The Preparation of Graphene Oxide and Using It as Catalyst for the Hydrolyzation of Soybean Isoflavone

Graphite oxide is a layered material consisting of hydrophilic oxygenated graphene bearing oxygen functional groups on their basal planes and edges.In this paper,the graphene oxide bearing with-SO3H,-COOH and-OH was prepared by the modified Hummers method and characterized,and which was used as a catalyst for the first time for the hydrolyzation of soybean isoflavone glycosides.Experimental results show that the graphene oxide has good catalytic activity for the hydrolyzation reactions.The optimal reaction temperature of the catalytic reaction is 105 ℃,at which the conversions of three kinds of isoflavone glycosides are 94.3%,92.1%,and 88.8%,and the yields of the corresponding aglycones are 69.6%,60.6%,and 58.8%,respectively.Comparing with other commercial solid acid catalysts,such as zeolite HZSM-5 and macroporous resin NKA-9,the catalytic activity of the prepared graphene oxide is remarkably higher,which is similar to that of 0.02 mol?L?1 sulfuric acid.