Construction of fiber-shaped silver oxide/tantalum nitride p-n heterojunctions as highly efficient visible-light-driven photocatalysts.

Author(s) Li, S.; Hu, S.; Xu, K.; Jiang, W.; Liu, Y.; Leng, Z.; Liu, J.
Journal J Colloid Interface Sci
Date Published 2017 Oct 15
Abstract

Constructing novel and efficient p-n heterojunction photocatalysts has stimulated great interest. Herein, we report the design and synthesis of fiber-shaped Ag2O/Ta3N5p-n heterojunctions as a kind of efficient photocatalysts. Ta3N5 nanofibers were prepared by an electrospinning-calcination-nitridation method, and then the in-situ anchoring of Ag2O on their surfaces was realized by a facile deposition method. The resulting Ag2O/Ta3N5 heterojunctions were comprised of porous Ta3N5 nanofibers (diameter: ∼150nm) and Ag2O nanoparticles (size: ∼12nm). The photocatalytic activity of these heterojunctions were studied by decomposing rhodamine B (RhB) dye and tetracycline (TC) antibiotic under visible light (λ>400nm). In all the samples, the heterojunction with Ag2O/Ta3N5 molar ratio of 0.2/1 displays the best activity. It is found that a synergistic effect contributes to the effective suppression of charges recombination between Ta3N5 and Ag2O, leading to an enhanced photocatalytic activity with good stability. The photogenerated holes (h(+)) and superoxide radicals (O2(-)) play dominant roles in the photocatalytic process. These p-n heterojunctions will have great potential for environmental remediation because of the facile preparation process and exceptional photocatalytic activity.

DOI 10.1016/j.jcis.2017.06.018
ISSN 1095-7103
Citation Li S, Hu S, Xu K, Jiang W, Liu Y, Leng Z, et al. Construction of fiber-shaped silver oxide/tantalum nitride p-n heterojunctions as highly efficient visible-light-driven photocatalysts. J Colloid Interface Sci. 2017;504:561-569.

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