ADSORPTION CHARBON ACTIF THESES EN PDF

If a sudden pollution incident occurs, powdered activated carbon PAC is used during the flocculation step of water treatment; under such circumstances, atrazine might be in adsorption competition with surfactants included in commercial formulations. The aim of this study was thus to determine the influence of three surfactants [anionic sodium dodecylsulphate, SDS , cationic hexadecyl-trimethylammonium bromide, HTAB and nonionic 2-dodecyloxy-pentaethanoxy -ethanol, DE6 ] on atrazine adsorption onto PAC. At pH 5. However, when the pH was increased 3. In contrast, for the same experimental conditions but with the cationic surfactant HTAB, adsorption of the surfactant increased over the pH range 3. The nonionic surfactant DE6 had no influence.

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If a sudden pollution incident occurs, powdered activated carbon PAC is used during the flocculation step of water treatment; under such circumstances, atrazine might be in adsorption competition with surfactants included in commercial formulations. The aim of this study was thus to determine the influence of three surfactants [anionic sodium dodecylsulphate, SDS , cationic hexadecyl-trimethylammonium bromide, HTAB and nonionic 2-dodecyloxy-pentaethanoxy -ethanol, DE6 ] on atrazine adsorption onto PAC.

At pH 5. However, when the pH was increased 3. In contrast, for the same experimental conditions but with the cationic surfactant HTAB, adsorption of the surfactant increased over the pH range 3. The nonionic surfactant DE6 had no influence. A study of the introduction order of the different components atrazine, SDS surfactant and PAC showed the same final equilibrium distribution of atrazine was obtained fig. A similar result was obtained for the adsorption of SDS fig.

For all these cases, the Langmuir equation yielded the adsorption capacity for atrazine and the equilibrium constant. However, competitive and noncompetitive adsorption models table 1 were unsuccessful in predicting the nature of the interactions between atrazine and the surfactants table 5.

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Kazraktilar Molecules are adsorbed and immobilized onto sites of different energies They do, however, have some interactions with other adsorbed molecules. The interactions between this solution and the solid were characterized by several methods: Langmuir and Freundlich parameters for the adsorption of the basicred dye on sawdust. The limiting step is the diffusion through a film at the start of the reaction, which is followed by the diffusion-adsorption into the porous structure in a region close to equilibrium. The linearized Clark equation 16 gives a good representation of experimental results fig. This modification depends on the nature and pressure of the gas used.

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