Fig. 2. Product analyses of the model reaction system (Co₃O₄/PMS/PhOH).

a STEM, HAADF, and EDS elemental mapping images of the Co₃O₄ after the reaction. b TGA curves of the pristine and reacted Co₃O₄ in air (O₂). The mass loss of 20% for the reacted Co₃O₄ was equal to the initial concentration ratio of [PhOH] to [PhOH] + [Co₃O₄], which indicates that the pollutant molecules were fully transferred to the catalyst surface. c 3D-FTIR spectra of the gas products detected from TGA of the reacted Co₃O₄ in b. The decomposition temperature (centered Around 300 °C) in air (O₂) and the gas product (CO₂) are characteristic of polymers. d, e XPS spectra (d) and FTIR spectra (e) of the pristine and reacted Co₃O₄. The signal intensities in the XPS spectra of the pristine and reacted Co₃O₄ were normalized by that of Co 2p.