Repozytorium publikacji - Politechnika Gdańska

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.

Autorzy

• Magdalena Diak,
• Marek Klein,
• prof. dr hab. inż. Tomasz Klimczuk link otwiera się w nowej karcie ,
• W. Lisowski,
• Hynd Remita,
• Adriana Zaleska-Medynska,
• Ewelina Grabowska