▎ 摘　　要

NOVELTY - Preparing apricot shell-based nitrogen-doped graphene quantum dots comprises (i) washing and drying apricot shells, adding into a crusher and crushing, soaking in a zinc chloride solution, adding the apricot shells into a 50-200degrees Celsius constant temperature oven to dry for 10-30 hours, subjecting dried apricot shells to high-temperature activation treatment and drying in a constant temperature oven for 2-8 hours to obtain the finished apricot shell carbon, and (ii) adding prepared 0.05-0.5 g apricot shell carbon into the container, placing the container in the reactor containing 1-3 ml concentrated nitric acid, placing the reactor in oven at 120-180degrees Celsius for heating reaction for 1-6 hours, filtering reacted container in situ, and collecting yellow filtrate to obtain apricot shell-based nitrogen-doped graphene quantum dot solution. USE - The apricot shell-based nitrogen-doped graphene quantum dot is useful for fluorescence detection of vitamin C (claimed). ADVANTAGE - The method utilizes waste biomass raw materials to prepare graphene quantum dot fluorescent probes, and can detect vitamin C quickly and without interference, is easy to operate, economical and environmentally friendly, conforms to the concept of green sustainable development, and meets the requirements of large-scale production in the industry. The quantum dot has stability and strong anti-interference ability as a fluorescent probe. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for used method apricot shell base nitrogen-doped graphene quantum dot in fluorescence detection of vitamin C, comprising (a) diluting apricot shell-based nitrogen-doped graphene quantum dot solution with water to obtain a detection solution, exciting apricot shell-based nitrogen-doped graphene quantum dot with excitation wavelengths of 10 nm intervals, where slits are 5-10 nm for fluorescence measurement to obtain the maximum wavelength of fluorescence emission peak intensity, and (b) taking the diluted apricot shell-based nitrogen-doped graphene quantum dot solution in the quartz cuvette, adding 10-100 microM ferric iron solution to obtain a test system, measuring the fluorescence intensity under different AA concentrations, and drawing a sensing curve graph by fluorescence intensity versus AA concentration.