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  • Title: Assembly of surface-defect single-crystalline strontium titanate nanocubes acting as molecular bricks onto surface-defect single-crystalline titanium dioxide (B) nanorods for efficient visible-light-driven photocatalytic performance.
    Author: Kuang J, Xing Z, Yin J, Li Z, Zhu Q, Zhou W.
    Journal: J Colloid Interface Sci; 2019 Mar 01; 537():441-449. PubMed ID: 30469113.
    Abstract:
    Ti3+ self-doped single-crystalline SrTiO3-x nanocubes acting as molecular bricks are successfully assembled onto Ti3+ self-doping single-crystalline TiO2-x(B) nanorods through an effortless two-step hydrothermal process coupled with an in situ solid-state chemical reduction method. SrTiO3-x nanocubes act as molecular bricks, which are uniformly assembled onto the surface of TiO2-x(B) nanorods due to lattice matching. The band gap of the resultant SrTiO3-x/TiO2-x(B) sample is ∼2.97 eV, which exhibits excellent photocatalytic performance for the reduction of Cr(VI) and hydrogen production under visible light. The apparent rate constant k value for the photocatalytic reaction of SrTiO3-x/TiO2-x(B) for Cr(VI) reduction is ∼8 times higher than that of white TiO2(B). The photocatalytic hydrogen production rate for SrTiO3-x/TiO2-x(B) is ∼160.2 μmol g-1 h-1, which is ∼5 times higher than that of white TiO2(B). The enhanced photocatalytic activity can be considered to be caused by a synergetic effect of heterojunction formation and the introduction of Ti3+ self-doping, which can not only facilitate the separation of photogenerated charge carriers between TiO2-x(B) and SrTiO3-x, but also broaden the photoresponse from the UV to visible-light region.
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