▎ 摘　　要

NOVELTY - The method involves enabling liquid waiting for sterilization to flow through graphene sterilization substances (231) to obtain sterilized liquid and store the sterilized liquid. The graphene sterilization substance is one of graphene oxide, fluorinated graphene, fluorinated graphene oxide and functionalized graphene nanocomposite sterilization substances. The graphene composite sterilization substance is one of graphene oxide or silver nano particle composite, graphene oxide quantum dots or silver nano particle composite, graphene oxide or maghemite nanocomposite, graphene oxide quantum dots or iron oxide composites, graphene oxide or cuprous oxide nanocomposite, and zinc oxide or graphene oxide composite. The liquid to be sterilized is sterilized by ultrasonic waves with a frequency of 20KHz-95KHz. USE - Low-temperature sterilization method for removing microorganism such as bacteria in liquid substance such as Theaceae plant extract and Fangchenggang Camellia nitidissima extract based on graphene nano material. ADVANTAGE - The liquid sterilization is completed at normal temperature by using the substance with sterilization function, so that the heat-labile substances in the liquid are prevented from degrading. The bacteria is killed at normal temperature without high temperature and high pressure, so that the heat-labile substances in the liquid to be sterilized are prevented from degrading, and Theaceae plant extracts to be sterilized is still rich in various nutrients after sterilizing. The various improved graphene sterilization substances with stronger sterilization effect are used for sterilization, so that the sterilization effect is effectively improved and a liquid with more thorough sterilization is obtained. The low-temperature sterilization device has a simple structure, and is easy to manufacture and install and easy to popularize. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a low-temperature sterilization device for removing microorganism in liquid substance based on graphene nano material, has a pumping valve, a low-temperature sterilization unit and a collection device. The pumping valve presses the liquid to be sterilized into the low-temperature sterilization unit. The low-temperature sterilization unit performs low-temperature sterilization on the liquid to be sterilized to obtain sterilized liquid. The collection device collects and stores sterilized liquid. The low-temperature sterilization unit comprises graphene sterilization substances. The low-temperature sterilization unit comprises a sterilization column. Several levels of sterilization screens are arranged inside the sterilization column along the liquid flow direction. The surface of the sterilization screen is coated with the graphene sterilization substance. A sterilization bag is arranged inside the sterilization column, and is located between the sterilization screens at adjacent levels. The sterilization bag is wrapped with the graphene sterilization substance, and meshes are arranged on the sterilization bag. The sterilization screen is a high-defect graphene oxide screen or a laser-induced graphene screen. The mesh number of the high-defect graphene oxide screen is sequentially increased along the liquid flow direction, and mesh number of the laser-induced graphene screen is sequentially increased along the liquid flow direction. The low-temperature sterilization unit comprises a sterilization pool. The sterilization pool is located between the sterilization column and collection device. The graphene sterilization substance is placed inside the sterilization pool, and an ultrasonic generator is arranged. The graphene sterilization substance in the sterilization bag is fluorinated graphene oxide. The graphene sterilization substance in the sterilization pool is the graphene composite sterilization substances. The sterilization column comprises a first sterilization column and a second sterilization column. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the structure of the low-temperature sterilization device for removing microorganism in liquid substance based on graphene nano material. Pumping valve (10) Low-temperature sterilization unit (20) Collection device (30) Graphene sterilization substance (231) Ultrasonic generator (232)