Exceptional tribo-catalytic degradation of concentrated methyl orange and methylene blue solutions by DXN-RT30 TiO2 nanoparticles

As tribo-catalysis gains increasing attention to harness mechanical energy for environmental remediation, it is time to explore its application to those organic pollutants that have been challenging to degrade. In this study, four commercial metal oxide nanoparticles , BaTiO 3 , ZnO, P25 TiO 2 , and DXN-RT30 TiO 2 nanoparticles, were stimulated through magnetic stirring to degrade 20 mg/L methyl orange (MO) and 30 mg/L methylene blue (MB) solutions. While all the other nanoparticles showed rather poor performance, DXN-RT30 TiO 2 nanoparticles performed exceptionally well: With Teflon magnetic disks rotating at 400 rpm, 98.2% of MO and 100% of MB were degraded within 330 and 420 min, respectively. DXN-RT30 TiO 2 nanoparticles demonstrated a unique absorption for MB molecules, yielding significantly different outcomes in active species trapping experiments between degradation of MO and MB solutions by DXN-RT30 TiO 2 . Complemented by electron paramagnetic resonance analysis, our findings suggest that for DXN-RT30 TiO 2 nanoparticles under magnetic stirring, MO molecules are degraded by h + , ·OH, and e − in solution, while MB molecules are absorbed and degraded via h + and e − on the surface of DXN-RT30 TiO 2 nanoparticles. This study identifies DXN-RT30 TiO 2 nanoparticles as a cost-effective, high-performance, and environmentally friendly tribo-catalyst for environmental remediation, stimulating further exploration for more excellent tribo-catalysts.