Graphene and ferroferric oxide@gold composite material and preparation method and application thereof

A method of preparing a graphene and Fe3O4-Au composite, comprising the following steps:

• (1) preparing a thiol alkyl azide-modified Fe3O4-Au complex and an alkynylated graphene oxide,
• wherein, the preparing a thiol alkyl azide-modified Fe3O4-Au complex includes the following steps:
• dispersing a nano-ferroferric oxide in a reductant solution, performing sonication and heating to 65° C. to 75° C., adding a chloroauric acid aqueous solution dropwise under stirring, stopping heating after reaction, and then stirring to conduct ripening reaction to obtain a Fe3O4-Au complex with a core-shell structure;
• and
• placing the Fe3O4-Au complex and a thiol alkyl azide in a first solvent to perform a reaction at 40 to 45° C. under stirring in a protective atmosphere, and then rinsing repeatedly with a second solvent to obtain the thiol alkyl azide-modified Fe3O4-Au complex;
• the preparing an alkynylated graphene oxide includes the following steps:
• placing a graphene oxide in an activator to conduct an activating reaction at a condition of 65 to 75° C., and then adding propargyl alcohol to continue reacting for 20 to 28 h to obtain the alkynylated graphene oxide;
• and
• (2) preparing a graphene and Fe3O4-Au composite,
• wherein, the thiol alkyl azide-modified Fe3O4-Au complex and the alkynylated graphene oxide prepared in the step (1) are dispersed in a third solvent, a catalyst is added, and the reaction is stirred in a protective atmosphere to collect a product that is the graphene and Fe3O4-Au composite.