Highly efficient catalytic ozonation in microbubbles solubilization mode to eliminate gas odor: Accelerated electron transfer and cycling at interfacial AgOMn bridge

A pioneering approach for eliminating malodorous gas using an ozone (O₃) microbubble system is introduced. Utilizing the mass transfer characteristics of larger interfacial area and longer bubble residence time, microbubbles achieve a superior solubilization effect in the liquid-phase O₃ process. Mathematical calculations reveal that the diffusion coefficient of O₃ microbubbles is 1.99 times that of conventional bubbles. By adjusting the pH value, electrostatic adsorption of O₃ microbubbles on catalyst surface is further promoted, thereby amplifying the catalytic ozonation ability. Additionally, MnO₂ catalysts with dispersed Ag nanoparticles (Ag/MnO₂) are designed to synergistically enhance the electron transfer in catalytic reaction through electronic metal-support interaction effect. Experimental calculations demonstrate that the (Ag-)O-Mn region in Ag/MnO₂ utilizes electron-rich properties to decompose and activate O₃, facilitating the conversion into abundant OH, O₂^– and ¹O₂. Meanwhile, the electron-poor AgO(Mn) region adsorbs and immobilizes CH₃SH, which is deeply mineralized by reactive oxygen species. This underscores the essentiality of exploiting microbubble properties to construct a liquid-phase O₃ catalytic process with high mass transfer, offering a new perspective for the purification and treatment of malodorous waste gas.