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 photocatalytic oxidation of NO under visible light. The bandgap energy of BiOX (Cl, Br, I)/Bi₂WO₆ were estimated to 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/Bi₂WO₆ catalysts were carried out in a fixed bed reactor, 20–30% NO (100 ppm inlet) removal rate was achieved under visible light while promoting by H₂O vapor, and the maximum NO removal rate is up to 31% on BiOCl/Bi₂WO₆. The fitted L-H model revealed that NO oxidation followed two-centered adsorption, and scavenger experiments confirm that the main ROS (Reactive Oxygen Species) was •OH. In situ DRIFT spectra revealed that there were bridging nitrates, monodentate and bridging nitrites, and other intermediates formed on the BiOCl/Bi₂WO₆, these species can be scrubbed by seawater to regenerate the catalyst. 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.

来自 SCR（选择性催化还原）装置的废气仍含有约 100 ppm NO。BiOX/Bi ₂ WO ₆催化剂是通过一步超声辅助方法制备的，用于在可见光下光催化氧化NO。BiOX (Cl, Br, I)/Bi ₂ WO ₆的带隙能量估计分别为2.65 eV、2.35 eV和1.75 eV。光电流密度和EIS曲线表明BiOCl/Bi ₂ WO ₆具有最佳的电荷转移速度。BiOX/Bi ₂ WO _{6 的}模拟 NO 去除实验催化剂在固定床反应器中进行，在可见光下，在 H ₂ O 蒸汽促进下，NO 去除率达到20-30%（入口 100 ppm），BiOCl/Bi 上 NO 去除率最高可达 31% ₂ WO ₆．拟合的 LH 模型显示 NO 氧化遵循双中心吸附，清除剂实验证实主要的 ROS（活性氧物种）是 •OH。原位DRIFT 光谱显示在 BiOCl/Bi ₂ WO ₆上形成了桥连硝酸盐、单齿和桥连亚硝酸盐以及其他中间体，这些物质可以通过海水洗涤以再生催化剂。提出了NO光催化氧化途径。BiOCl/Bi ₂ WO ₆良好的活性和稳定性为可见光下NO氧化的放大应用提供了新途径。