In order to improve the visible light photocatalytic activity of TiO2,many approaches like coupled with other oxides,doping with nonmetal elements have been developed.However,to the best of our knowledge,limited work has been done on the mesoporous carbon and titania nano/heterojunction with graphene carbon nitride(g-C3N4)for the purpose of solar conversion.Herein,we present the fabrication and characterization of mesoporous g-C3N4/C-TiO2 ternary nanojunction.Such architecture provides a broadening optical window for effective light harvesting,short diffusion distance for excellent charge transport,as well as a large contact area for fast interfacial charge separation and photoelectrochemical reactions.As a result,this material is anticipated to exhibit good photocatalytic activity,as eviced by the degradation of methylenblue(MB)under visible light.