Preparation Of Carbon Materials With Cerium Oxide Hybrid Catalyst And Its Application In The Degradation Of Ammonia

Along with the social development,environmental pollution getting worse,Especially the water pollution problem has aroused people's attention,which cause serious damage to human survival and development,in which ammonia nitrogen is the important cause of water eutrophication and pollution matter,nitrogen and nitrogen concentration is too high,suppresses natural nitration,causes the water of oxygen,reduce the water self-purification ability,thus effectively control the ammonia nitrogen pollution has already become the important subject faced by today's environmental workers.Semiconductor photocatalytic technology is the modern water treatment technologies,due to the stability of catalyst structure,high catalytic activity,no pollution,easy to operate and widely attention.Carbon materials to join widened the scope of the spectral response of the catalyst,improve the use efficiency of visible light.This paper mainly study carbon doped cerium oxide catalyst preparation,characterization and application in the study of the degradation of ammonia nitrogen.Specific as follows:First,CeO₂?CeO₂-rG was prepared by hydrothermal synthesis,for the oxidization degradation of ammonia under visible light irradiation.The catalyst was characterized by XRD,TEM,FT-IR and UV-Vis.The photo-catalytic tests show that the degradation efficiency of ammonia approached 92.4%,under similar conditions over 8h.Another comparison test shows the CeO₂ catalyst reached only to 38%of the degradation efficiency under similar conditions,indicating graphene oxide can accelerate the degradation of ammonia.In 50 ml of ammonia nitrogen concentration and the concentration of rhodamine respectively for 50 mg/L in the solution,adding suitable amount of catalyst,under the uv-visible light lamp illumination,comparing the degradation of ammonia nitrogen effect than the degradation of rhodamine effect is good.The kinetic studies show that the oxidization of ammonia follows the pseudo-first order kinetic law,the rate constant is equal to 4.2×10^-3 min^-1.Four runs show the catalyst is very stable,recoverable,separable and reusable,suggesting its potential application at the disposal of ammonia.Second,CeO₂-NG was prepared by hydrothermal synthesis,for the oxidization degradation of ammonia under visible light irradiation.The catalyst was characterized by XRD,TEM,FT-IR and UV-Vis.The photo-catalytic tests show that the degradation efficiency of ammonia approached 90.4%,under similar conditions over 5h.Another comparison test shows the CeO₂ catalyst reached only to 33%of the degradation efficiency under similar conditions,indicating NG can accelerate the degradation of ammonia.In 50 ml of ammonia nitrogen concentration and the concentration of rhodamine respectively for 50 mg/L in the solution,adding suitable amount of catalyst,under the uv-visible light lamp illumination,comparing the degradation of ammonia nitrogen effect than the degradation of rhodamine effect is good.The kinetic studies show that the oxidization of ammonia follows the pseudo-first order kinetic law,the rate constant is equal to 7.51×10^-3 min^-1.Four runs show the catalyst is very stable,recoverable,separable and reusable,suggesting its potential application at the disposal of ammonia.Third,CeO₂-C₆₀ was prepared by hydrothermal synthesis,for the oxidization degradation of ammonia under visible light irradiation.The catalyst was characterized by XRD,TEM,FT-IR and UV-Vis.The photo-catalytic tests show that the degradation efficiency of ammonia approached 94%,under similar conditions over 7h.Another comparison test shows the CeO₂ catalyst reached only to 38%of the degradation efficiency under similar conditions,indicating C₆₀ can accelerate the degradation of ammonia.In 50 ml of ammonia nitrogen concentration and the concentration of rhodamine respectively for 50 mg/L in the solution,adding suitable amount of catalyst,under the uv-visible light lamp illumination,comparing the degradation of ammonia nitrogen effect than the degradation of rhodamine effect is good.The kinetic studies show that the oxidization of ammonia follows the pseudo-first order kinetic law,the rate constant is equal to 4.35×10^-3min^-1.Four runs show the catalyst is very stable,recoverable,separable and reusable,suggesting its potential application at the disposal of ammonia.Forth,CeO₂-AC was prepared by hydrothermal synthesis,for the oxidization degradation of ammonia under visible light irradiation in the presence of hydrogen peroxide.The catalyst was characterized by XRD,TEM,FT-IR and UV-Vis.The photo-catalytic tests show that the degradation efficiency of ammonia approached91%,under similar conditions over 8h.Another comparison test shows the CeO₂catalyst reached only to 33%of the degradation efficiency under similar conditions,indicating AC can accelerate the degradation of ammonia.In 50 ml of ammonia nitrogen concentration and the concentration of rhodamine respectively for 50 mg/L in the solution,adding suitable amount of catalyst,under the uv-visible light lamp illumination,comparing the degradation of ammonia nitrogen effect than the degradation of rhodamine effect is good.The kinetic studies show that the oxidization of ammonia follows the pseudo-first order kinetic law,the rate constant is equal to 0.1min^-1.Four runs show the catalyst is very stable,recoverable,separable and reusable,suggesting its potential application at the disposal of ammonia.