▎ 摘　　要

NOVELTY - Preparation of graphene oxide film derived from cassava slag involves (s1) extracting cassava powder, crushing using crusher, and drying the cassava slag, (s2) pyrolyzing the cassava slag at high temperature, grinding and sieving to obtain cassava slag biological carbon, (s3) processing cassava algae slag biological carbon using two-step oxidation method to obtain graphene oxide derived from cassava slag, and recycling concentrated sulfuric acid mixed solution after oxidation (A), and (s4) processing the graphene oxide derived from cassava slag using vacuum-filtering. USE - Preparation of graphene oxide film derived from cassava slag. ADVANTAGE - The method aims to solve the problem that the natural graphene is limited, and excessive exploitation will affect the environment. The method uses waste cassava slag as carbon source for preparing graphene oxide, compared with the existing method in graphite as carbon source, the waste is converted to high value-added product and reduces the consumption of graphite.