|Title:||Adsorption of SDS from greywater on CTAB and its analogues modified Na-zeolite|
|Subject:||Hong Kong Polytechnic University -- Dissertations|
Sewage -- Purification
|Department:||Faculty of Construction and Environment|
|Pages:||i, 29 leaves : color illustrations ; 30 cm|
|Abstract:||This article investigated the adsorption capacities and mechanisms on sodium dodecyl sulfate (SDS) of several different surfactant modified zeolites (SMZ). The SMZs are prepared by loading the analogues of CTAB such as HO(CH₂)₁₀N(CH₃)₃, Br(CH₂)₁₀N(CH₃)₃, (CH₃)₃N(CH₂)₁₀N(CH₃)₃. The performance of adsorbents, thermodynamics and the influence of temperature were researched in this work. Molecular level thermodynamic parameters such as Gibbs free energy, enthalpy change and entropy change were obtained from ITC test. The batch experiments show that with the same length of carbon chain, bromide group component has the best adsorption performance and hydroxyl group compound is the worst. With the same functional group (OH), compound which has longer carbon chain has better adsorption performance. These results can be proved by ITC test. At the molecular level, the Gibbs free energy of CTAB, CH₃(CH₂)₁₃N(CH₃)₃, Br(CH₂)₁₄N(CH₃)₃, HO(CH₂)₁₄N(CH₃)₃ with SDS are -7.81,-7.48, -7.15, 1.98 Kcal/mol separately. Apparently, CTAB is the most likely to combine with SDS and Br(CH₂)₁₄N(CH₃)₃ is also easy to react with a very close ΔG. As for the inorganic components such as sulfate and phosphate, their influence on modification process is negligible according to the ITC test.|
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