Figure 3.

(a) Reaction between hydroxyl radical (OH) and terephthalic acid (TA); (b) fluorescence spectra of reaction system including only TA; TA and H₂O₂; TA, CeO₂, and H₂O₂ after 2 h of reaction. [TA] = 0.5 mM, H₂O₂ = 1 mM, [CeO₂] = 0.25 mg/mL.