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Titania modification with a ruthenium(II) complex and gold nanoparticles for photocatalytic degradation of organic compounds

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Title: Titania modification with a ruthenium(II) complex and gold nanoparticles for photocatalytic degradation of organic compounds
Authors: Zheng, Shuaizhi Browse this author
Wei, Zhishun Browse this author
Yoshiiri, Kenta Browse this author
Braumueller, Markus Browse this author
Ohtani, Bunsho Browse this author →KAKEN DB
Rau, Sven Browse this author
Kowalska, Ewa Browse this author →ORCID
Issue Date: 1-Jan-2016
Publisher: Royal Society of Chemistry
Journal Title: Photochemical & Photobiological Sciences
Volume: 15
Issue: 1
Start Page: 69
End Page: 79
Publisher DOI: 10.1039/c5pp00345h
PMID: 26661372
Abstract: Titania of fine anatase nanoparticles (ST01) was modified successively with two components, i.e., a ruthenium(II) complex with phosphonic anchoring groups [Ru(bpy)(2)(4,4'-(CH2PO3H2)(2)bpy)](2+) bpy = 2,2'-bipyridine ((RuCP)-C-II) and gold nanoparticles (Au). Various compositions of two titania modifiers were investigated, i.e., Au, Au + (RuCP)-C-II, Au + 0.5Ru(II)CP, (RuCP)-C-II, 0.5Ru(II)CP and 0.25Ru(II)CP, where Au and (RuCP)-C-II correspond to 0.81 mol% and 0.34 mol% (with respect to titania), respectively. In the case of hybrid photocatalysts, the sequence of modification (ruthenium(II) complex adsorption or gold deposition) was investigated to check its influence on the resultant properties and thus photocatalytic performance. Diffuse reflectance spectroscopy (DRS), X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM) were applied to characterize the structural properties of the prepared photocatalysts, which confirmed the successful introduction of modifiers of the ruthenium(II) complex and/or gold NPs. Different distributions of gold particle sizes and chemical compositions were obtained for the hybrid photocatalysts prepared with an opposite sequence. It was found that photocatalytic activities depended on the range of used irradiation (UV/vis or vis) and the kind of modifier in different ways. Gold NPs improved the photocatalytic activities, while (RuCP)-C-II inhibited the reactions under UV/vis irradiation, i.e., methanol dehydrogenation and acetic acid degradation. Oppositely, (RuCP)-C-II greatly enhanced the photocatalytic activities for 2-propanol oxidation under visible light irradiation.
Type: article
Appears in Collections:触媒科学研究所 (Institute for Catalysis) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: Ewa Kowalska

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