Plasma-photocatalysis system (PPS) constructed by dielectric barrier discharge and TiO 2 photocatalysts could realize toluene oxidation removal at low temperatures, but requires further enhancement in the performance due to the relatively poor activity of TiO 2 . We herein report that co-loading Ag and CeO 2 on porous TiO 2 can construct a active Ag–CeO 2 /TiO 2 photocatalyst for the PPS, enabling the PPS to achieve promoted toluene conversion, CO 2 selectivity and stability in toluene oxidation removal. The Ag–CeO 2 /TiO 2 photocatalyst with porous microstructure and dispersed surface Ag particles can change the discharge mode, facilitating the interaction of plasma and photocatalysts in the PPS. We further disclose that the Ag/oxide interface can create highly active sites for surface oxidation reactions and enhances the separation of photoinduced electron-holes under the action of plasma. The intimate interaction between plasma and Ag–CeO 2 /TiO 2 photocatalyst and enhanced surface/photocatalytic oxidation reactions on Ag/oxide interface result in the promoted performance of toluene oxidation. The creation of highly active metal/oxide interface on porous TiO 2 photocatalyst may provide a strategy for the construction of high-efficiency PPS for VOCs removal.

中文翻译：

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通过构建具有高活性Ag/氧化物界面的多孔Ag-CeO2/TiO2光催化剂促进甲苯的等离子体光催化氧化

由介质阻挡放电和TiO 2 光催化剂构建的等离子体光催化系统（PPS）可以在低温下实现甲苯氧化去除，但由于TiO 2 的活性相对较差，需要进一步提高性能。我们在此报道，在多孔 TiO 2 上共负载 Ag 和 CeO 2 可以构建用于 PPS 的活性 Ag-CeO 2 /TiO 2 光催化剂，使 PPS 能够实现促进甲苯转化、CO 2 选择性和甲苯氧化去除稳定性。具有多孔微结构和分散的表面Ag颗粒的Ag-CeO 2 /TiO 2 光催化剂可以改变放电模式，促进PPS中等离子体和光催化剂的相互作用。我们进一步披露，Ag/氧化物界面可以为表面氧化反应创造高活性位点，并在等离子体的作用下增强光致电子空穴的分离。等离子体和Ag-CeO 2 /TiO 2 光催化剂之间的密切相互作用以及Ag/氧化物界面上增强的表面/光催化氧化反应导致甲苯氧化性能的提高。在多孔TiO 2 光催化剂上产生高活性金属/氧化物界面可能为构建用于VOCs去除的高效PPS提供策略。