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Photocatalytic Activity of Degussa P25 TiO2/Au Obtained Using Argon (Ar) and Nitrogen (N2) Plasma

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Abstract

Titania Degussa P25 powder was treated with Argon (Ar) and Nitrogen (N2) gas plasma inside of a closed homemade chamber system at 50 Pa of pressure. The electric discharge was generated applying an AC voltage (0–15,000 V) to a pair of aluminum electrodes. Two sets of samples were analyzed. In the first one, the plasma is applied directly on a layer of titania P25 that is spread out on top of one of the electrodes and, in the second one, a gold foil substrate is positioned between the titania powder and the electrode, named TiO2/Au. In the last sample, gold coated titania nanoparticles or clusters of gold are formed, changing the optical properties of the material. The evolution of the optical properties of the obtained samples was analized using UV–Vis diffuse reflectance. The spectra show a shift in the band gap and a broad band in P25/Au associated with the gold plasmonic band. Additionally, the photocatalytic activity was evaluated by monitoring the photodegradation of methylene blue solution (0.01 g/L), using UV–Vis absorption analysis in the range 250–850 nm. After the plasma is applied, the gold impregnation over the titania surface increases the photocatalytic activity.

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Acknowledgments

This work was partially supported by projects CONACYT 49275F, Fomix 108160, 108528, Foncicyt no. 96095 and Multidisciplinario-CINVESTAV. The authors want to express their acknowledgments to M.S. J. Bante for their valuable help in the electronic assembling, and the CONACYT PhD grant given to R. Trejo.

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  1. Departamento de Física Aplicada, CINVESTAV-Unidad Mérida, A.P. 73, Cordemex, C.P. 97310, Mérida, YUC, México

    R. Trejo-Tzab, J. J. Alvarado-Gil & P. Quintana

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  1. R. Trejo-Tzab
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  2. J. J. Alvarado-Gil
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  3. P. Quintana
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Correspondence to R. Trejo-Tzab.

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Trejo-Tzab, R., Alvarado-Gil, J.J. & Quintana, P. Photocatalytic Activity of Degussa P25 TiO2/Au Obtained Using Argon (Ar) and Nitrogen (N2) Plasma. Top Catal 54, 250–256 (2011). https://doi.org/10.1007/s11244-011-9643-8

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