Previous studies have found the significant role of impurities (i.e., silicon, phosphorus) in the aggregation and sedimentation of TiO2 nanoparticles in aqueous environment. In this study, we investigated the release kinetics of the impurities from 5 types of TiO2 nanoparticles (i.e., 5, 10, and 50 nm anatase and 10 � 40, 30 � 40 nm rutile) at various pH and time scale. At both acidic and basic conditions, the 10 � 40 nm rutile showed the most leachable quantities of silicon; whereas, the 50 nm anatase showed the most leachable quantities of phosphorus. Both acidic and basic conditions accelerated the release of silicon, while the basic conditions enhanced the phosphorus release kinetics greatly. In addition, the leachable quantities of silicon and phosphorus increased with the increasing reaction time in aqueous solutions. Raman and FTIR spectroscopies were applied to identify the transformation of the TiO2 nanoparticles in the aqueous environment.

Surface changes and ion release kinetics of titanium dioxide nanoparticles in aqueous environment

243rd National Meeting (2012)

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