Jump to main content
Jump to site search


In-situ Epitaxial Growth of Ag3PO4 Quantum Dots on Hematite Nanotubes for High Photocatalytic Activities

Abstract

It is of great importance for the effective construction of semiconductor hetero-nanostructures (HNSs) with a well-defined hetero-interface. As so far the highly developed liquid-phase chemical routes are often restricted from the heavy using of surfactants or/and organic solvents, inevitably introducing passivated surface and interfacial defects in the resultant HNSs. Here we have develop a novel and efficient in-situ epitaxial growth strategy to fabricate the HNSs of Ag3PO4 quantum dots (QDs) on the external surface of hematite (Fe2O3) nanotubes (NTs) (Ag3PO4/Fe2O3), by intentionally employing the chemically adsorbed phosphate anions on the surface of Fe2O3 NTs to control the reaction kinetics of phosphate anions and Ag+ ions in an aqueous solution. Of this synthetic strategy, the chemically adsorbed phosphate anions on the surface of Fe2O3 NTs play dual functions for the heterogeneous nucleation and in-situ epitaxial growth of Ag3PO4 quantum dots (QDs) along the direction of (311) on the (113) crystal plane of Fe2O3 NTs, i.e., they precipitate Ag+ ions via gradual dissociation of free phosphate anions and generate Ag3PO4 QDs, and serve as a bridge and bond for in-situ epitaxial growth of Ag3PO4 QDs on Fe2O3 NTs. Due to the unique coupling hetero-interfaces and internal electric field, the as-obtained Ag3PO4/Fe2O3 HNSs show efficient separation of photogenerated charge carriers and remarkable enhancement of their reduction and oxidation abilities by a Z-scheme photocatalytic forms, significantly improved visible light photocatalytic activity for organic pollutant RhB decolorization. They exhibit a photocatalytic rate constant as large as 3.6×10-2 min-1, two orders of magnitude than that of single Fe2O3 NTs (9.1×10-4 min-1), single Ag3PO4 QDs (1.6×10-4 min-1) as well as the mixture of them (7.1×10-4 min-1), suggesting a highly efficient photocatalyst. The in-situ epitaxial growth strategy proposed here constitutes a novel example for the fine construction of hetero-nanostructures in the solar utilization.

Back to tab navigation

Supplementary files

Publication details

The article was received on 20 Jun 2019, accepted on 13 Aug 2019 and first published on 14 Aug 2019


Article type: Research Article
DOI: 10.1039/C9QI00744J
Inorg. Chem. Front., 2019, Accepted Manuscript

  •   Request permissions

    In-situ Epitaxial Growth of Ag3PO4 Quantum Dots on Hematite Nanotubes for High Photocatalytic Activities

    J. Duan, L. Xu, Y. Liu, B. Liu, T. Zhai and J. Guan, Inorg. Chem. Front., 2019, Accepted Manuscript , DOI: 10.1039/C9QI00744J

Search articles by author

Spotlight

Advertisements