▎ 摘　　要

NOVELTY - Amino acid modified nano particle, comprises nano particle, amino acid and a grafting unit for grafting the nano particle and amino acid, where the grafting unit is silane coupling agent. USE - The nano particle is useful for antipollution ultrafiltration membrane. ADVANTAGE - The nano particle realizes the hydrophilic surface modification of the nanoparticles; ensures the grafting of amino acids on the surface of nanoparticles enhanced by the hydrophilicity of the material and the compatibility and stability with the organic membrane matrix. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: preparing amino acid-modified nanoparticles comprises mixing nanoparticles, a silane coupling agent and an aqueous ethanol solution to obtain a nanoparticle dispersion and mixing nanoparticle dispersion liquid and the amino acid aqueous solution to carry out a grafting reaction to obtain amino acid modified nanoparticles.; and antipollution ultrafiltration membrane, comprising a polymer membrane matrix and amino acid-modified nanoparticles dispersed in the polymer membrane matrix, where amino acid-modified nanoparticles are prepared as mentioned above.