstroms with carefully controlled pore
chemistry (acidic vs. basic character) analogous to
activated carbon materials currently produced by this
group. When pore size and surface chemistry is
optimized this should allow polar water molecules to pass
but not ionic molecules. It is believed that this
technology will compete with reveres osmosis (RO)
membranes for desalination and microporous membranes for
other water purification applications such as organics
removal. These activated membranes should have numerous
advantages over RO such as lowered pressure drop,
increased flow rate, greater strength and fouling
resistance. |
||||||||||||||||||||||||||||||||||||||||||||||||||||||