▎ 摘　　要

NOVELTY - Method for preparing a lanthanum-modified reduced graphene oxide/silica large mesoporous film involves (a) adding graphene oxide to water, ultrasonically treating to obtain a graphene oxide solution, adding cellulose nanocrystal suspension to the solution, ultrasonically treating and magnetic stirring the mixture to obtain a uniform mixture, adding tetramethyl orthosilicate, continuing stirring, adding the obtained mixed solution to a Teflon (RTM: PTFE) petri dish and drying to obtain a chiral nematic graphene oxide/silica/cellulose nanocrystalline film (A), (b) soaking the film (A) in a sulfuric acid solution in a water bath for 7-11 days to obtain a graphene oxide/silica large mesoporous film (B), (c) soaking the film (B) in ethanol solution comprising lanthanum nitrate hexahydrate, shaking hydrothermally and drying and (d) placing the film (B) in a tube furnace under an inert atmosphere for calcining to obtain the product. USE - The method is useful for preparing a lanthanum-modified reduced graphene oxide/silica large mesoporous film, which is useful for treating phosphate groups in water (all claimed). ADVANTAGE - The film does not cause mesoporous blockage easily during adsorption process, has adsorption capacity in a phosphate solution (having initial concentration of 200 mg/l) of 56 mg/g, has mesopore pore size of more than 20 nm, has rapid adsorption rate and improved mechanical properties, and is easy for recycle process and convenient for continuous operation.