Abstract
The coupling of solar energy conversion and catalytic ozonation is an effective way to eliminate volatile organic compounds with high-efficiency and low-energy-consumption. In this work, we presented a non-noble-metal SiC/CeO2 system for solar-light-assisted catalytic ozonation of toluene. Temperature and light-controlled experiments and atmosphere surface photovoltage measurement were conducted to evaluate photothermal and photoelectric processes. Results show that toluene removal and mineralization efficiencies of 25%SiC-CeO2 were 69.7% and 67.1%, respectively, under full-spectrum illumination with an hourly space velocity of 6000 /h. The SiC enhanced the conversion of incident visible and infrared (IR) light to heat, thereby increasing the reaction temperature over 25%SiC-CeO2- Moreover, SiC transferred electrons to CeO2 in 25%SiC-CeO2, generating more surface Ce~(3+) sites and promoting charge carriers separation efficiency. Given these characteristics, 25%SiC-CeO2 exhibited outstanding performance in toluene mineralization, even better than Pd-loaded CeO2.
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