Zhang Jian-Qiao, Chi Hui-Zhong, Song Yang, Luo Cong-Wei, Jiang Jin, Ma Jun
School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China.
Huan Jing Ke Xue. 2016 Aug 8;37(8):3067-3072. doi: 10.13277/j.hjkx.2016.08.030.
Synergistic effect of Ce and Cu on the oxidation efficiency of phenol in different initial pH and HO concentrations by Fenton processes was studied. The experiment results illustrated that Ce/Cu/Fe/HO system had a wider scope of application than Fenton process in the aspect of pH and HO concentration. Phenol was still efficiently degraded by Ce/Cu/Fe/HO at a higher pH (pH=5.0) and a higher HO concentration (2.0 mmol·L). In addition, Cu could react with quinone-like substrates, the oxidation intermediates of phenol, to produce Cu, which could catalyze the decomposition of HO to form·OH, while Ce could accelerate the formation of quinone-like substrates and facilitate the cycling of Fe and Fe, to enhance the decomposition of HO to form·OH, the mechanism analysis illuminated the synergy of Ce and Cu. The reactive species in Ce/Cu/Fe/HO system was still proved to be·OH, resulting from the scavenging experiments by adding different radical scavengers.
研究了铈（Ce）和铜（Cu）对芬顿法在不同初始pH值和过氧化氢（H₂O₂）浓度下苯酚氧化效率的协同作用。实验结果表明，在pH值和H₂O₂浓度方面，Ce/Cu/Fe/H₂O₂体系比芬顿法具有更广泛的应用范围。在较高的pH值（pH = 5.0）和较高的H₂O₂浓度（2.0 mmol·L⁻¹）下，Ce/Cu/Fe/H₂O₂体系仍能有效降解苯酚。此外，Cu能与苯酚的氧化中间体醌类底物反应生成Cu⁺，Cu⁺可催化H₂O₂分解生成·OH，而Ce能加速醌类底物的形成并促进Fe²⁺和Fe³⁺的循环，增强H₂O₂分解生成·OH，机理分析揭示了Ce和Cu的协同作用。通过添加不同的自由基清除剂进行清除实验，证明Ce/Cu/Fe/H₂O₂体系中的活性物种仍然是·OH。
