The promoted oxidation of CO induced by the visible-light response of Au nanoparticles over Au/TiO2

► Au/TiO2 exhibited a visible-light response induced by the LSPR of Au nanoparticles. ► Visible-light response of Au enhanced the adsorption of CO and its activation. ► Visible-light response of Au promoted the oxidation of CO over Au/TiO2.