Adsorption isotherms of non-ionic surfactants on Na-bentonite (Iran) and evaluation of thermodynamic parameters
作者： M. Ghiaci , R.J. Kalbasi , A. Abbaspour
DOI: 10.1016/J.COLSURFA.2006.10.032
关键词: Freundlich equation 、 Thermodynamics 、 Adsorption 、 Sorption 、 Gibbs free energy 、 Pulmonary surfactant 、 Enthalpy 、 Bentonite 、 Chemistry 、 Langmuir 、 Colloid and Surface Chemistry
摘要: Abstract Non-ionic surfactants have been adsorbed on bentonite (Iran) as a relatively good adsorbent in various temperatures (297–323 K). The experimental data obtained from non-ionic fitted into the adsorption isotherm equations such as: Langmuir , Freundlich – ( Modified ), Hill Redlich Peterson BET Halsey Harkins Jura Smith Henderson Chaung - Pfost Oswin and some modified forms of these isotherms, their goodness fit compared. In addition, has i sotherm which considers dependency sorption temperature. correlation coefficient r 2 ) by fitting to isotherms favorably high. thermodynamic Gibbs free energy (Δ G °), enthalpy H °) entropy S terms determined for surfactant adsorption; negative values Δ ° indicates that process is spontaneous one. Finally, intercalation interlamellar space was followed X-ray measurements.
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