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Issue 99, 2015
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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

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Abstract

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 N2 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 photo-induced 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.

Graphical abstract: 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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Supplementary files

Article information


Submitted
20 Jul 2015
Accepted
16 Sep 2015
First published
23 Sep 2015

RSC Adv., 2015,5, 81059-81068
Article type
Paper
Author version available

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

M. Sun, Q. Zhao, X. Liu, C. Du and Z. Liu, RSC Adv., 2015, 5, 81059
DOI: 10.1039/C5RA14336E

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