ScholarWorks@숙명여자대학교

초록

SnO2 nanoparticles (NPs) exhibit a photocatalytic activity under UV light. However, their limited response to visible light restricts their applications, highlighting the need for new methodologies. We demonstrate Ir-doping to SnO2 only show a slight increase to visible light response and photocatalytic activity. However, treating the Ir-doped SnO2 with NaBH4 calcination dramatically improves the visible light response and photocatalytic activity. The additional NaBH4-assisted calcination further increased the O-V density and narrowed the bandgap of Ir ion-doped SnO2 NPs, enabling visible-light-driven photocatalytic oxidation of 5-hydroxymethylfurfural and toluene. This study provides a novel approach to optimize the defect engineering of SnO2-based catalysts through Ir doping and NaBH4 calcination. The resulting increase in O-V density and band structure modification were well demonstrated by spectroscopic analyses and DFT calculations. The optimized catalyst exhibited outstanding performance under visible light irradiation, achieving >90 % HMF and > 75 % toluene photoconversion into 2,5-furandicarboxylic acid and benzaldehyde, respectively, while maintaining excellent recyclability. These findings advance the development of multifunctional catalysts and are expected to inspire the design of next-generation catalysts for sustainable biomass transformation.

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