Abstract Visible-light-responsive semiconductor decorated with bi-metal nanoparticles synergistic photocatalysts are promising in photocatalysis. Herein, bi-metal nanoparticles Au-Pd decorated ZnIn2S4 nanosheets photocatalytic system was constructed and applied in reaction of photocatalytic selective oxidation of of aromatic alcohols. Various parameters including loading ratio of two metal, loading amount, solvents, time, reactant were investigated. The optimal 0.5 wt% Au-Pd/ZnIn2S4 photocatalysts was founded to exhibit the highest photocatalytic activity, which is 1.5, 2.0 and 1.3 times higher than pristine ZnIn2S4, Au/ZnIn2S4 and Pd/ZnIn2S4, respectively. Characterization results confirmed enhanced visible-light harvesting capability as well as superior photoinduced carriers’s separation and transfer behavior, enhanced O2 adsorption and reduction ability of Pd and surface reaction kinetics account for enhanced photocatalytic activity, in addition, which ascribed to dual metal synergistic effect and metal-semiconductor interaction in Au-Pd/ZnIn2S4 system. Finally, the corresponding reactive radical species was confirmed by ESR and other method. Based on the experimental data and analysis, possible reaction mechanism is proposed. The photogenerated h+, O2− and carbon centered radicals are responsible for the reaction. This systemic work shed light on the bi-metal decorated semiconductor photocatalyst, where metal-metal interaction as well as metal-semiconductor cooperated together to improve the performance of catalysts in visible-light-driven organic transformations.

中文翻译：

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Au-Pd/ZnIn2S4双界面协同促进芳香醇光催化选择性氧化

摘要 用双金属纳米粒子协同光催化剂修饰的可见光响应半导体在光催化领域具有广阔的应用前景。在此，构建了双金属纳米粒子 Au-Pd 修饰的 ZnIn2S4 纳米片光催化体系，并将其应用于芳醇的光催化选择性氧化反应。研究了多种参数，包括两种金属的负载比、负载量、溶剂、时间、反应物。发现最佳的 0.5 wt% Au-Pd/ZnIn2S4 光催化剂表现出最高的光催化活性，分别是原始 ZnIn2S4、Au/ZnIn2S4 和 Pd/ZnIn2S4 的 1.5、2.0 和 1.3 倍。表征结果证实增强的可见光捕获能力以及优异的光致载流子分离和转移行为，此外，Pd 和表面反应动力学增强的 O2 吸附和还原能力导致光催化活性增强，此外，这归因于 Au-Pd/ZnIn2S4 体系中的双金属协同效应和金属-半导体相互作用。最后，通过ESR等方法确认了相应的活性自由基种类。根据实验数据和分析，提出了可能的反应机理。光生 h+、O2- 和碳中心自由基负责反应。这项系统性工作揭示了双金属装饰的半导体光催化剂，其中金属-金属相互作用以及金属-半导体共同协作以提高催化剂在可见光驱动的有机转化中的性能。