High-performance activated carbon fiber as well as preparation method and application thereof

The invention belongs to the technical field of carbon fiber material manufacturing, and particularly relates to a high-performance activated carbon fiber and a preparation method and application thereof. The method comprises the following steps: performing ultrasonic treatment on polyacrylonitrile-based activated carbon fiber cloth; and soaking the polyacrylonitrile-based activated carbon fiber cloth subjected to ultrasonic treatment in ammonium acetate to obtain the high-performance activated carbon fiber. The activated carbon fiber obtained through composite modification is microcosmically formed by arranging a large number of carbon fibers in a disordered mode, the structures among the fibers are complex, cavities of different sizes are formed, a large number of gaps exist in the material, and macromolecular pollution gas can be adsorbed. Meanwhile, on the basis that carbon serves as the main structure of the carbon fiber, the surface of the carbon fiber further contains certain oxygen-containing function