Abstract The activation of molecular oxygen with photoinduced charge carriers are highly vital in photocatalysis. Here, the synergetic effects of disordered surface layer and Ag–Pt nanoalloy over TiO2 nanosheet on the improved photocatalytic activity was proposed. The nanocomposites exhibited enhanced photocatalytic performance in selective oxidation of benzylamine to imine under UV–visible irradiation. More importantly, the synergetic effect of nanoalloy and surface oxygen vacancy boosted the generation of singlet oxygen in the selective oxidation of benzylamine. The regulation of thickness of disordered surface layer and composition of Ag–Pt nanoalloy over nanosheet TiO2 promoted the separation efficiency and mobility of charge carriers, resulted from the changed electronic structure of surface layer and nanoalloy. These findings provide an avenue for the design of nanocomposite photocatalysts combined defect engineering and nanoalloy modification to improve the photocatalytic activity.

中文翻译：

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Ag-Pt纳米合金与TiO2纳米片上的无序表面层相结合促进单线态氧的产生以提高光催化活性

摘要 光生载流子活化分子氧在光催化中非常重要。在这里，提出了无序表面层和 Ag-Pt 纳米合金在 TiO2 纳米片上的协同作用，以提高光催化活性。纳米复合材料在紫外-可见光照射下，在苄胺选择性氧化为亚胺方面表现出增强的光催化性能。更重要的是，纳米合金和表面氧空位的协同作用促进了苄胺选择性氧化中单线态氧的产生。由于表面层和纳米合金的电子结构发生变化，无序表面层的厚度和Ag-Pt纳米合金在纳米片TiO2上的组成促进了电荷载流子的分离效率和迁移率。