Synergic effects of CuxO electron transfer co-catalyst and valence band edge control over TiO2 for efficient visible-light photocatalysis

doi:10.1016/S1872-2067(17)62959-0

Abstract

Abstract:

Bandgap engineering by doping and co-catalyst loading are two primary approaches to designing efficient photocatalysts by promoting visible-light absorption and charge separation, respectively. Shifting of the TiO₂ conduction band edge is frequently applied to increase visible-light absorption but also lowers the reductive properties of photo-excited electrons. Herein, we report a visible-light-driven photocatalyst based on valance band edge control induced by oxygen excess defects and modification with a Cu_xO electron transfer co-catalyst. The Cu_xO grafted oxygen-rich TiO₂ microspheres were prepared by ultrasonic spray pyrolysis of the peroxotitanate precursor followed by a wet chemical impregnated treatment. We found that oxygen excess defects in TiO₂ shifted the valence band maximum upward and improved the visible-light absorption. The Cu_xO grafted onto the surface acted as a co-catalyst that efficiently reduced oxygen molecules to active intermediates (i.e., O₂^·-radial and H₂O₂), thus consuming the photo-generated electrons. Consequently, the Cu_xO grafted oxygen-rich TiO₂ microspheres achieved a photocatalytic activity respectively 8.6, 13.0 and 11.0 as times high as those of oxygen-rich TiO₂, normal TiO₂ and Cu_xO grafted TiO₂, for degradation of gaseous acetaldehyde under visible-light irradiation. Our results suggest that high visible-light photocatalytic efficiency can be achieved by combining oxygen excess defects to improve visible-light absorption together with a Cu_xO electron transfer co-catalyst. These findings provide a new approach to developing efficient heterojunction photocatalysts.

Key words: Visible light photocatalysis, TiO₂, Cu_xO cocatalyst, Oxygen-excess defect, Porous microsphere

Lina Kong, Xintong Zhang, Changhua Wang, Fangxu Wan, Lan Li. Synergic effects of Cu_xO electron transfer co-catalyst and valence band edge control over TiO₂ for efficient visible-light photocatalysis[J]. Chinese Journal of Catalysis, 2017, 38(12): 2120-2131.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(17)62959-0

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Synergic effects of Cu_xO electron transfer co-catalyst and valence band edge control over TiO₂ for efficient visible-light photocatalysis

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