Preparation Of Carbon-based Photocatalyst And Its Catalytic Performance

With the acceleration of the global industrialization process,the problem of environmental pollution has become increasingly serious,and environmental governance has received widespread attention from countries around the world.Among them,the government has devoted huge human,material and financial resources to the research and development of environmental purification materials and technologies industrialization provides support,of which photocatalytic materials and photocatalytic technology occupy an important position.Photocatalytic technology has become the most anticipated new technology in environmental protection because of its minimum cost,relatively stable conditions and obvious improvement in degradation.At present,the scale of catalyst preparation methods and related studies have shown that various carbonization techniques can be used to prepare catalysts with excellent performance.Carbonation refers to the process of dehydration of organic matter into carbon materials,carbon-forming materials or carbon-containing residues by pyrolysis or decomposition.Carbonized catalysts have the advantages of simple synthesis,low density,large specific surface area,etc.And show great application potential and market value in the field of catalysis.In this paper,templated method was used to prepare Ag/carbonized resin composite,ZnO/carbonized resin composite and ZnO/carbonized microsphere composite.Explore the influence of different preparation methods,different calcination temperature and different calcination time on the catalytic performance of the catalyst.1)Ag/carbonized resin composites were prepared by cation exchange resin as a carrier,through absorption,carbonization,hydration and recombination methods,and characterized by scanning electron microscope and X-ray diffraction.The results showed that the Ag/carbonized resin composite and carbonized resin prepared by vacuum calcination had better degradation effect on methyl orange solution than the Ag/carbonized resin composite and carbonized resin prepared by calcination with nitrogen.The photocatalytic degradation effect of carbonized resin prepared by different calcination temperature and different calcination time under vacuum calcination on methyl orange solution was studied.The results show that when the vacuum calcination temperature is 380?and the calcination time is 4h,the carbonized resin has the highest catalytic activity.The maximum decolorization reduction of the methyl orange solution under UV light for 2h can reach 92.3%,and the decolorization rate of the methyl orange solution under visible light for 2h can reach 23.5%.The different calcination temperature,time and hydration in vacuum calcination environment were studied.The photocatalytic performance of Ag/carbonized resin composite prepared at different concentrations showed that when the methyl orange solution was degraded,the preparation temperature was 320?and the preparation time was 4h.The Ag/carbonized resin was impregnated with 0.1%hydration and dissolved.The composite has the highest catalytic activity,and the maximum decolorization rate of methyl orange solution under UV light for 2h can reach 95.6%,and the decolorization rate of the methyl orange solution under visible light for 2h can reach 26.5%.The experimental results show that the Ag/carbonized resin composite prepared by vacuum calcination is better than the Ag/carbonized resin composite prepared by nitrogen protection calcination no matter under UV light or visible light.2)The ZnO/carbonized resin composite was prepared by cation-exchange resin as a carrier and subjected to adsorption,carbonization and other methods.The ZnO/carbonized resin composite was characterized by means of scanning electron microscope and X-ray diffractometer.The effects of the photocatalytic properties of ZnO/carbonized resin composites prepared by different methods were studied.The results showed that the ZnO/carbonized resin composite prepared by vacuum calcination had better degradation effect on methyl orange solution than the ZnO/carbonized resin composite prepared by calcination with nitrogen.The effects of ZnO/carbonized resin composites prepared under different calcination temperature and time under vacuum calcination environment were studied.The results show that when the ZnO/carbonized resin composite is prepared at 380?and the preparation time is 4h under vacuum calcination environment,the photocatalytic effect is the best.The decolorization rate of methyl orange solution can reach 83.2%for 2h under UV light,and the decolorization rate of methyl orange solution can reach 18.6%for 2h under visible light.3)Using Zn?OH?₂ carbon microspheres as a template,hydrothermal synthesis and carbonization were used to prepare ZnO/carbonized microsphere composites,which were characterized by scanning electron microscopy and X-ray diffractometer.The effects of photocatalytic properties of ZnO/carbonized microsphere composites prepared by different methods were studied.The results showed that the ZnO/carbonized microsphere composite prepared by vacuum calcination had better degradation effect on methyl orange solution than the ZnO/carbonized microsphere composite prepared by calcination with nitrogen.The effect of photocatalytic performance of ZnO/carbonized microsphere composites prepared under different calcination temperature and time under vacuum calcination environment was further studied.The results show that when the ZnO/carbonized microsphere composite preparation temperature is 350?and the preparation time is 4h,The photocatalytic effect is best under UV light,and the decolorization rate of methyl orange solution can reach 77.8%for 2h.However,when the preparation temperature is 380?,the photocatalytic effect is best under visible light.The decolorization rate of methyl orange solution can reach 13.9%for 2h.