ABSTRACT In this study, new heterogeneous cobalt (Co) catalysts supported on activated carbon (Co/AC) were developed using a wetness impregnation process. The effect of preparation conditions on catalyst characteristics was examined. This work focused on two key parameters: the impregnation rate and the calcination atmosphere (temperature and time). Different catalysts were prepared by varying the Co loading on AC. Various catalysts were characterized by means of nitrogen sorptiometry at 77K, Boehm and pHpzc analysis. It was found that the catalyst properties and the functional surface groups were affected by the operating conditions. The best surface area was 997.5 m2/g obtained when the activated carbon was impregnated with 5% Co loading and calcined at 350°C for 2 h. The effects of parameters, such as cobalt loading, pH, catalyst dose, and ozone dose, were explored on oxalic acid removal (OA). Results show that the use of Co/AC for heterogeneous catalytic ozonation enhanced the degradation efficiency of oxalic acid (OA) significantly compared with simple ozonation and O3/AC. The main results indicate that the optimum catalytic activity was observed when 5% (wt/wt) of Co was supported on AC reaching a catalytic ozonation efficiency of 95%. The results of total organic carbon removal of 91% were achieved at optimum conditions.

中文翻译：

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草酸催化臭氧化用活性炭负载钴的优化研究：操作参数和协同组合的影响

摘要 在这项研究中，使用湿浸渍工艺开发了负载在活性炭上的新型多相钴 (Co) 催化剂 (Co/AC)。考察了制备条件对催化剂特性的影响。这项工作集中在两个关键参数上：浸渍速率和煅烧气氛（温度和时间）。通过改变活性炭上的钴负载量来制备不同的催化剂。通过在 77K 下的氮吸光度测定、Boehm 和 pHpzc 分析来表征各种催化剂。发现催化剂性能和表面官能团受操作条件的影响。当活性炭用 5% Co 负载量浸渍并在 350°C 下煅烧 2 小时时，获得的最佳表面积为 997.5 m2/g。参数的影响，如钴负载量、pH、催化剂剂量、和臭氧剂量，探讨了草酸去除（OA）。结果表明，与简单臭氧化和 O3/AC 相比，使用 Co/AC 进行多相催化臭氧化显着提高了草酸 (OA) 的降解效率。主要结果表明，当 5% (wt/wt) 的 Co 负载在活性炭上时，催化臭氧化效率达到 95% 时观察到最佳催化活性。在最佳条件下，总有机碳去除率达到 91%。主要结果表明，当 5% (wt/wt) 的 Co 负载在活性炭上时，催化臭氧化效率达到 95% 时观察到最佳催化活性。在最佳条件下，总有机碳去除率达到 91%。主要结果表明，当 5% (wt/wt) 的 Co 负载在活性炭上时，催化臭氧化效率达到 95% 时观察到最佳催化活性。在最佳条件下，总有机碳去除率达到 91%。