422417 Highly Porous Ti4O7 Reactive Electrode Membranes for Water Filtration

Wednesday, November 11, 2015: 3:20 PM
155F (Salt Palace Convention Center)
Melissa Santos1, Yin Jing2, Lei Fang2,3, Brian Chaplin2 and Yossef A. Elabd1, (1)Artie McFerrin Department of Chemical Engineering, Texas A&M University, College Station, TX, (2)Chemical Engineering, University of Illinois at Chicago, Chicago, IL, (3)College of Civil Engineering and Architecture, Zhejiang University, Hangzhou, China

Previous work has demonstrated the effectiveness of Ti4O7 ceramic reactive electrochemical membranes (REMs) for contaminant oxidation and fouling prevention during water filtration, where contaminants/foulants are destroyed via electrochemical anodic oxidation at the surface of the membrane. However, these studies used low-porosity rigid ceramic REMs with limited configurations. To expand the potential applications of Ti4O7 REMS, in this study, highly porous and flexible REMs were fabricated via a simultaneous electrospinning/electrospraying (E/E) technique. The resulting membranes from this method produced a network of poly(sulfone) (PSU) nanofibers and Ti4O7 particles with intimate contact between both materials throughout the porous matrix, where changing the various electrospinning and electrospraying parameters and solution properties allows for membranes with various porosities, fiber sizes, and particle sizes. To date, few studies have explored the E/E method to develop membranes for water purification and to our knowledge previous studies have not utilized the E/E method to develop REMs. Characterization of the E/E REMs was performed using X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermal gravimetric analysis (TGA). The electrochemical properties and water filtration performance of these E/E REMs were evaluated using electrical impedance spectroscopy (EIS), cyclic voltammetry (CV), and membrane filtration studies. Filtration results demonstrate that E/E REMs exhibited a significantly higher water flux than previously investigated rigid REMs along with an order of magnitude higher contaminant removal rate.

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See more of this Session: Membranes for Water Treatment Applications III
See more of this Group/Topical: Separations Division