Insufficient photocatalytic NO oxidation capacity will lead to excessive toxic by-products (NO), which still seriously restrict its practical application. Herein, the multiple active sites (Cl, Bi and OVs) modified BiWO has been established by synthesis method. The synergistic effect of multiple active sites greatly increased the photo-electric properties of the BiWO, resulting in the boosting photocatalytic NO deep oxidation to nitrate. The visible light driven OVs-Bi@BWO-Cl catalyst exhibited a highest NO conversion efficiency (67.3 %) with extremely low NO concentration (17.9 ppb). The synergism of structural regulation from the OVs with Cl-doping and surface plasmon resonance of Bi significantly enhanced light absorption and provided a fast charge transport channel, improving the separation efficiency of photo-generated carriers. The DRIFTS and density functional theory (DFT) results shown that the synergistic effect by multiple active sites could enhance the adsorption and activation of reactants to accelerate the processes of HO/O-to-ROS and decrease the energy barrier of NO removal to promote deep oxidation of NO-to-NO. This work can provide ideas for the design and preparation of the catalyst for safe photocatalytic environment purification.

中文翻译：

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构建Bi2WO6的多个活性位点以实现高效光催化NO去除和NO2抑制


光催化NO氧化能力不足会导致有毒副产物（NO）过量，这仍然严重限制其实际应用。在此，通过合成方法建立了多个活性位点（Cl、Bi 和 OVs）修饰的 BiWO。多个活性位点的协同效应大大提高了BiWO的光电性能，从而促进光催化NO深度氧化成硝酸盐。可见光驱动的 OVs-Bi@BWO-Cl 催化剂表现出最高的 NO 转化效率 (67.3%) 和极低的 NO 浓度 (17.9 ppb)。 Cl掺杂的OVs与Bi的表面等离子体共振的结构调节协同作用显着增强了光吸收并提供了快速的电荷传输通道，提高了光生载流子的分离效率。 DRIFTS和密度泛函理论（DFT）结果表明，多个活性位点的协同效应可以增强反应物的吸附和活化，加速HO/O-to-ROS的过程，降低NO去除的能垒，促进深度反应。 NO-氧化为NO。该工作可为安全光催化环境净化催化剂的设计和制备提供思路。