The photocatalysis and mechanism of new SrTiO3/TiO2

• The preparation method and the optimal ration of SrTiO3/TiO2 have been confirmed.
• The comprehensive characterizations and photocatalysis of SrTiO3/TiO2 have been tested.
• Much better properties of electron-transfer and free-radical generation are confirmed as the direct cause.
• The diagrammatic sketch of photo-excitation has been given accordingly.

The SrTiO3/TiO2 was obtained via hydrothermal and sol–gel method and the optimal proportion (5wt %) was confirmed. The compounds have been characterized by XRD, UV–vis DRS, TEM and XPS. The photocatalytic degradation toward gas-phase benzene is almost 40% under UV irradiation, much better than pure TiO2 and SrTiO3. Besides, the SrTiO3/TiO2 also possessed outstanding performance toward methyl orange in liquid-phase testing. Finally, the electro-chemistry and electron spin-resonance spectroscopy (ESR) provided evidence that the improved photocatalysis is attributed to (1) the matching energy band which can transfer charge carriers efficiently and (2) enhanced generation of photo-electron and free radicals.

The SrTiO3/TiO2 was obtained via hydrothermal and sol–gel method. The improved photocatalysis is attributed to (1) the matching energy band which can transfer charge carriers efficiently and (2) enhanced generation of photo-electron and free radicals.Figure optionsDownload as PowerPoint slide