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首页> 外文期刊>RSC Advances >Comparative study on sandwich-structured SiO2@Ag@SnO2 and inverse SiO2@SnO2@Ag: key roles of shell ordering and interfacial contact in modulating the photocatalytic properties
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Comparative study on sandwich-structured SiO2@Ag@SnO2 and inverse SiO2@SnO2@Ag: key roles of shell ordering and interfacial contact in modulating the photocatalytic properties

机译：夹层结构SiO2 @ Ag @ SnO2和反SiO2 @ SnO2 @ Ag的比较研究：壳有序和界面接触在调节光催化性能中的关键作用

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摘要

Sandwich-structured SiO2@Ag@SnO2 and inverse SiO2@SnO2@Ag using SiO2 spheres as cores have been systematically synthesized through hydrothermal treatment. The crystal structure, morphology, size, composition and specific surface area of products were investigated by XRD, SEM, TEM (HRTEM), XPS, UV-vis and N-2 adsorption-desorption instruments. It was found that both Ag nanoparticles and SnO2 layers were successfully decorated or coated on the surface of the matrix. The investigation of photocatalytic properties indicated that the SiO2@Ag@SnO2 heterostructure possessed an excellent photocatalytic ability superior to the SiO2@Ag, SiO2@SnO2 and even the inverse sample SiO2@SnO2@Ag, for the degradation of Rhodamine B (RhB) driven by UV light. The results indicated that Ag nanoparticles acted as the trapping centers for photo-induced electrons, and thus promoted the separation of photoinduced electron-hole pairs and charge migration. The enhanced photocatalytic ability of the heterostructure SiO2@Ag@SnO2 compared to the inverse sample SiO2@SnO2@Ag was possibly due to the larger exposed surface area under UV light irradiation, larger contact interfacial area and larger specific surface area of SiO2@Ag@SnO2 than SiO2@SnO2@Ag. Furthermore, the photocatalyst SiO2@Ag@SnO2 displayed benign recyclability in that its photocatalytic activity was still preserved after 5 cycles.
机译：通过水热处理系统地合成了以SiO2球为核的三明治结构的SiO2 @ Ag @ SnO2和反SiO2 @ SnO2 @ Ag。用XRD，SEM，TEM（HRTEM），XPS，UV-vis和N-2吸附-脱附仪研究了产品的晶体结构，形态，尺寸，组成和比表面积。发现Ag纳米颗粒和SnO 2层都成功地装饰或涂覆在基质表面上。对光催化性能的研究表明，SiO2 @ Ag @ SnO2的异质结构具有优异的光催化能力，该性能优于SiO2 @ Ag，SiO2 @ SnO2甚至是反向样品SiO2 @ SnO2 @ Ag，对罗丹明B（RhB）驱动的降解通过紫外线。结果表明，Ag纳米粒子充当了光致电子的俘获中心，从而促进了光致电子-空穴对的分离和电荷迁移。与反相样品SiO2 @ SnO2 @ Ag相比，异质结构SiO2 @ Ag @ SnO2的增强的光催化能力可能是由于紫外线照射下的暴露表面积较大，接触界面面积较大和SiO2 @ Ag @的比表面积较大SnO2比SiO2 @ SnO2 @ Ag。此外，光催化剂SiO2 @ Ag @ SnO2具有良好的可回收性，因为在5个循环后仍保持了其光催化活性。

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