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

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Abstract

Atmospheric-pressure dielectric barrier discharge (DBD) cold plasma was employed to fabricate Pt/TiO2 photocatalyst using the mixture of Ar and H2 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.

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Acknowledgments

This work is supported by National Natural Science Foundation of China (Grant No. 21173028), the Science and Technology Research Project of Liaoning Provincial Education Department (Grant No. L2013464), and the Scientific Research Foundation for the Doctor of Liaoning Province (Grant No. 20131004).

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  1. College of Physical Science and Technology, Dalian University, Dalian, 116622, People’s Republic of China

    Lanbo Di, Xiuling Zhang, Zhijian Xu & Kai Wang

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  1. Lanbo Di
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  2. Xiuling Zhang
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Correspondence to Lanbo Di.

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Di, L., Zhang, X., Xu, Z. et al. Atmospheric-Pressure Cold Plasma for Preparation of High Performance Pt/TiO2 Photocatalyst and Its Mechanism. Plasma Chem Plasma Process 34, 301–311 (2014). https://doi.org/10.1007/s11090-013-9515-z

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