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A simple route for the preparation of P-modified TiO 2: Effect of phosphorus on thermal stability and photocatalytic activity
Abstract : Phosphorus-modified dioxide nanoparticles were prepared by sol-gel method. The effect of phosphorus precursor and calcination temperatures on phase transformation, grain growth and surface area were investigated using various spectroscopic and basic techniques (ICP-AES, XRD, BET, 31P MAS NMR, FT-IR, and UV-vis methods). It was found that the phosphorus existed as amorphous titanium phosphate in TiO 2 framework after calcination at temperature of 500-700°C. As results, slows down the particle growth of anatase and increases the anatase-to-rutile phase transformation. The average crystallite size of P-modified TiO 2 increased dramatically from 8 to 59nm when the temperature increased from 500 to 900°C. This change was associated with the formation of pyrophosphate TiP 2O 7 species through condensation of the concentrated phosphate species. The BET surface area of modified samples was 3.4-fold higher than that of unmodified TiO 2 and was 70% higher than that of commercial Degussa P-25. The photocatalytic activity of P-modified TiO 2 was 1.5-fold higher than that of commercial Degussa P-25 and was 49% higher than that of unmodified TiO 2 under UV irradiation. Phytotoxicity was assessed before and after irradiation against seed germination of tomato (Lycopersicon esculentum).
https://hal-unilim.archives-ouvertes.fr/hal-01045157
Contributeur : Sylvie Rossignol Connectez-vous pour contacter le contributeur
Soumis le : jeudi 24 juillet 2014 - 16:15:44
Dernière modification le : mercredi 20 octobre 2021 - 01:31:18
Contributeur : Sylvie Rossignol Connectez-vous pour contacter le contributeur
Soumis le : jeudi 24 juillet 2014 - 16:15:44
Dernière modification le : mercredi 20 octobre 2021 - 01:31:18
