Shape-dependent enhanced photocatalytic effect under visible light of Ag3PO4 particles

Julia Zwara , Ewelina Grabowska , Tomasz Klimczuk , Wojciech Lisowski , Adriana Zaleska-Medynska

Abstract

Silver phosphate (Ag3PO4) could be considered as visible light induced photocatalyst for pollutants degradation, due to its narrow band gap (∼2.4 eV). However, Ag3PO4 photoactivity depends on surface properties and synthesis route. In this study, differently shaped Ag3PO4 photocatalysts have been synthesized through the precipitation, ion exchange, soft-chemical or hydrothermal method. To correlate surface properties with photoactivity all samples were characterized towards morphology, crystal structure, specific surface area, optical properties, chemical composition and activity in phenol degradation upon visible light irradiation (λ > 420 and 455 nm). It is worthwhile noting that the most active Ag3PO4 samples possessed almost the same activity in phenol degradation upon irradiation from visible range (λ > 455 nm) that P25 TiO2 upon UV light. Phenol degradation rate equaled to 3.31 and 3.23 μmol/dm3/min in the presence of branched and rhombic dodecahedral Ag3PO4 particles, while it reached 3.36 μmol/dm3/min in the presence of P25 and UV light. Analysis of the degradation intermediates indicated that the benzoquinone was the primary byproducts of phenol degradation. Scavengers-assisted photocatalytic test confirmed that mainly %O2 − has been involved in phenol degradation under visible radiation. Surface composition analysis by XPS suggested that higher total silver content favors photoactivity, while higher ratio of Ag0 to Ag+ suppress photoactivity. Long term photocatalytic tests also implies that increase in Ag0 amount at the Ag3PO4 surface, due to photoreduction of Ag ions, rusulted in activity drop.
Author Julia Zwara (FCh / DET / LPh)
Julia Zwara,,
- Laboratory of Photocatalysis
, Ewelina Grabowska (FCh / DET / LPh)
Ewelina Grabowska,,
- Laboratory of Photocatalysis
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Journal seriesJournal of Photochemistry and Photobiology A-Chemistry, ISSN 1010-6030, (A 25 pkt)
Issue year2018
Vol367
Pages240-252
Publication size in sheets0.6
Keywords in EnglishAg3PO4, branched Ag3PO4, rhombic dodecahedral Ag3PO4, photocatalyst, vis light, heterogeneous photocatalysis
DOIDOI:10.1016/j.jphotochem.2018.08.006
URL https://doi.org/10.1016/j.jphotochem.2018.08.006
Languageen angielski
Score (nominal)25
ScoreMinisterial score = 25.0, 17-09-2018, ArticleFromJournal
Ministerial score (2013-2016) = 25.0, 17-09-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 2.625 (2) - 2016=2.493 (5)
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