Promotion of catalytic ozonation of aniline with Mn-Ce-O/γ-AlO.

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.