Synthesis of triphasic, biphasic, and monophasic TiO2 nanocrystals and their photocatalytic degradation mechanisms

Synthesis of triphasic, biphasic, and monophasic TiO2 nanocrystals and their photocatalytic... The preparation of the triphasic (anatase/rutile/brookite), biphasic (anatase/brookite), and monophasic (anatase) TiO2 nanocrystals from peroxotitanium complex (PTC) as precursor by the hydrothermal method was reported in this work. The experimental results indicated that a large window for tuning the phase compositions was achieved by varying the HCl/PTC ratio due to the high stability of PTC. Moreover, the growth mechanism and microstructure evolution of the obtained TiO2 nanocrystals were discussed. The liquid-phase photocatalytic degradation of phenol under UV illumination was used as a model reaction to evaluate the photocatalytic activity of the synthesized materials. The photocatalytic activity is as follows: anatase/brookite biphase > anatase monophase > anatase/rutile/brookite triphase TiO2 nanocrystals. The possible photodegradation mechanism was studied by the examination of active species such as ·OH, photogenerated electrons and holes through adding their scavengers such as methanol, t-BuOH, and K2S2O8. Although the anatase/rutile/brookite triphase TiO2 nanocrystals samples show the most effective separation ability of photo-induced electron–hole pairs, the anatase/brookite biphase TiO2 nanocrystals samples exhibited the highest photocatalytic activity, which can be attributed to effective formation of the activated radicals. Research on Chemical Intermediates Springer Journals

Synthesis of triphasic, biphasic, and monophasic TiO2 nanocrystals and their photocatalytic degradation mechanisms

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Springer Netherlands
Copyright © 2015 by Springer Science+Business Media Dordrecht
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
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