Issue 107, 2014

Advance ternary surface-fluorinated TiO2 nanosheet/Ag3PO4/Ag composite photocatalyst with planar heterojunction and island Ag electron capture center

Abstract

Morphology, phase structure and optical performance of ternary surface-fluorinated TiO2 nanosheet/Ag3PO4/Ag composite photocatalysts were characterized by field emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HRTEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectroscopy (DRS). Wide band-gap TiO2 crystal nanosheets were synthesized while stabilizing the {001} facet, which is highly active for oxidation reactions, with fluorination. Narrow band-gap Ag3PO4 crystal was then uniformly grown on a fluorinated-TiO2 nanosheet {001} facet, forming a planar heterojunction between two nanosheet semiconductors. Ag particles were in situ reduced by visible light irradiation from Ag3PO4, forming island-distributed Ag on the Ag3PO4 surface. TiO2/Ag3PO4/Ag exhibited excellent photocatalytic activity and high stability for methylene blue degradation under 410 nm LED light irradiation. The enhanced activities of TiO2/Ag3PO4/Ag could be attributed to effective electron–hole separation, fast hole transportation and the Schottky barrier. This novel ternary TiO2/Ag3PO4/Ag structure material is an ideal candidate in environmental treatment and cleaning applications.

Graphical abstract: Advance ternary surface-fluorinated TiO2 nanosheet/Ag3PO4/Ag composite photocatalyst with planar heterojunction and island Ag electron capture center

Article information

Article type
Paper
Submitted
19 Aug 2014
Accepted
05 Nov 2014
First published
05 Nov 2014

RSC Adv., 2014,4, 62751-62758

Advance ternary surface-fluorinated TiO2 nanosheet/Ag3PO4/Ag composite photocatalyst with planar heterojunction and island Ag electron capture center

K. Dai, L. Lu, C. Liang, G. Zhu and L. Geng, RSC Adv., 2014, 4, 62751 DOI: 10.1039/C4RA08899A

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