Micro-nano bubbles refer to bubbles with a particle size (diameter) between 10 microns and hundreds of nanometers. At the moment of microbubble rupture, due to the drastic change of the disappearance of the gas-liquid interface, the high concentration of ions gathered on the interface will release the accumulated chemical energy at once, which can stimulate a large number of carboxyl free radicals with ultra-high redox potential. Its super strong oxidizing property can degrade pollutants that are difficult to decompose under normal conditions in water. Nanobubbles are injected into oil wells to reduce the surface tension of the liquid, improve the flow of oil, and thus increase oil recovery. By reducing the adhesion between oil and rock, nanobubbles can help release oil from the reservoir.