Ce^{3 +} 与 Cu^{2 +} 协同强化芬顿体系氧化苯酚的效能与机制研究

Synergistic effect of Ce^{3 +} and Cu^{2 +} on the oxidation efficiency of phenol in different initial pH and H₂ O₂ concentrations by Fenton processes was studied. The experiment results illustrated that Ce^{3 +} / Cu^{2 +} / Fe^{2 +} / H₂ O₂ system had a wider scope of application than Fenton process in the aspect of pH and H₂ O₂ concentration. Phenol was still efficiently degraded by Ce^{3 +} / Cu^{2 +} / Fe^{2 +} / H₂ O₂ at a higher pH (pH = 5. 0) and a higher H₂ O₂ concentration (2. 0 mmol.L ^{- 1} ) . In addition, Cu^{2 +} could react with quinone-like substrates, the oxidation intermediates of phenol, to produce Cu ⁺ , which could catalyze the decomposition of H₂ O₂ to form.OH, while Ce^{3 +} could accelerate the formation of quinone-like substrates and facilitate the cycling of Fe^{3 +} and Fe^{2 +} , to enhance the decomposition of H₂ O₂ to form.OH, the mechanism analysis illuminated the synergy of Ce^{3 +} and Cu^{2 +} . The reactive species in Ce^{3 +} / Cu^{2 +} / Fe^{2 +} / H₂ O₂ system was still proved to be.OH, resulting from the scavenging experiments by adding different radical scavengers.