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Glyphosate adsorption by ferric supported active carbon

XIE Ming,XU Yan-hua(College of Environment,Nanjing University of Technology,Nanjing 210009,China).  
Ferric supported active carbon was prepared by impregnation-calcination method and the characteristics of its surface were investigated by scanning electron magnification(SEM),and both adsorption isotherm and adsorption kinetics of Fe-AC were studied.The effects of different factors on the adsorption process were also studied.Freundlich equation fitted well to supported ferric active carbon adsorption isotherm,the maximum adsorption capacity was 5.8mmol/g;and the adsorption kinetics was fitted well by Lagergren equation,so adsorption rate constant can be calculated out 0.088min-1 that can decrease with the temperature increase.According to Kannan Sundaram internal diffusion model,the internal diffusion constant was higher than 10mg·min-1/2/g,which decreased with the temperature increase.Due to the ionization form of glyphosate and the change of Fe-AC surface characteristics,the adsorption capacity of glyphosate decreased when the pH of solution increased.Antagonistic effect caused the adsorption capacity decrease of Fe-AC due to the existence of NaCl,and when the concentration of NaCl reached 4g/L,salting-out effect became dominant,which increased the adsorption capacity slightly.Because of the steric hindrance of glyphosate and the complex formation between phosphate and supported ferric active carbon surface,the Fe-AC adsorption capacity decreased continuously while the concentration of phosphate increase.
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