Hydrogen peroxide enhancing the process of MnO2-modified ceramic membrane catalyzing micro-nano bubble

[Display omitted] •Fabricating MnO2-modified ceramic membrane with different morphologies.•Developing the evolution mechanism of modified membrane morphology.•Improving the collapse efficiency of micro-nano bubble (MNB) by adding H2O2.•Combining Fenton-like reaction and MNB catalysis on the modified membrane. In this study, MnO2-modified ceramic membranes (MnO2@CMs) with different morphologies were prepared via hydrothermal method. The concentration of K+ and H+ in the solution determined the morphological evolution of the MnO2 on the CM. We then structured a H2O2/MNB/MnO2@CM system through adding H2O2 to the system of MnO2@CM coupling MNB. The performance analysis of the MnO2 catalyst, including loading, pH zero point charge, crystalline phase, and Mn(Ⅲ) content, determined that the sheet-like MnO2@CM was the most effective for removing pollutants in the H2O2/MNB/MnO2@CM system, achieving 99.45% decolorization and 73.07% TOC removal of methylene blue (model pollutant). The durability of the system was also confirmed through tests on membrane water flux, reuse, and manganese leaching. Mechanism analysis revealed that H2O2 could induce MNBs to generate reactive oxygen species (ROS) in the solution through reaction or hydrolyzing H+, which acted as a pretreatment for MnO2@CM catalytic filtration. In addition, a Fenton-like reaction was also formed on the surface of the MnO2@CM. These reactions greatly enhanced the process of MnO2@CM catalyzing MNB and its efficiency for removing pollutants. This work provides important insights for designing more efficient catalytic CMs and developing novel processes for wastewater treatment.