▎ 摘　　要

NOVELTY - Preparation of L-cysteine-graphene oxide nanomaterial comprises mixing graphene oxide and purified water for 1 hour, adding 1-(3-dimethylaminopropyl)-3-ethyl carbodiimide hydrochloride salt and N-hydroxysuccinimide sodium salt, mixing, reacting for 1 hour, adding L-cysteine, reacting for 12 hours, filtering and freeze-drying at - 50 degrees C. USE - Method for preparing L-cysteine-graphene oxide nanomaterial used for reducing arsenic toxicity in zebrafish embryo (all claimed). ADVANTAGE - The nanomaterial reduces arsenic toxicity by 15%. The preparation method is simple and easy.