Research on the Influence of Humidity on the Adsorption of Ammonia by Activated Carbon
Activated carbon is an effective material for removing ammonia,and the adsorption performance of activated carbon prepared from different raw materials varies greatly,and humidity has a significant impact on the adsorption performance of activated carbon.This experiment studies the ammonia removal efficiency of three types of activated carbon under different humidity levels,and investigates the effects of initial concentration,flow rate,and temperature under optimal intake humidity on the ammonia adsorption performance of coconut shell activated carbon,in order to provide reference for the engineering application of activated carbon.Research has found that the optimal humidity for three types of activated carbon to adsorb ammonia is 50%;coconut shell activated carbon has multiple microporous structures,a large specific surface area,and a large number of oxygen-containing functional groups on the surface,which is conducive to the adsorption of ammonia;when the humidity is low,the water film is not sufficient to form and the adsorption effect is poor;when the humidity is high,the pore structure is easily blocked,and water molecules preferentially form hydrogen bonds on the surface of activated carbon,competing with ammonia molecules to occupy the active sites on the surface of activated carbon,resulting in poor ammonia adsorption;activated carbon is more suitable for treating low-temperature waste gas sources with low concentration and small flow rate.
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