In this study, two types of graphene oxides (HGO and BGO) were synthesized by the Brodie method and the Hummers method, respectively, and the correlation between their functional group amount and catalytic activity was evaluated. The amount of functional groups was determined using the Boehm titration method. To evaluate the catalytic activity of GO, a hydrogenation reaction of nitrobenzene was carried out by adding HGO and BGO as catalysts. The total amount of acidic functional groups of HGO

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... s larger than that of BGO. The GC yield of HGO was about 5 times that of BGO. HGO has more total acidic functional groups than BGO and has more localized states at the Fermi level, resulting in that HGO exhibits higher catalytic activity in the reduction of nitro groups.