Study On Antifouling Performance Of Fluorocarbon Resin Coatings Enhanced By 2D Conjugated Composite Photocatalysts

Marine fouling organisms have been an important focus for a long time.With the development of shipping and marine industry development,the problem of biofouling has become more and more severe.The strong oxidative radicals produced by photocatalysts can kill marine bacterial which were attached to the surface of antifouling coatings,and then prevent the subsequent attachment of large fouling organisms.In this paper,the two-dimensional conjugated materials such as graphene and g-C3N4 are combined with traditional and advanced photocatalytic material TiO2,Ag2WO4 and BiOIO3.The high conductivity and adsorbability of 2D conjugated materials can endue higher activity to photocatalytic materials.And the composite photocatalysts are used to modify the fluorocarbon resign coating(PEVE)to improve the antifouling performance.The results are summarized as follows:(1)The graphene/TiO2 composite photocatalyst was prepared by hydrothermal method,and then used to modify PEVE coating.The antifouling performance was test under the UV irradiation.Experimental results show that the addition of graphene/TiO2 composites can significantly improve the antifouling property of the coating.The photogenerated electrons can be rapidly transferred by graphene,and providing more active sites for photocatalytic reaction.The hydrophilic influence of TiO2 on the composite coating also can be reduced by the hydrophobicity of graphene.(2)Advanced photocatalyst Ag2WO4 was modified by g-C3N4,metastable phase with higher photocatalytic activity ?-Ag2WO4 can be stable present due to that the strong chemisorption of g-C3N4(0 0 2)plane and ?-Ag2WO4(1 1 3)plane.The composite coatings modified by g-C3N4/Ag2WO4 composite photocatalysts exhibit excellent sterilization performance under visible light,and the sterilization rate was close to 100%after 90 min illumination.The Z-scheme heterojunction between g-C3N4 and Ag2WO4 inhibited the recombination of the photogenerated electron-hole pairs and the photocatalytic activity and stability,the photocorrosion of Ag2WO4 can also be reduced.(3)BiOIO3 and g-C3N4/BiOIO3 composite photocatalysts were prepared via microwave hydrothermal method,and were used to modify PEVE coating.The composite coating exhibits excellent photocatalytic photocatalytic activity,and the sterilization rate can reach more than 98%after 45 min irradiation of visible light.The strong oxidizing free radicals can be produced by BiOIO3,which benefit to photocatalytic sterilization.The band gap of BiOIO3 shortened by the addition of g-C3N4,and has good ability of visible light response.The Z-type of electron transport mechanism between g-C3N4 and BiOIO3 enhances the separation efficiency of photogenerated electrons and holes,and enables photoelectron to participate in the photocatalytic reaction process.