Facile Synthesis of SnO2/LaFeO3-XNX Composite: Photocatalytic Activity and Gas Sensing Performance

Here SnO2/LaFeO3-XNX composite was fabricated using a wet chemical method and was applied to pollutants degradation and gas sensing for the first time. The composite exhibits high performance for photocatalytic degradation of Rhodamine B (RhB) dye and selectivity sensing of various gases. On the basis of the completed experiments, the improved RhB degradation and selective gas sensing performance resulted from the extended optical absorption via N-2 incorporated surface states and enhanced charge separation via coupling SnO2. Using the scavengers trapping experiments, the superoxide radical (O-2(center dot-)) was investigated as the major scavenger involved in the degradation of RhB over SnO2/LaFeO3-XNX composite. In this paper, the probable reaction steps involved in the RhB dye degradation over SnO2/LaFeO3-XNX composite are proposed. This work will provide reasonable strategies to fabricate LaFeO3-based proficient and stable catalysts for environmental purification. In addition, the result of the selectivity of gas performance is also presented.