Titanium dioxide (TiO2), a naturally occurring mineral, is one of the most used metal oxide nanoparticles due to its special properties. Nanoparticles generally have higher reactivity than larger particles of the same material. Nanoparticles can interact with natural organic material (NOM), affecting the surface speciation and net charge of the nanoparticles. This might alter the mobility of nanoparticles in surface waters and in soils, thus determing their bioavailability and toxicity.      This study is focused on the reactivity of synthetic nanoparticles in aqueous solution as a function of pH, ionic strength, and in the presence of organic molecules. Synthesized and well-characterized TiO2 (anatase) nanoparticles were used as test nanoparticles and selected phenolic carboxylic compounds were used as model substances to mimic the interactions of nanoparticles with NOM. The aggregation and surface charging of the particles were studied by simultaneously monitoring the changes in particle size and zeta potential during the reactions.

Colloidal stability of titaniumdioxide nanoparticles in the presence of phenolic carboxylic compounds

245th National Meeting (2013)

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