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Ultrafast Synthesis of Titanium Suboxide via Magnetic Induction Heating for Enhanced Photodynamic Activity
John Tressel1, Alex Nguyen1, Phat Nguyen1
1Department of Chemistry and Biochemistry, University of California, Santa Cruz, California, USA.
Abstract:
Magnéli-phase titanium suboxides (TinO2n-1) have become a focal point of photocatalytic research due to a reduced band gap and enhanced visible light absorption, as compared to traditional TiO2. Herein, P25 TiO2 is converted to mixed-phase TinO2n-1 via ultrafast chemical reduction with sodium borohydride using magnetic induction heating (MIH) at controlled currents for 12 s. The obtained samples exhibit an increasing fraction of Ti2O3 with the MIH current, from 26% at 200 A to 69% at 600 A. Among the series, the sample prepared at 600 A shows the best photocatalytic activity for water purification as manifested in the degradation of organic dyes (methylene blue) and removal of waterborne pathogenic bacteria (Escherichia coli), due to the photocatalytic reduction of oxygen to hydroxyl radicals. Results from this study highlight the unique potential of MIH in the ultrafast reduction of metal oxides into multiphase heterostructures and their application as high-performance catalysts.
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