A facile method for preparing Pt/TiO2 photocatalyst with enhanced activity using dielectric barrier discharge

• Published in: Catalysis today Vol. 211; pp. 109 - 113
• Main Authors: Di, Lanbo, Xu, Zhijian, Wang, Kai, Zhang, Xiuling
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.08.2013; Elsevier
• Subjects: Atmospheric-pressure; Catalysis; catalytic activity; Chemistry; cold; Colloidal state and disperse state; Dielectric barrier discharge (DBD); Exact sciences and technology; General and physical chemistry; Mesoporous TiO2; methylene blue; nanoparticles; particle size; Photocatalyst; Photochemistry; photolysis; Physical chemistry of induced reactions (with radiations, particles and ultrasonics); Platinum; Porous materials; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Atmospheric-pressure; Platinum; Photocatalyst; Mesoporous TiO2; Dielectric barrier discharge (DBD); Plasma; Binary compound; Atmospheric pressure; Transition element compounds; Transition metal; Porous material; Mesoporosity; Heterogeneous catalysis; Mesoporous TiO; Titanium oxide
• ISSN: 0920-5861; 1873-4308
• DOI: 10.1016/j.cattod.2013.03.025

•We report a facile method for preparing Pt/TiO2 by DBD plasma.•Narrow size distribution of Pt particles was observed in the TEM images.•The mean particle size of Pt was ca. 1.7nm.•Pt/TiO2 prepared by DBD plasma showed enhanced photocatalytic activity. Atmospheric-pressure dielectric barrier discharge (DBD) cold plasma was employed to fabricate Pt/TiO2 mesoporous photocatalyst. BET, XRD and TEM were used to characterize the Pt/TiO2 mesoporous photocatalyst. BET analysis showed that the mesoporous TiO2 has little change with the DBD plasma treatment. XRD spectra proved that H2PtCl6 was reduced to metallic Pt nanoparticles, and the Pt/TiO2 prepared by DBD plasma (Pt/TiO2-P) showed smaller Pt particles. TEM images showed that Pt particles were homogeneously distributed on the surface of Pt/TiO2-P, and the mean particle size of Pt was ca. 1.7nm, which was much smaller than that in Pt/TiO2 prepared by thermal reduction (Pt/TiO2-C). Photocatalytic activity of the Pt/TiO2 mesoporous photocatalysts was evaluated by photodegradation of methylene blue (MB). Compared with the 0.5wt% Pt/TiO2-C sample, 0.5wt% Pt/TiO2-P exhibited a high activity for MB degradation, and the first-order rate constant in 0.5wt% Pt/TiO2-P photocatalytic process was ca. 2 times higher than that of mesoporous TiO2. Atmospheric-pressure DBD cold plasma was proved to be a fast and facile method for preparing Pt/TiO2 mesoporous photocatalyst with enhanced activity.