Preparation Of Porous Carbon Materials By ZnCl₂ Activation And The Study On Its Properties

The porous carbon material is widely used in catalysis, adsorption, sensing and super capacitors fields because of its good electrical conductivity, high mechanical stability, large specific surface area and pore volume, etc. We can improve the performance of the porous carbon material by modified and doping method. Nitrogen doping method can change the material’s electrons and lattice structures significantly, enhance the hydrophilic, affect the surface pH. In this study, we synthesized a series of porous carbon material by zinc chloride (ZnCl2)activation method.In this paper, the carbon material’s pore structure was studied by some characterization methods, such as nitrogen adsorption-desorption isotherms, scanning electron microscopy (SEM), transmission electron microscopy (TEM),X-ray photoelectron spectroscopy (XPS)and CO2 adsorption isotherm testing.As well as the effect ofCO2 absorption propertiesby changing the amount of doping N atoms was discussed.In the second chapter, we prepared a porous carbon material using a cation exchange resin (Amberlite IRC-86) as the carbon source, ZnCl2 as the activator,hanging the calcination temperature when the cation exchange resin (Amberlite IRC-86) and ZnCl2 ratio was fixed of 1:4.The following conclusions can be draw from this experiment, adding the activation agent make the carbon material have a large number of pores, the specific surface area and the pore volume of the micro pores increased with the calcination temperature rise, as well as the adsorption properties of CO2. So this method can be used to prepare a porous carbon material successfully.Its properties are related to the material’s surface area and the volume.In the third chapter, we studied the effect of nitrogen doping on the porous carbon material byusingpolypyrrole (Ppy) as the carbon source, ZnCl2 as the activator,changing the ratio of Ppy and ZnCl2, calcination temperature. This experimental result showed that the amount of activator, calcination temperature and the amount of nitrogen dopedaffected the specific surface area, pore volume and CO2 adsorption property of the porous carbon materials greatly.Since the specific surface area which can be effectively used of the multi-walled carbon nanotubes (MWCNTs) is small, the multi-walled carbon nanotubescan’t be widely used.In the fourth chapter,the porous carbon material was preparedbypolypyrrole/multi-walled carbon nanotubes composite (MWCNTs) asthe carbon source,ZnCl2as the activator. The experimental results showed that added the pyrrole and activatormadethe specific surface area and micropore volumeof the multi walled carbon nanotubes (MWCNTs)increase greatly, the performance ofCO2 adsorption which is greatly enhanced bebetter than those materials which is nitrogen doped.This is due toCO2can take acarburization reaction with amino, imino and others containing nitrogen group which on the surface ofporous carbon materials,the CO2 adsorption properties was improved.Follow the full text, we prepared a porous carbon material with large specific surface areaand microporous bulksuccessfully,using different substances as carbon sources, ZnCl2 as activator. We controlledthe composition and structure of the porous carbon materialby changing the amount of activator, calcination temperature and nitrogen doping amount, further on improved the adsorption property of CO2.