Polydopamine assisted synthesis of N-doped Al2O3/PDA/MnO2 for enhanced catalytic ozonation of MB in waste water.

• N-doped Al 2 O 3 /PDA/MnO 2 ozonation catalyst were fabricated by sequential coating of PDA and MnO 2 loading processes. • The PDA polymer can improve the loading and dispersion of MnO 2 on Al 2 O 3 spheres. • The ozonation catalyst showed great enhancement for catalytic ozonation of MB. In this study, a novel N-doped Al 2 O 3 /PDA/MnO 2 ozonation catalyst were fabricated by sequential coating of polydopamine (PDA) via self-polymerization and MnO 2 loading via calcination processes. The ozonation catalyst was characterized by XRD and XPS, confirming the successful preparation of N-doped Al 2 O 3 /PDA/MnO 2. The decoration of PDA polymer can enhance the loading and dispersion properties of MnO 2 on Al 2 O 3 spheres. In contrast, the apparent rate constant of N-doped Al 2 O 3 /PDA/MnO 2 ozonation catalyst for methylene blue (MB) degradation was 2.67 times than that of undoped Al 2 O 3 /MnO 2. This work provides a general strategy for exploring novel polymer-assisted functional Al 2 O 3 based ozonation catalyst for waste water treatment applications. [ABSTRACT FROM AUTHOR]