Adsorption of Odorous Compound Haloanisoles by Activated Carbon

Abstract:

Five types of commonly used granular activated carbon （coconut shell pickling， coconut shell water washing， coal， fruit shell， wood activated carbon） were selected to study the adsorption isotherm and adsorption kinetics of 2，4，6-trichloroanisole （2，4，6-TCA ） and 2，4，6-tribromoanisole（2，4，6-TBA ）.Results show that all the used activated carbon can effectively adsorb halogenated anisole and the adsorption isotherms are well fitted to Freundlich model （R²>0.97）. The fruit shell activated carbon and coconut shell activated carbon performe better. Fruit shell activated carbon has the maximum adsorption capacity（K_F） for 2，4，6-TCA， while coconut shell pickling activated carbon possesses the maximum K_F for 2，4，6-TBA . The adsorption processes are consistent with the pseudo-second-order kinetics model （R²>0.97）. The adsorption rate of 2，4，6-TCA on coconut shell washing activated carbon is the fastest， and the adsorption rate of 2，4，6-TBA on pickled coconut shell activated carbon is the fastest. The adsorption mechanism and main influencing factors of coconut shell pickling activated carbon are studied. The results show that the internal diffusion is the main rate-limiting step， chemical adsorption is the main adsorption mechanism， and the concentration of initial substrate and dissolved organic matter have a great influence on the adsorption efficiency.

Key words:drinking water;haloanisoles;odor;activated carbon;adsorption