ABSTRACT Heterogeneous catalytic ozonation is an efficient technology for degrading refractory organic pollutants in water. However, most studied heterogeneous catalysts for catalytic ozonation were powders, which were not practically available for continuous fixed-bed reactor in water treatment. In this work, manganese, iron and cerium oxides on γ-Al2O3 pellets were synthesized and used as heterogeneous catalysts for catalytic ozonation in a continuous fixed-bed reactor. Results showed that all the prepared metal oxides on γ-Al2O3 pellets exhibited facilitated catalytic ozonation for degrading refractory contaminates compared with ozonation alone and catalytic ozonation on pure γ-Al2O3 pellets. The cerium oxides supported on γ-Al2O3 pellets (CeO2/γ-Al2O3) performed best catalytic performance with the COD removal efficiency of 64.3% and TOC removal efficiency of 41.7%. Moreover, the catalytic activity was further enhanced by the synergistic effect of the bimetallic oxides on γ-Al2O3 pellets (CeO2-Fe2O3/γ-Al2O3). This study is expected to help to encourage further research and applications in AOPs based on the success of this work in designing heterogeneous catalysts available for continuous fixed-bed reactor.

中文翻译：

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γ-Al2O3 颗粒上锰、铁和铈氧化物催化臭氧化降解有机污染物的连续固定床反应器

摘要 多相催化臭氧化是一种有效的降解水中难降解有机污染物的技术。然而，大多数研究的用于催化臭氧化的多相催化剂是粉末，这在水处理中实际上不适用于连续固定床反应器。在这项工作中，合成了γ-Al2O3 球团上的锰、铁和铈氧化物，并将其用作连续固定床反应器中催化臭氧化的多相催化剂。结果表明，与单独臭氧化和在纯 γ-Al2O3 球团上的催化臭氧化相比，在 γ-Al2O3 球团上制备的所有金属氧化物都表现出促进催化臭氧化降解耐火污染物的作用。负载在 γ-Al2O3 颗粒上的氧化铈 (CeO2/γ-Al2O3) 表现出最好的催化性能，COD 去除效率为 64。3% 和 TOC 去除效率为 41.7%。此外，双金属氧化物对γ-Al2O3球团（CeO2-Fe2O3/γ-Al2O3）的协同作用进一步提高了催化活性。基于这项工作在设计可用于连续固定床反应器的多相催化剂方面取得的成功，该研究有望有助于鼓励进一步研究和应用 AOP。