Preparation Of Carbon Nitride-Based Micro-nanostructure Materials And Studies On Photocatalytic Degradation Of Pollutants

Air and water seem to be common in peopled daily lives,but if there is no water or air in the world,will life still exist?This question is worth pondering for everyone.With the rapid development of the industry,peopled living standards have been improved,however,the environment we live in has been seriously damaged.The emission of automobile exhaust,the massive burning of fossil fuels,the untreated random discharge of industrial wastewater and domestic wastewater have caused air pollution and water pollution,which affected people's health seriously.Therefore,how to governance environmental problems is extremely urgent.Numerous studies have shown that photocatalysis technology has obvious advantages in the governance of environmental problems because of its low cost,mild reaction conditions and no secondary Pollution to the environment.Carbon nitride,a photocatalytic semiconductor material,has been widely used due to their rich sources,easy preparation,strong modification,and visible light response.In this paper,a series of carbon nitride-based micro-nanostructure composite materials are prepared for environmental treatment(wastewater and exhaust gas)and low catalytic efficiency of semiconductor carbon nitride materials.The experimental results reveal that the carbon nitride-based micro-nanostructure composites exhibit an excellent photocatalytic performance in degrading wastewater and exhaust gas.(1)Using core-shell silica spheres as a template to prepare hollow mesoporous carbon nitride nanospheres,and then loading silver bromide nanoparticles on the surface of the hollow mesoporous carbon nitride nanospheres to form a heterojunction for photocatalytic degradation of organic dyes in wastewater.(2)Selecting cheap materials(urea and thiourea)to synthesize honeycomb carbon carbon isotype heterojunction.Due to the similar chemical and crystalline structaures,the heterointerfaces of carbon nitride are natively,which promotes the separation of eharges,thereby improving the performance of photocatalytic NO removal.(3)Three strategies of structure design,elemental doping and defect modification are integrated to prepare defect-modified phosphorus-doped tubular carbon nitride by a simple method.The introduction of a cyano group destroys the ?-? conjugated structure of carbon nitride,which inhibits the recombination of charges,thereby improving the photocatalytic NO removal.