| Summary: | Here SnO<sub>2</sub>/LaFeO<sub>3−X</sub>N<sub>X</sub> 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<sub>2</sub> incorporated surface states and enhanced charge separation via coupling SnO<sub>2</sub>. Using the scavengers trapping experiments, the superoxide radical (O<sub>2</sub><sup>•−</sup>) was investigated as the major scavenger involved in the degradation of RhB over SnO<sub>2</sub>/LaFeO<sub>3−X</sub>N<sub>X</sub> composite. In this paper, the probable reaction steps involved in the RhB dye degradation over SnO<sub>2</sub>/LaFeO<sub>3−X</sub>N<sub>X</sub> composite are proposed. This work will provide reasonable strategies to fabricate LaFeO<sub>3</sub>-based proficient and stable catalysts for environmental purification. In addition, the result of the selectivity of gas performance is also presented.
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