Elimination de micropolluants par adsorption sur charbon actif dans l'eau: cas d'un tensioactif non ionique; influence de co-adsorbats removal of non ionic surfactant from water onto activated carbon, influence of organic compounds

Abstract

Adsorption of organic micropollutants on activated carbon is nowadays an integral part of most advanced water and wastewater purification systems. Equilibria and capacity relationships for monocomponent systems are well established and quantitatively expressed by the Langmuir or Freundlich isotherms. The results of the adsorption of a nonionic surfactant: CH 3(CH 2) 8C 6H 4O (CH 2CH 2O) 7CH 2CH 2OH (NP8) have been determined for micromolar concentration range. Using Langmuir and Derylo-Jaroniec equations, the ultimate capacity, the equilibrium constant and energetic parameters can be deduced. Influence of co-adsorbates are tested: linear and ramified alcohols (C 2 to C 5) anionic surfactant CH 3(CH 2) 11 SO 14Na (DSS); the experimental results of adsorption are compared with those obtained by using two bi-solute systems ( Jain and Snoeyink, 1973; Derylo-Jaroniec, 1982) and discussed in terms of competition, inhibition or promotion of the adsorption of co-adsorbates on the carbon sites.