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Abstract
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Strontium titanate (SrTiO3) with wide band gap, is only active under UV light irradiation and not
under visible light. On the other hand, occupies about 3-5% of the solar spectrum falls in the UV
range. Hence, modification of SrTiO3 is necessary to improvement of the photocatalytic activity
of it. In this work, coupling of SrTiO3 (STO) on reduced Graphene Oxide (rGO) was studied for
its enhanced photocatalytic activity under visible light irradiation. The enhanced activity can be
partially attributed to the transfer of photoexcited electrons and holes in the STO/rGO
semiconductor. Understanding the rGO/semiconductor interaction is of key importance for the
design and synthesis of next generation photocatalytic materials for efficient photocatalytic
activity and environmental clean-up applications. Hence, the separation mechanisms of
photogenerated electrons and holes for STO/rGO semiconductor have been a research focus. Based
on the experiment results, a possible mechanism of the photocatalysis over STO/rGO were
investigated by photoluminescence technique (PL) and DRS analysis. Determining free radical
ways in the presence of appropriate scavengers of oxidation to fit the experimental results was also
further discussed. In this mechanism, the rGO acts as photosensitizer for wide band gap of STO
semiconductor which can be photoexcited for generating electron and hole pairs.
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