Heterogeneous catalytic ozonation is valid for the advanced oxidation of organic pollutants in wastewater, but it is usually used in the packing bed with granular supports/catalysts with considerable fluid resistance and unsatisfactory ozone utilization efficiency in practical wastewater treatment. Herein, CeO₂-modified monolithic ceramic foams (CeO₂/AlCF) were developed for the efficient catalytic ozonation of refractory organic pollutants in a continuous-flow mode. The TOC removal efficiency of phenol by CeO₂/AlCF was about 80% with a hydraulic retention time (HRT) of 12 min. The system also showed high TOC removal efficiencies (68%–81%) for other organic pollutants including oxalic acid, 2,4-dimethylphenol, and p-nitrophenol. The chemical oxygen demand (COD) of the biological treatment effluent of petrochemical wastewater decreased from 136 mg L⁻¹ to 45.2 mg L⁻¹ with a COD removal efficiency of nearly 67%. The ozone utilization efficiencies of CeO₂/AlCF ranged from 53% to 73%, which were much higher than those of granular catalysts (42–68%). The quenching experiments and EPR analysis revealed that the process followed a hydroxyl radical mechanism. H₂ temperature-programmed reduction (H₂-TPR) analysis showed that the transition of Ce⁴⁺ to Ce³⁺ in CeO₂/AlCF was much easier than that in CeO₂ and hence had a better catalytic capability.

中文翻译：

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CeO2 改性整体陶瓷泡沫用于连续流反应器中难熔有机污染物的高效催化臭氧化


非均相催化臭氧化对于废水中有机污染物的高级氧化是有效的，但在实际废水处理中通常采用颗粒载体/催化剂的填料床，流体阻力较大，臭氧利用效率不理想。本文中，开发了CeO ₂改性整体陶瓷泡沫（CeO ₂ /AlCF），用于以连续流模式对难熔有机污染物进行高效催化臭氧化。 CeO ₂ /AlCF对苯酚的TOC去除效率约为80%，水力停留时间(HRT)为12 min。该系统对草酸、2,4-二甲基苯酚和对硝基苯酚等其他有机污染物也表现出较高的 TOC 去除效率（68%–81%）。石化废水生物处理出水化学需氧量（COD）由136 mg L ^-1下降至45.2 mg L ^-1 ，COD去除率近67%。 CeO ₂ /AlCF的臭氧利用效率为53%~73%，远高于颗粒催化剂（42%~68%）。猝灭实验和EPR分析表明该过程遵循羟基自由基机制。 H ₂程序升温还原(H ₂ -TPR)分析表明CeO ₂ /AlCF中Ce ⁴⁺向Ce ³⁺的转变比CeO ₂中更容易，因此具有更好的催化能力。