The capacity to adsorb natural organic matter (NOM) and polystyrene sulfonates (PSSs) on small particle-size Activated Carbon (super-Powdered Activated Carbon, SPAC) powdered activated carbon water treatment is higher than that on larger particle-size Activated Carbon (Powdered–Activated Carbon, PAC). Increased adsorption capacity is likely attributable to the larger external surface area because the NOM and PSS molecules do not completely penetrate the adsorbent particle; they preferentially adsorb near the outer surface of the particle. In this study, we propose a new isotherm equation, the Shell Adsorption Model (SAM), to explain the higher adsorption capacity on smaller adsorbent particles and to describe quantitatively adsorption isotherms of Activated Carbons of different particle sizes: PAC and SPAC. The SAM was verified with the experimental data of PSS adsorption kinetics as well as equilibrium. SAM successfully characterized PSS adsorption isotherm data for SPACs and PAC simultaneously with the same model parameters. When SAM was incorporated into an adsorption kinetic model, kinetic decay curves for PSSs adsorbing onto Activated Carbons of different particle sizes could be simultaneously described with a single kinetics parameter value. On the other hand, when SAM was not incorporated into such an adsorption kinetic model and instead isotherms were described by the Freundlich model, the kinetic decay curves were not well described. The success of the SAM further supports the adsorption mechanism of PSSs preferentially adsorbing near the outer surface of activated-carbon-pellets.comActivated Carbon particles
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Activated carbon is a strong adsorbent, the adsorption of gas and adsorption capacity are very large.When the gas molecules occupy the adsorption surface of activated carbon, the adsorption of activated carbon will be reduced, resulting in the so-called "poisoning" of activated carbon.If there is oxygen on the activated carbon adsorption, sometimes also make the adsorption of the material oxidation reaction.Therefore, before the use of activated carbon, most of the gas must be removed by adsorption.Usually remove the gas in activated carbon there are two methods, one method is to use ephedrine or hydrogen sulfide saturated water solution treatment, but this treatment method is too complex, and through these treatments can also cause some other side reactions, so it is not commonly used.
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