Synergistic Effect of Reactive Oxygen Species in Photothermocatalytic Removal of VOCs from Cooking Oil Fumes over Pt/CeO₂/TiO₂

Abstract

The volatile organic compounds (VOCs) from cooking oil fumes are very complex and do harm to humans and the environment. Herein, we develop the high-efficiency and energy-saving synergistic photothermocatalytic oxidation approach to eliminate the mixture of heptane and hexanal, the representative VOCs with high concentrations in cooking oil fumes. The Pt/ CeO 2 /TiO 2 catalyst with nanosized Pt particles was prepared by the simple hydrothermal and impregnation methods, and the physicochemical properties of the catalyst were measured using numerous techniques. The Pt/CeO 2 /TiO 2 catalyst eliminated the VOC mixture at low light intensity (100 mW cm −2 ) and low temperature (200 °C). In addition, it showed 25 h of catalytic stability and water resistance (water concentration up to 20 vol %) at 140 or 190 °C. It is concluded that O 2 picked up the electrons from Pt to generate the • O 2 − species, which were transformed to the O 2 2− and O − species after the rise in temperature. In the presence of water, the • OH species induced by light irradiation on the catalyst surface and the • OOH species formed via the thermal reaction were both supplementary oxygen species for VOC oxidation. The synergistic interaction of photo-and thermocatalysis was generated by the reactive oxygen species.

Review and Perspectives of Enhancement in the Catalytic Stability for the Complete Combustion of CO, CH4, and Volatile Organic Compounds

“…(1) Compared with the catalytic oxidation technique, a combined technique, such as the adsorption–catalytic oxidation method, could improve the catalytic removal efficiency and reduce the energy consumption. Hence, the development of bifunctional materials for the capture and destruction of CO, CH 4 , and VOCs is an interesting direction. , (2) Synergistic photothermocatalytic oxidation, meaning that thermocatalysis is assisted by renewable solar energy resources, has become a research hotspot due to its high elimination efficiency and low energy consumption, while the synergistic effect between photocatalysis and thermocatalysis on the catalytic activity and stability need further study. − (3) The emissions usually contain various pollutants. There are both polychlorinated dibenzofurans (PCDD/Fs) and NO x in the emissions of municipal solid waste incineration and iron ore sintering industry.…”

In Situ Construction of Manganese Oxide Photothermocatalysts for the Deep Removal of Toluene by Highly Utilizing Sunlight Energy

“…Photothermocatalysts applied in VOC removal are mainly developed based on thermal catalysts, including noble metal-based catalysts and transition-metal oxide catalysts. Photothermal catalytic oxidation of VOCs has been verified on a variety of catalysts, such as TiO 2 /CeO 2 , MnO x /TiO 2 , CeMn x O y /TiO 2 , Pt/CuO–CeO 2 , and Pt/CeO 2 /TiO 2 , as a catalytic process where the comprehensive effects of photocatalysis and thermocatalysis work together to promote the catalytic reaction. Our previous work has also proved that light not only acts as a heat source but also activates more lattice oxygen to participate in the reaction, while photocatalysis plays an auxiliary role. , …”

Recent Progress in Metal Oxide-Based Photocatalysts for CO2 Reduction to Solar Fuels: A Review

“…In summary, CeO 2 is a rare-earth metal oxide with a good photochemical stability, low cost and environment friendly characteristics. It is an important n-type semiconductor with a wide bandgap, and credible photocatalysts have been designed to reduce CO 2 and degrade pollutants [ 126 ].…”