Study on the adsorption performance of sodium benzoate on waste coal granular activated carbon from water plants
Waste activated carbon from a water plant is used as the adsorbent of sodium benzoate.Through ash,SEM and BET characterization analysis of the waste activated carbon,the surface of the waste activa-ted carbon became smooth,the iodine value was only 339.86 mg/g,and the mesoporous proportion was large,indicating that the adsorption site on the surface of the activated carbon was occupied,and its ad-sorption performance decreased.The fitting results showed that the adsorption of sodium benzoate by waste activated carbon was more consistent with Freundlich isothermal model and pseudo-second-order kinetic model.With the increase of temperature,the removal rate of sodium benzoate decreases,which is consist-ent with the negative enthalpy change of thermodynamic parameter,and belongs to exothermic reaction.The maximum adsorption capacity of waste activated carbon for sodium benzoate is 1.108 mg/g,which proves that waste activated carbon can be applied to industrial wastewater,and finds a new way for the fi-nal disposal of waste activated carbon in water plants.
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