The granular of activated carbon has a very good removal effect for less than the molecular weight below 480 extractable organic matters, and the removal efficiency is very low for macromolecular organic matters. This is mainly because the micro-porous structure of the activated carbon, too large organic molecules cannot into the pores of the internal activity carbon, only adsorption in activated carbon surface.
Comparing the adsorption effect of volatile carbon and organic compounds on activated carbon, we draw the conclusion:
Activated carbon has a big difference in adsorption for volatile organic compounds and extraction of organic compounds. Volatile organic compounds with the molecular weight increased, the adsorption effect is better; and the extraction of organic compounds reduce with molecular weight, the adsorption effect is better. This is mainly due to volatile organic compounds mainly polar is the small organic matter, and the extractable organic matter is the relatively large polarity of organic matter. Activated carbon itself can be seen as a non-polar adsorbent for water adsorption capacity of nonpolar substances, which is greater than the adsorption capacity of polar compounds. Moreover, the adsorbate molecule size and activated carbon in a certain proportion, which is the most conducive to the adsorption. For small polar molecules, the larger of the molecular weight, the more conducive to the adsorption.