Modification of red soil with surfactant to promote the adsorption of p,p’-DDE from water

摘要

In this paper, we studied the efficiency of the synthetic organo-red soil (OS) modified with threesurfactants (Cetyltrimethylammonium Bromide (CTMAB), Sodium Dodecyl Benzenesulfonate (SDBS) andPolyethylene Glycol-4000 (PEG-4000)) for the removal of the p,p’-dichlorodiphenyldichloroethylene(p,p’-DDE) from contaminated water. The results demonstrated that the adsorption behavior dependedgreatly on the type and concentration of surfactant and the hydrophobic properties of the pesticides.Examination using BET surface area and TOC measurements revealed that surfactants increased the surfacearea of OS and replaced hydrophobic with hydrophilic on the OS surface. The adsorption efficiency of redsoil for the pesticides followed the order：OSY>OSF>OSYI>OSN. According to the value of R2, it can beconcluded that the best fit for the experimental adsorption data were given by the Redlich-Peterson modeland homogeneous particle diffusion model.