Xu Xuelu, Zhao Jiao, Jiang Yunfei, Tang Xiaojia, Zhou Zihao, Zhu Yimin
Institute of Environmental Remediation, Dalian Maritime University, 116026 Dalian, China E-mail:
Water Sci Technol. 2018 Aug;78(1-2):339-346. doi: 10.2166/wst.2018.301.
In this study, Mn-Ce-O/γ-AlO supported catalysts were adopted to promote the removal efficiency of aniline in simulated wastewater with ozone. Mn-Ce-O/γ-AlO catalysts were prepared by the impregnation-calcination method. Its phase structure, specific surface area, loading amount and distribution of active units were analyzed by XRD, BET, ICP-AES and TEM/SEM respectively. The characterization results demonstrated that the catalysts had a good dispersion of Mn-Ce-O active sites and an abundant porous structure from the γ-AlO support. The catalytic ozonation results showed that with Mn-Ce-O/γ-AlO(1.0), the aniline removal efficiency was highly improved, 15.0% higher than that of ozonation without a catalyst. Furthermore, from the variation in loading amounts of Mn and Ce, it can be seen that the molar ratio of Mn and Ce within the Mn-Ce-O plays a key role in accelerating the ozonation of aniline in simulated wastewater with ozone, while Mn:Ce = 1.9:1 showed the best performance. More importantly, the catalysts showed high recycling performance and could be reused at least 12 times without obvious loss of activity.
在本研究中，采用Mn-Ce-O/γ-Al₂O₃负载型催化剂来提高臭氧对模拟废水中苯胺的去除效率。Mn-Ce-O/γ-Al₂O₃催化剂通过浸渍-煅烧法制备。分别采用XRD、BET、ICP-AES和TEM/SEM对其相结构、比表面积、负载量和活性单元分布进行了分析。表征结果表明，催化剂中Mn-Ce-O活性位点分散良好，且γ-Al₂O₃载体具有丰富的多孔结构。催化臭氧化结果表明，使用Mn-Ce-O/γ-Al₂O₃(1.0)时，苯胺去除效率显著提高，比无催化剂的臭氧化高出15.0%。此外，从Mn和Ce负载量的变化可以看出，Mn-Ce-O中Mn与Ce的摩尔比在加速臭氧对模拟废水中苯胺的臭氧化过程中起关键作用，其中Mn:Ce = 1.9:1时表现出最佳性能。更重要的是，该催化剂显示出高循环性能，至少可重复使用12次而活性无明显损失。
