Construction of CeO2/δ-MnO2 heterojunction for photothermal catalysis of toluene

Energy-efficient catalysis technology is highly desired for the emission reduction of volatile organic compounds (VOCs). Photothermal catalytic oxidation holds promise for the intention. Herein, we reported a photothermal catalyst ${\mathrm{CeO}}_2/\delta \text{-}{\mathrm{MnO}}_2$ with heterojunction for catalytic oxidizing toluene with high efficiency through the hydrothermal method. A 90% conversion rate for 200 ppm toluene over the catalyst could be achieved at 118 °C under the gas hourly space velocity of 36,000 $\mathrm{mL}$/ (g h) with the irradiation of 350 ${\mathrm{mW/cm}}^2$ visible light. The excellent performance can be largely related to the construction of heterojunctions between ${\mathrm{CeO}}_2$ and $\delta \text{-}{\mathrm{MnO}}_2$. This study may provide an energy-efficient way for catalytic degradation of VOCs and insight into rational design for photothermal catalysts.