| Ballast water is water carried by ships to ensure the stability and maneuverability during transit.However,ships transporting ballast water between geographically isolated ports contribute to the spread of many aquatic species beyond their natural range limits,and it has became an environmental problem and been regarded as one of the four major risks factors that threaten global marine environmental safety.It is of great significance to study the solution of ballast water.The fluorocarbon resin(PEVE)paint was regarded as the base material in this research,through using composited photocatalyst modified by graphite caebon nitride(g-C3N4)to enhance the sterilization performance of fluorocarbon resin(PEVE)coatings,studying the sterilization mechanisms of composite coatings and providing theoretical basis for the system of photocatalysis/PEVE coatings that been used for killing bacteria.At first,taking TiO2 as the research object and preparing the g-C3N4/Ti02 composite photocatalyst by ultrasonic method,preparing the g-C3N4/TiO2/PEVE coatings and testing the sterilization performance of composite coatings under UV light irradiation.The results showed that the sterilization performance of composite coatings effectively enhanced with the addition of g-C3N4/TiO2 composite photocatalyst.It was found that the separation of electrons and holes of Ti02 been promoted and produced more active species(·OH,·O2-)with sterilization performance,when the sterilization mechanisms of composite coatings was studied.Based on the research of TiO2,taking the Bi2MoO6 material as research object.Through hydrothermal method to prepare the Bi2MoO6 and choose the optimum synthesis method.The results showed that the optimum synthesis method was the hydrothermal conditions was pH=1.Then,the g-C3N4/Bi2MoO6 composite photocatalyst and g-C3N4/Bi2MoO6/PEVE composite coating was prepared by the ultrasonic method,the sterilization performance of composite coatings was tested under visible light irradiation.The results showed that the sterilization performance of the composite coating was effectively enhanced with the addition of g-C3N4/Bi2MoO6 composite photocatalyst.Studying the sterilization mechanisms of composite coatings can be found that the carriers of Bi2MoO6 was increased because of g-C3N4/Bi2MoO6 heterostructure,the existence of g-C3N4 made the rate of electrons-holes recombination reduced,resulting in the production of strong active species(·O2-and h+)with sterilization performance.Also,the physical properties of fluorocarbon resin(PEVE)coatings was tested.The test results showed that there has no effect on physical properties of fluorocarbon resin(PEVE)coatings with the addition of composite photocatalyst,proving the fluorocarbon resin(PEVE)coatings also have good ability. |
