However, the water can't be disinfected with chlorine because it degrades polyamid material. Now, researchers at Virginia Tech have created a new polymer membrane for RO that will not be degraded by chlorine.
They will present the research at the 232nd National Meeting of the American Chemical Society on September 10-14 in San Francisco.
"Our RO materials grew out of our work on proton exchange membrane (PEM) materials used in fuel cells," said James McGrath, University Distinguished Professor of Chemistry at Virginia Tech. "The polymer structure is similar, but PEM materials are treated with a dilute acid and the RO materials are treated with a salt to put them in the neutral form."
Last year, McGrath's group received funding from the Office of Naval Research (ONR) to develop an RO material that would not break down from chlorine. "We have suggested for some time that PEM materials could be used so our students quickly began sending sample materials for testing to Benny D. Freeman, chemical engineer at the University of Texas, Austin. And within a year we had a successful material. "People have been doing RO for 40 years, but not with this new material," McGrath said.
Post doctoral Associate Zhong-Biao Zhang will deliver a paper on how the new materials are made and how they work at 2:20 p.m. Wednesday, Sept. 13, in Salon B3 of the Marriott. Authors of "Synthesis of di-sulfonated poly(arylene ether sulfone) random copolymers as novel candidates for chlorine-resistant reverse osmosis membranes (PMSE 494)" are Zhang, Virginia Tech graduate students Guang-Yu Fan and Mehmet Sankir, Ho Bum Park and Freeman at the University of Texas, and McGrath.
The ONR has expanded the project to add Don Baird, professor of chemical engineering at Virginia Tech, to fabricate the membrane. "The material we created and evaluated in the first year was relatively thick," McGrath said. "To be competitive, it has to be a thin film so the water can pass through quickly -- 10 to 100 times thinner than our present samples. That is not trivial but we think we know how to do it."
The Virginia Tech research group has created an asymmetric membrane. Imagine rigid foam with a thin membrane skin. The separation takes place at the skin and the water passes quickly through the foam's large pores. Without the foam, the skin or film layer is not strong enough to withstand the pressure of RO.
McGrath is now looking for companies to work with to produce the new material.
He is also working on a different process to separate ethanol from water. "We think we can make membranes to do that too," he said.
Susan Trulove | EurekAlert!
Cryo-electron microscopy achieves unprecedented resolution using new computational methods
24.03.2017 | DOE/Lawrence Berkeley National Laboratory
How cheetahs stay fit and healthy
24.03.2017 | Forschungsverbund Berlin e.V.
Astronomers from Bonn and Tautenburg in Thuringia (Germany) used the 100-m radio telescope at Effelsberg to observe several galaxy clusters. At the edges of these large accumulations of dark matter, stellar systems (galaxies), hot gas, and charged particles, they found magnetic fields that are exceptionally ordered over distances of many million light years. This makes them the most extended magnetic fields in the universe known so far.
The results will be published on March 22 in the journal „Astronomy & Astrophysics“.
Galaxy clusters are the largest gravitationally bound structures in the universe. With a typical extent of about 10 million light years, i.e. 100 times the...
Researchers at the Goethe University Frankfurt, together with partners from the University of Tübingen in Germany and Queen Mary University as well as Francis Crick Institute from London (UK) have developed a novel technology to decipher the secret ubiquitin code.
Ubiquitin is a small protein that can be linked to other cellular proteins, thereby controlling and modulating their functions. The attachment occurs in many...
In the eternal search for next generation high-efficiency solar cells and LEDs, scientists at Los Alamos National Laboratory and their partners are creating...
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are less stable. Now researchers at the Technical University of Munich (TUM) have, for the first time ever, produced a composite material combining silicon nanosheets and a polymer that is both UV-resistant and easy to process. This brings the scientists a significant step closer to industrial applications like flexible displays and photosensors.
Silicon nanosheets are thin, two-dimensional layers with exceptional optoelectronic properties very similar to those of graphene. Albeit, the nanosheets are...
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to simulate these confined natural conditions in artificial vesicles for the first time. As reported in the academic journal Small, the results are offering better insight into the development of nanoreactors and artificial organelles.
Enzymes behave differently in a test tube compared with the molecular scrum of a living cell. Chemists from the University of Basel have now been able to...
20.03.2017 | Event News
14.03.2017 | Event News
07.03.2017 | Event News
24.03.2017 | Materials Sciences
24.03.2017 | Physics and Astronomy
24.03.2017 | Physics and Astronomy