The water remediation process involves two mechanisms. A chemical reaction of MnO2 and H2O2 produces O2 bubbles at the particle-liquid interface. A fast decomposition of the fuel, in the presence of a surfactant (e.g. sodium dodecyl sulfate, SDS), allows O2 molecules to nucleate and form a recoil of bubbles that pushes the particle to the forward direction. During the reaction, several types of radicals are generated, which react with the pollutant molecules and degrade them. This mechanism is called chemical degradation (CD). Moreover, the O2 bubbles decorated with anionic surfactant molecules can electrostatically adsorb positively charged dye molecules. The fresh bubbles are continuously produced as the process continues and a dye-rich foam is produced. This process is called adsorptive bubble separation (ABS). Scheme 1 depicts the propulsion mechanism and CD of dye molecules by MnO2 micromotors. Scheme 1. Graphical illustration of water remediation by dual-effect of MnO2 micromotors.