Parasitic Light Absorption, Rate Laws and Heterojunctions in the Photocatalytic Oxidation of Arsenic(III) Using Composite TiO₂ /Fe₂ O₃.

ABSTRACT: Composite photocatalyst-adsorbents such as TiO₂ /Fe₂ O₃ are promising materials for the one-step treatment of arsenite contaminated water. However, no previous study has investigated how coupling TiO₂ with Fe₂ O₃ influences the photocatalytic oxidation of arsenic(III). Herein, we develop new hybrid experiment/modelling approaches to study light absorption, charge carrier behaviour and changes in the rate law of the TiO₂ /Fe₂ O₃ system, using UV-Vis spectroscopy, transient absorption spectroscopy (TAS), and kinetic analysis. Whilst coupling TiO₂ with Fe₂ O₃ improves total arsenic removal by adsorption, oxidation rates significantly decrease (up to a factor of 6

SUBMITTER: Bullen JC 

PROVIDER: S-EPMC9306794 | biostudies-literature | 2022 Mar

REPOSITORIES: biostudies-literature