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Application of Green Technology to Fibrous Separation Membranes for Water Purification

 
Speaker: Prof. Benjamin Chu, Stony Brook University
Date: Monday, 26th October 2015
Time: 10:00 AM
Venue: Central Cconference Room,Yifu Conference Centrefor academic report
Abstract: The fabrication of fibrous separation membranes can be accomplished by using a variety of fibers of different fiber cross-sections, ranging from tens of microns to a few nanometers. The process includes melt-blowing, electro-spinning and a combination of chemical/mechanical means to isolate microfibrils from bulk polysaccharides, e.g., bacterial cellulose or cellulose from natural resources, such as plants. The ultra-thin cellulose nanofibers have been isolated by using a variety of methods. Among them, the combined TEMPO oxidation/mechanical treatment has been a very successful way to fabricate nanofibers with cross-sections of a few nanometers and a high degree of crystallinity. Non-woven nanofibrous scaffolds have unique properties, including interconnected pores, a very large surface-to-volume ratio, and a high capacity for surface modifications. The hierarchical fibrous structure with fibers of different cross-sections, together with the use of directed water channels in the barrier layer and surface functionalization, permits us to fabricate high throughput separation media. In this presentation, we discuss the fabrication and characterization of those nanofibers and their applications to micro-, ultra-, and nano-filtration.
Keywords: electrospinning, cellulose nanofibers, membranes, water purificzation
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