Facile Synthesis of SnO 2 /LaFeO 3?X N X Composite: Photocatalytic Activity and Gas Sensing Performance

摘要

Here SnO 2 /LaFeO 3?X N X 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 SnO 2 . Using the scavengers trapping experiments, the superoxide radical (O 2 ?? ) was investigated as the major scavenger involved in the degradation of RhB over SnO 2 /LaFeO 3?X N X composite. In this paper, the probable reaction steps involved in the RhB dye degradation over SnO 2 /LaFeO 3?X N X composite are proposed. This work will provide reasonable strategies to fabricate LaFeO 3 -based proficient and stable catalysts for environmental purification. In addition, the result of the selectivity of gas performance is also presented.