Preparation Of Nitrogen Doped Carbon Nanohollow Spheres And The Study On Catalytic Ozonation

Nowadays,carbon nanomaterials are popular in the research direction of materials in various fields.The modified carbon nanomaterials often have polarized electron cloud distribution,excellent catalytic properties,high specific surface area and stable structure.Based on the richness,non-toxicity and similarity with carbon atoms,doping N into carbon nanomaterials can not only preserve the original characteristics of carbon nanomaterials,but also improve the chemical properties and catalytic properties of materials,which is expected to replace the traditional catalysts used in catalytic oxidation and other fields.The purpose of this paper is to synthesize N doped carbon nanohollow spheres by simple preparation methods,to study their application in catalytic ozonation degradation of pollutants in water,and to explore the related catalytic mechanism.In this paper,N doped carbon nanohollow spheres were prepared from dopamine as carbon and nitrogen sources.The surface morphology,carbonization degree,pore structure,N content and catalytic properties were controlled by carbonization temperature by means of SEM,TEM,XRD,FTIR,Raman,BET and XPS.It was found that the catalytic activity of the material was the highest at 800 ?.The KTP in water could be completely removed after 60 minutes of reaction.It was found that catalytic ozonation degradation efficiency was positively correlated with ozone emission,catalyst emission,initial pH and temperature of solution,and negatively correlated with initial concentration of KTP and concentration of humic acid.The degradation of KTP in water is consistent with the pseudo-primary reaction kinetics model,the reaction rate constant is positively correlated with ozone emission,catalyst projection and temperature,and negatively correlated with the initial concentration of KTP,and decreases first and then increases with the increase of pH.The effects of these factors on the reaction rate constant are pH,catalyst dosage,initial concentration of KTP,ozone dosage and temperature.The study of ozone mass transfer showed that the addition of catalyst increased the metastasis rate of ozone from gas phase to liquid phase and increased the utilization of ozone.The results show that the KTP of catalytic ozone degradation water is based on hydroxyl radical theory,and there is a single electron transfer theory.Catalysts can improve the mineralization degree of TOC and embody the advantages of catalytic ozonation.