▎ 摘　　要

NOVELTY - Preparing silicon nitrogen co-doped graphene quantum dot involves preparing by carbon powder and ethylenediamine, where the carbon powder contains silicon dioxide. USE - Method for preparing silicon nitrogen co-doped graphene quantum dot in antibacterial aspect, where the minimum sterilizing concentration in the application of anti-colonbacillus is 2.16 x 10-4 g/mL (all claimed). ADVANTAGE - The method uses the waste carbon powder generated in the printer/copier production process, reduces the waste processing cost, but also reduces the production cost of thegraphene quantum dot; Using the method to produce1 ton graphene quantum dot and the productionmethod recorded in the existing document, does not need to use citric acid, the cost can be reduced by 3 times.