Insight on photocatalytic oxidation of high concentration NO over BiOCl/ Bi2WO6 under visible light

다국어 초록 (Multilingual Abstract)

The exhaust gas from an SCR (Selective Catalytic Reduction) unit still has about 100 ppm NO. BiOX/Bi2WO6 catalysts were fabricated by a one-step ultrasound-assisted method and employed for photocatalyticoxidation of NO under visible light. The bandgap energy of BiOX (Cl, Br, I)/Bi2WO6 were estimatedto be 2.65 eV, 2.35 eV, and 1.75 eV, respectively. Photocurrent density and EIS curves revealed that BiOCl/Bi2WO6 had the optimal charge transfer velocity. Simulated NO removal experiments of BiOX/Bi2WO6catalysts were carried out in a fixed bed reactor, 20–30% NO (100 ppm inlet) removal rate was achievedunder visible light while promoting by H2O vapor, and the maximum NO removal rate is up to 31% onBiOCl/Bi2WO6. The fitted L-H model revealed that NO oxidation followed two-centered adsorption, andscavenger experiments confirm that the main ROS (Reactive Oxygen Species) was OH. In situ DRIFT spectrarevealed that there were bridging nitrates, monodentate and bridging nitrites, and other intermediatesformed on the BiOCl/Bi2WO6, these species can be scrubbed by seawater to regenerate thecatalyst. The NO photocatalytic oxidation pathway was proposed. Good activity and stability of BiOCl/Bi2WO6 provide a new approach for scale-up application of NO oxidation under visible light.

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