Titanium dioxide encapsulation of supported Ag nanoparticles on the porous silica bead for increased photocatalytic activity
•A novel Ag-loading and TiO2-coating technique was used to prepare samples.•The photocatalytic activity of the product was evaluated by removing of Rh B.•The as-synthesized samples showed an excellent photocatalytic activity. A new synthetic strategy has been developed to encapsulate Ag nanoparticle...
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| Published in: | Applied surface science 2015-01, Vol.326, p.82-90 |
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| Main Authors: | , , , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | •A novel Ag-loading and TiO2-coating technique was used to prepare samples.•The photocatalytic activity of the product was evaluated by removing of Rh B.•The as-synthesized samples showed an excellent photocatalytic activity.
A new synthetic strategy has been developed to encapsulate Ag nanoparticles in heterogeneous catalysts to prevent their dropping and sintering. Ag nanoparticles with diameters about 5–10nm were first supported on the porous silica bead. These were then covered with a fresh layer of titanium dioxide with the thickness about 5nm. SEM and TEM images were used to confirm the success of each synthesis step, and the photocatalytic activity of the as-synthesized samples was evaluated by photocatalytic decolorization of Rhodamine B (Rh B) aqueous solution at ambient temperature under both UV and visible light irradiation. The resulting titanium dioxide encapsulated Ag nanoparticles exhibited an enhanced photocatalytic activity under both UV and visible light irradiation, this can be attributed to effective charge separation and light harvesting of the plasmonic silver nanoparticles decoration, even the reducing of the exciton recombination rate caused by the small grain size of anatase TiO2 nanocrystals. |
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| ISSN: | 0169-4332 1873-5584 |