Experiments were carried out to study the adsorption of erythromycin(EM) in aqueous solutions on macroporous resins. The adsorption equilibrium characteristics of three types of macroporous resins, XAD7HP,XAD16 and HZ...Experiments were carried out to study the adsorption of erythromycin(EM) in aqueous solutions on macroporous resins. The adsorption equilibrium characteristics of three types of macroporous resins, XAD7HP,XAD16 and HZ816 were evaluated. The adsorption data were correlated with the Freundlich isotherm equation. The correlation results were in good agreement with experimental data. Thermodynamic calculation and analysis showed that the process of adsorption of EM was an endothermic physical process. The entropy of the system increased in the course of adsorption.展开更多
The effect of thermal oxidation of activated carbon surface on its adsorption of dibenzothiophene was investigated.The surface oxidation of the activated carbon was carried out by heating at different temperatures in ...The effect of thermal oxidation of activated carbon surface on its adsorption of dibenzothiophene was investigated.The surface oxidation of the activated carbon was carried out by heating at different temperatures in the air.Static equilibrium adsorption experiments were conducted to determine the isotherms of dibenzothiophene on the original and oxidized activated carbons.The type and concentration of oxygen functional groups on the activated carbons were determined by diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and Boehm titration respectively.The influence of the surface chemistry of the activated carbons on the adsorption capacity for dibenzothiophene was discussed.The results showed that the acid oxygen-containing groups of the activated carbon surfaces played an important role in enhancing the adsorption of dibenzothiophene.It was shown that the use of thermal oxidation could increase the concentration of oxygen-containing groups on the activated carbon surfaces,and consequently increase its adsorption capacity for dibenzothiophene.It was also found that the higher the oxidation temperature,the more the oxygen-containing groups on activated carbon surface,which enhanced the adsorption capacity of dibenzothiophene on its surfaces.The Langmuir equation was shown to fit well these isotherms.展开更多
文摘Experiments were carried out to study the adsorption of erythromycin(EM) in aqueous solutions on macroporous resins. The adsorption equilibrium characteristics of three types of macroporous resins, XAD7HP,XAD16 and HZ816 were evaluated. The adsorption data were correlated with the Freundlich isotherm equation. The correlation results were in good agreement with experimental data. Thermodynamic calculation and analysis showed that the process of adsorption of EM was an endothermic physical process. The entropy of the system increased in the course of adsorption.
文摘The effect of thermal oxidation of activated carbon surface on its adsorption of dibenzothiophene was investigated.The surface oxidation of the activated carbon was carried out by heating at different temperatures in the air.Static equilibrium adsorption experiments were conducted to determine the isotherms of dibenzothiophene on the original and oxidized activated carbons.The type and concentration of oxygen functional groups on the activated carbons were determined by diffuse reflectance infrared Fourier transform spectroscopy(DRIFTS)and Boehm titration respectively.The influence of the surface chemistry of the activated carbons on the adsorption capacity for dibenzothiophene was discussed.The results showed that the acid oxygen-containing groups of the activated carbon surfaces played an important role in enhancing the adsorption of dibenzothiophene.It was shown that the use of thermal oxidation could increase the concentration of oxygen-containing groups on the activated carbon surfaces,and consequently increase its adsorption capacity for dibenzothiophene.It was also found that the higher the oxidation temperature,the more the oxygen-containing groups on activated carbon surface,which enhanced the adsorption capacity of dibenzothiophene on its surfaces.The Langmuir equation was shown to fit well these isotherms.
