Preparation And Properties Of Nitrogen-doped Activated Carbon Materials

Nitrogen-doped carbon materials, have amplititude development room in electrochemistry and catalysis applications property, because of the introduction of electron-rich nitrogen. In other hand, surface chemical functional groups, as active centers, dominate the surface chemistry of the activated carbon, wherein the oxygen-containing functional groups on the adsorption properties of activated carbon, play an important role. Therefore, this article used the activated carbon surface oxide modification technology, mainly used strong oxidizing agents at different temperatures, activated carbon surface oxidation treatment, thereby improving the content of the surface oxygen-containing functional groups, as well as to enhance the surface polar polar substances and metals adsorption of ions.On the basis of nitrogen-doped graphene and structural modification of the analysis, firstly, activated carbon is conduced by nitrogen doping and samples are characterized by means of elemental analysis, SEM, BET, FT-IR, XRD, XPS etc.The influence of various factors in the preparation are investigated such as modification reagent, the type of activated carbon material, reaction time and modification times. Secondly, the method of Hummers is used in nitrogen resulting carbon material to modify graphene structure. And we proceed mercury ion adsorption experiments to study the effect of adsorbent dosage and pH on the adsorption properties, and so does the kinetic study of mercury ions.The results show that, melamine and dicyandiamide behave well in the experiment. The physical forms of the carrier have no direct influence on the nitrogen content, and its content depend mainly on the modification reagent. Experiments show that once modification has desired effect in nitrogen-doped and 5h is the best reaction time. Infrared spectra shows that there are forms of C=N, CN,-NH and-NH2 in the nitrogen-doped carbon materials, and XPS results show that there are forms of nitrogen pyridine, pyrrole nitrogen, quaternary nitrogen and nitrogen oxides. There are primarily amino functional groups in materials NC, but exist mainly pyridine nitrogen and quaternary nitrogen in the material NC-HTR. Infrared spectra show that the material prepared in a certain amount of nitrogen-containing functional groups and a small amount of oxygen-containing functional groups structurally modified graphene experiments, and XRD results show that the process of oxidation andreduction processes of the internal structure of the material produced great impact,and NC-OR modified material having a high specific surface area of 987 m2g-1.Mercury and mercury ion assay loss of the material was tested for the commercial activated carbon and carbon materials made NC and NC-OR. It was found that the weak alkaline activity in the surface is the main active sites in adsorption of mercury ions in water, and the material have high rate of adsorption. We find that the load performance is very good, its carrying capacity of the material maintained between 11% to 12%.