The Study Of Removal The Basic Nitrogen Compounds In CGO With Adsorption Method

Activated carbon is an excellent adsorbent, are widely used in pharmaceutical, chemical, environmental protection, metallurgy and petroleum refining industry decolorization, deodorization, removing impurity separation. Camellia shell contains a large number of lignin has unique physical structure, is a good raw material for production of activated carbon.This project adopts the reduced pressure (vacuum) and chemical activation of specific surface area and total pore volume of prepared activated carbon with high vacuum combined with chemical activation method is used to the preparation of high quality activated carbon.Vacuum chemical activation is the improvement on traditional chemical activation method, it can effectively reduce volatile produced by the pyrolysis of the secondary cracking, increase the specific surface area and adsorption capacity of activated carbon. Compared with atmospheric pressure condition, the stress cracking under the condition of the preparation of activated carbon, with lower the temperature in the raw material of carbon, and the advantages of clean production, is of great significance for energy saving, environmental protection.Camellia fruit shell as raw material, using zinc chloride as activator, thermal cracking under vacuum conditions in the preparation of activated carbon. By measuring iodine adsorption and methylene blue adsorption, discusses the system pressure, activation time, activation temperature and impregnation ratio of operating conditions on the properties of activated carbon adsorption effect; By BET, HK equation, BJH equation and DFT theory for its specific surface area and pore structure were characterized using scanning electron microscopy (sem), infrared spectra analysis oleifera shells microstructure and surface functional groups of preparation of activated carbon. Experimental results show that the system pressure of50kPa, the heating rate of5℃/min, carbonized4hours under150℃, and the heating rate of10℃/min, at450℃for1hour activation, preparation of activated carbon iodine adsorption value, methylene blue adsorption value is1120mg/g, respectively373.16mg/g, specific surface area of2023.15m2/g, total pore volume of2.34cm3/g, the average pore size of4.63nm, decompression, the conditions for the preparation of activated carbon with excellent adsorption properties.Paper also discusses the system pressure, activation temperature and activation time, agent than oleifera nut shell activated carbon for benzothiophene adsorption performance influence. The preparation of vacuum differential nut shell activated carbon for benzothiophene adsorption kinetics, adsorption isotherm and thermodynamic features. Results show that the system is a50kPa pressure, carbonized4hours under150℃,450℃for1hour activation, preparation of activated carbon desulfurization rate can reach68.94%. Quasi secondary dynamic equation can better describe two benzothiophene on activated carbon adsorption dynamics behavior, the correlation coefficient is greater than0.999, the Freundlich adsorption isotherm model can better describe the whole process of adsorption, adsorption of preferential adsorption. Adsorption thermodynamics indicates that△H0>0activated carbon adsorption of benzene and thiophene two as the endothermic reaction, adsorption gibbs free energy△G0value is negative, indicates that the reaction is spontaneous process.Paper also discussed the atmospheric conditions of the preparation of activated carbon, modified by potassium permanganate for modification conditions and the conditions of adsorption of activated carbon were studied, the experiment showed that the best process conditions for modification:oxidation time2h, potassium permanganate concentration0.05mol/L, oxidation temperature of75℃. Of the modified activated carbon is modified on the water before the removal rate of50mg/L Cu2+ions is greatly improved, the removal rate of99%above, among them, the concentration of potassium permanganate larger effect on the Cu2+adsorption performance. Modified by potassium permanganate oil-tea nut shell activated carbon treatment concentration of50mg/L of the simulated conditions of wastewater containing copper for activated carbon dosage is0.4g, adsorption time of5h, under this condition, using potassium permanganate concentration is0.05mol/L modification of activated carbon for the adsorption of Cu2+rate above99%.