Influence of Aqueous Inorganic Anions on the Reactivity of Nanoparticles in TiO₂ Photocatalysis.

ABSTRACT: The influence of inorganic anions on the photoreactivity and aggregation of titanium dioxide nanoparticles (NPs) was assessed by dosing carbonate, chloride, nitrate, phosphate, and sulfate as potassium salts at multiple concentrations. NP stability was monitored in terms of aggregate morphology and electrophoretic mobility (EPM). Aggregate size and fractal dimension were measured over time by laser diffraction, and the isoelectric point (IEP) as a function of anion and concentration was obtained by measuring EPM versus pH. Phosphate, carbonate, and to a lesser extent, sulfate decreased the IEP of TiO₂ and stabilized NP suspensions owing to specific surface interactions, whereas this was not observed for nitrate and chloride. TiO₂ NPs were exposed to UV-A radiation, an

SUBMITTER: Farner Budarz J 

PROVIDER: S-EPMC6471673 | biostudies-literature | 2017 Mar

REPOSITORIES: biostudies-literature