Photoactivity of decahedral TiO2 loaded with bimetallic nanoparticles: Degradation pathway of phenol-1- 13 C and hydroxyl radical formation

Magdalena Diak; Marek Klein; Tomasz Klimczuk; W. Lisowski; Hynd Remita; Adriana Zaleska-Medynska; Ewelina Grabowska

doi:10.1016/j.apcatb.2016.06.067

Photoactivity of decahedral TiO2 loaded with bimetallic nanoparticles: Degradation pathway of phenol-1- 13 C and hydroxyl radical formation

Abstract

Decahedral TiO2decorated with bimetallic nanoparticles were synthesized via radiolysis and photode-position method. The effect of bimetallic surface composition (Ag Pt, Ag Au, Au Pd, Au Pt) as well asdeposition technique (simultaneous or sequential) on the photocatalytic activity in phenol degradationand efficiency of hydroxyl radicals generation under UV–vis light irradiation were investigated. Modifiedand pristine decahedral TiO2anatase with exposed {001} were characterized by X-ray diffraction (XRD),diffuse reflectance spectroscopy (DRS), transmission electron microscopy (TEM) with energy-dispersiveX-ray (EDX) spectroscopy, scanning electron microscopy (SEM), inductively coupled plasma-massspectrometry (ICP-MS) and X-ray photoelectron spectroscopy (XPS). The gas chromatography-mass spec-trometry was employed to detect organic intermediates to establish degradation pathway of isotopicallylabeled (1-13C) phenol. The modification with Pt and Ag nanoparticles induced an increase in photocat-alytic activity of phenol degradation under UV–vis light irradiation (79% of phenol was degraded after90 min of irradiation). The main by-products detected in phenol oxidation were catechol, hydroquinone,malonic, fumaric and maleic acid. The results indicated the formation of isotopically labeled and unlabeledmaleic acid. It was noticed that all samples sequentially photodeposited on TiO2surface exhibited higher•OH radicals generation compared to pristine TiO2. Our results suggest that synergistic effects betweenspecifically engineered TiO2nanocrystals and unique properties of loaded bimetallic nanoparticles canenhance the charge separation of photoinduced carriers.

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Authors (7)

Magdalena Diak
Marek Klein
Tomasz Klimczuk prof. dr hab. inż.
W. Lisowski
Hynd Remita
Adriana Zaleska-Medynska
Ewelina Grabowska

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Keywords

FOTOKATALIZA

Details

Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: APPLIED CATALYSIS B-ENVIRONMENTAL no. 200, pages 56 - 71,
ISSN: 0926-3373
Language:: English
Publication year:: 2017
Bibliographic description:: Diak M., Klein M., Klimczuk T., Lisowski W., Remita H., Zaleska-Medynska A., Grabowska E.: Photoactivity of decahedral TiO2 loaded with bimetallic nanoparticles: Degradation pathway of phenol-1- 13 C and hydroxyl radical formation// APPLIED CATALYSIS B-ENVIRONMENTAL. -Vol. 200, (2017), s.56-71
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.apcatb.2016.06.067
Verified by:: Gdańsk University of Technology