The CREWS-JRW team will meet on Tuesday, May 18, at 12 p.m.
Shelton Varapragasam, a postdoctoral researcher in the Grumstrup Lab at Montana State University, will give a presentation on "Photocatalytic reduction of aqueous nitrate with hybrid Ag/g-C3N4 under UV and visible light."
In this work, photocatalytic nitrate reduction (PNR) was explored using hybrid Ag/g-C3N4 as a photocatalyst at neutral pH. Nitrate is reduced to various forms through photocatalytically evolved hydrogen adsorbed on silver metal nanoparticles incorporated into a g-C3N4 matrix. Upon varying the percentage of metal loading onto the g-C3N4 the population of supported silver metal domains can be adjusted. By varying the density of the Ag metal domains onto the g-C3N4 semiconductor, the reduction selectivity of nitrate could be tuned. As-synthesized Ag/g-C3N4 exhibited PNR under both UV and visible light irradiation.
Bio: Shelton Varapragasam graduated from the Vavuniya Campus of the University of Jaffna, Sri Lanka with a B.S. in Environmental Science. Then he earned his M.S. in Geo-Informatics from the University of Peradeniya, Sri Lanka. Later, he moved to the U.S. to pursue his Ph.D. in Materials Chemistry. He obtained M.S. in Chemistry and Ph.D. in Materials Chemistry from the University of South Dakota. During his stay at USD, he worked under Dr. James Hoefelmeyer, where he learned nanoscale engineering techniques of semiconductor materials and photocatalysis. Currently, he is working as Post-Doctoral Research Scientist under Dr. Erik Grumstrup for the Department of Chemistry and Biochemistry of Montana State University. As a research scientist, he is designing a hybrid photocatalyst and conducting photocatalytic nitrate reduction studies of the engineered photocatalyst.