Research of the Adsorption Properties of Pesticides and DL-PCBs on Activated Carbons

Abstract

We researched the adsorption properties of 36 agrichemicals and 14 dioxin-like polychlorinated biphenyls (DL-PCBs) on activated carbons. We examined the adsorption ratio of substrates on activated carbons, and then the influences of chemical structure of substrate, pore structure of activated carbon, and solvent effect for adsorption were studied. These experiments revealed that the substrates having not just higher logPow value than 3 but also aromatic ring with sterically-unhindered substituent groups in its chemical structure showed high adsorption property on activated carbons. It was found that the activated carbon which had the large surface area of micro pores in the diameter of around 0.7-0.8 nm and low functional groups on activated carbon surface, had the high adsorption capacity for substrates. It also became clear that solvent polarity greatly affected to the adsorption proparties and high adsorption ratio were observed in the case of water solution for all substrates.