NDLI: Charge separation by tetrahexahedron-SrTiO$_{3}$/TiO$_{2}$ heterojunction as an efficient photocatalyst

Content Provider	Springer Nature Link
Author	Afshar, Morteza Badiei, Alireza Eskandarloo, Hamed Mohammadi Ziarani, Ghodsi
Copyright Year	2016
Abstract	Charge separation plays a key role in the conversion of solar energy into chemical energy for use in the redox reaction and as well as in the photocatalytic activity. In this study, SrTiO$_{3}$ particles with different morphologies including irregular, tetrahexahedron, and cube were synthesized by an in situ solvothermal method. The photocatalytic activity of the synthesized nanoparticles was investigated in the photocatalytic decomposition of methylene blue under UV light irradiation. Tetrahexahedron SrTiO$_{3}$ particles exhibited high decomposition activity (70 %), which is about two times higher than those of the irregular and cubic SrTiO$_{3}$ particles. The high decomposition activity of tetrahexahedron SrTiO$_{3}$ particles could be attributed to the improvement of charge separation achieved on different crystal facets. To reach a good charge separation, tetrahexahedron SrTiO$_{3}$/TiO$_{2}$ coupled nanoparticles were fabricated by impregnation method. Results showed that coupling tetrahexahedron SrTiO$_{3}$ with TiO$_{2}$ could produce efficient charge separation between tetrahexahedron SrTiO$_{3}$ and TiO$_{2}$ due to their matched band edges. In order to achieve better charge separation, the tetrahexahedron SrTiO$_{3}$/90 %TiO$_{2}$ sample was calcined at different temperatures in the 450–750 °C range. Tetrahexahedron SrTiO$_{3}$/90 %TiO$_{2}$ coupled nanoparticles calcined at 650 °C show high photocatalytic activity compared with other samples. The prepared samples were characterized by using various techniques such as X-ray diffraction, scanning electron microscopy, photoluminescence emission spectra, and UV–Vis diffuse reflectance spectroscopy.
Starting Page	7269
Ending Page	7284
Page Count	16
File Format	PDF
ISSN	09226168
Journal	Research on Chemical Intermediates
Volume Number	42
Issue Number	10
e-ISSN	15685675
Language	English
Publisher	Springer Netherlands
Publisher Date	2016-04-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Charge separation In situ solvothermal Tetrahexahedron SrTiO$_{3}$/TiO$_{2}$ Photocatalytic activity Catalysis Physical Chemistry Inorganic Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry

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