The invention discloses a surface-functionalized coconut
fiber and a preparation method and application thereof, the surface of the coconut
fiber is subjected to oxidation treatment and is rich in negative charges, and at least three
layers of films formed by microorganisms are attached to the surface of the coconut
fiber. Compared with the prior art, the invention has the following advantages: (1) efficient adsorption and degradation: through surface functionalization treatment and construction of a multi-layer
biological membrane, the specific surface area and adsorption capacity of the coconut shell fiber are greatly improved, so that the coconut shell fiber has significant advantages in capture and removal of micro-plastics, and the removal efficiency reaches 85-95%; meanwhile, microorganisms in the
biological membrane further have the capacity of degrading micro-plastics, and accumulation of the microorganisms in the environment is further reduced; (2) the method is suitable for various micro-plastic types and particle sizes, and the application scene is wide; and (3) the
economic feasibility is strong: the coconut fiber as a cheap and strong-availability
natural material has high application value after being treated by the technology disclosed by the invention, the
water treatment cost can be effectively reduced, and the method has wide industrial application prospect.