Atmospheric-Pressure Cold Plasma for Preparation of High Performance Pt/TiO2 Photocatalyst and Its Mechanism

被引：49

作者：

Di, Lanbo ^{[1
]}

Zhang, Xiuling ^{[1
]}

Xu, Zhijian ^{[1
]}

Wang, Kai ^{[1
]}

机构：

[1] Dalian Univ, Coll Phys Sci & Technol, Dalian 116622, Peoples R China

来源：

PLASMA CHEMISTRY AND PLASMA PROCESSING | 2014年 / 34卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Atmospheric-pressure cold plasma; Dielectric barrier discharge (DBD); Pt/TiO2; Photocatalyst; Optical emission spectra (OES); REDUCTION; NANOPARTICLES; TIO2; TEMPERATURE; CATALYST; OXIDATION; FILMS; AU; PD;

D O I：

10.1007/s11090-013-9515-z

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

Atmospheric-pressure dielectric barrier discharge (DBD) cold plasma was employed to fabricate Pt/TiO2 photocatalyst using the mixture of Ar and H-2 as working gas. X-ray photoelectron microscopy (XPS) and transmission electron microscopy (TEM) measurements were used to characterize the Pt/TiO2 photocatalyst. The results showed that H2PtCl6 was completely reduced to metallic Pt nanoparticles when the treating time was increased to 6 min. In addition, the Pt/TiO2 photocatalyst prepared by atmospheric-pressure DBD cold plasma (Pt/TiO2-P) showed high dispersion and smaller size of Pt particles, and enhanced metal-support interaction. The photocatalytic degradation of methylene blue (MB) was chosen as a model reaction to evaluate the activity of the Pt/TiO2 photocatalyst. The apparent rate constant of 0.5 wt% Pt/TiO2-P for the MB photodegradation was 1.4 times higher than that over 0.5 wt% Pt/TiO2-C sample (prepared by thermal reduction method). This may be attributed to the smaller size and high dispersion of Pt particles, and the enhanced metal-support interaction in Pt/TiO2-P sample, which was consistent with the results of XPS and TEM. The influence of Pt content on photocatalytic activity of Pt/TiO2-P was investigated, and the highest apparent rate constant was obtained at 0.5 wt% Pt content. This was much lower than that prepared by conventional methods. Optical emission spectra (OES) were observed during the reduction process of Pt ions by atmospheric-pressure DBD cold plasma, and the reduction mechanism was further discussed.

引用

页码：301 / 311

页数：11

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