Abstract:

In this study，PAEs (Phthalic Acid Esters) was selected to study their static adsorption characteristic on suspended particulates from the Wanzhou Reach of the Yangtze River.Several significant results were obtained from the study：the adsorption isotherms of DMP，DEHP，and DOP showed obvious “S” shape.Freundlich and Langmuir sorption isotherm could describe the sorption behaviors when the initial concentration of PAEs is bellow 500 μg/L,while Linear sorption isotherm was better when the concentration of PAEs was between 500 μg/L and 1000 μg/L.This indicated that the surface sorption played leading role when the adsorbate concentration was low and the partition strengthened gradually as the concentration grew.The adsorption quantity of suspended sediments treated by H2O2 was higher than that of suspended sediments not treated by H2O2，when the adsorption equilibrium occured.And Freundlich equation and Langmuir equation fit this adsorption isotherm better，which showed that the absorption type of treated suspended sediments was the surface absorption.Experiments showed a rapid sorption of DMP，DEHP and DOP in the Yangtze River suspended particulates in 2 hours，and the sorption equilibrium could be achieved in 12 hours.〖 〖W