Adsorption of methyl parathion on PAC from natural

Authors: Jingyi Zhang Baoyou Shi Tao Li Dongsheng Wang

Publish Date: 2012/09/29

Volume: 19, Issue: 1, Pages: 91-99

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Abstract

Source water pollution by agricultural chemicals poses great threat to drinking water safety and the removal of such contaminants is a challenge to the water treatment industry In this work the adsorption behaviors of methyl parathion MP from different natural waters onto different kinds of powdered activated carbons PAC were investigated systematically On the basis of the characterization of the PACs and natural organic matter NOM the suitability of PAC with NOM for effective removal of MP was proposed and the effect of competitive adsorption on MP removal under two PAC dosing patterns was evaluated The results indicated that NOM adsorption was dependent on the molecular weight MW distribution of organic compounds and the pore size distribution of PAC The mesopore surface area with pore size3 nm was dominant for the adsorption of the NOM fraction in the range of 500 DaMW3000 Da Competition for adsorption sites by smaller MW NOM had significant effect on the adsorption of target organic compound in the simultaneous adsorption pattern Whereas in the NOMpreloaded adsorption pattern pore blockage by relatively larger MW NOM resulted in markedly reduction in both adsorption capacity and adsorption kinetics the diffusion rate of MP on PAC could be affected by the PAC dosage pore size distribution and the MW distribution of NOM

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