Polyoxometalate-Aminated Graphene: Preparation Of An Amphiphilic Composite And Its Catalytic Activity For Oxidative Desulfurization

Deep desulfurization of fuel oil is a hot topic in petrochemical and environmental fields.Oxidative desulfurization has attracted much attention due to its ability to achieve deep desulfurization under mild conditions.Keggin-polyoxometalates has been reported that can efficiently catalyze the oxidative desulfurization process of fuel oil with H2O2 as an oxidant.However,the critical obstacle is how to introduce polyoxometalates into the non-polar oil phase.Considering that the organic diamine modified GO possesses good amphipathy and shows strong electrostatic interaction with HPW,we synthesized an amphipathic polyoxometalate-aminated graphene composite(HPW-4NGO)by loading POMs on the aminated graphene(4NGO).Herein,a mass of benzene rings of HPW-4NGO act as hydrophobic groups to introduce HPW into non-polar reaction systems,thus making the active polyoxoperoxo species reacts sufficiently with DBT.The HPW-4NGO exhibited an efficient catalytic activity in a catalytic oxidative desulfurization reaction in model fuel oil wherein DBT was oxidized rapidly and completely to DBTO2.Owing to electrostatic interaction and hydrogen bonding,the catalyst possesses high stability,which could be reused for four times without a significant decrease on the activity.