7916

7364

كارشناسي ارشد

شيمي فيزيك

اصفهان: دانشگاه صنعتي اصفهان، دانشكده شيمي

1391

سيزده،63ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

محمود تبريزچي

حسين فرخ پور

9/6/92

بيژن نجفي، محمد ژياني

شيمي

ID7364

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

65 Kinetics and Thermodynamics Study of Sodium Laurel Sulfate Adsorption on Al Surface by Ion Mobility Spectrometry Saeid Askari Varnosfaderani s askarivarnosfaderani@ch iut ac ir Jan 2013 Department of Chemistry Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisors Mahmoud Tabrizchi m tabriz@cc iut ac ir Abstract Sodium Laurel sulfate SLS is an important anionic surfactant used in many detergent products It is adsorbed on the surface of dishes during the process of cleaning In this project the kinetics and thermodynamics of adsorption of SLS on aluminum surface were studied by using an ion mobility spectrometry IMS as detector In this method aluminum surface was put in contact with the solution of SLS After drying the adsorbed SLS was measured by thermal desorption IMS To study the kinetics of adsorption aluminum surface was put in an SLS solution with defined concentration for a given time Simple Langmuir model was used to obtain kinetics properties of SLS adsorption We found that a simple model would not describe the data The time profile of the adsorption was a convolution of a fast and a slow rising exponential function Thus the kinetics of adsorption of SLS on Al surface best fitted to a two sites model In this model two different sites with different adsorption rate constants k1 and k2 were considered k2 corresponds the to sites that are more kinetically favored for SLS adsorption and k1 corresponds to sites that less appropriate for adsorption The desorption process was also studied by contacting saturated surface with pure water for given times The desorption kinetics data also indicated that two different sites were involved Microscopic image confirmed micelle formation in some parts of the surface The effect of temperature on desorption reached the conclusion that temperature causes the desorption rate to be increased The adsorption isotherm was also studied and revealed that SLS followed a multi region model The experimental data fitted into the Langmuir isotherm and the enthalpy of adsorption was calculated through van t Hoff equation The adsorption enthalpy was obtained to be 2 19 kJ mol Keywords Sodium Laurel Sulfate Surfactant Aluminum Ion Mobility AdsorptionPDF created with pdfFactory trial version www pdffactory com

محمود تبريزچي

حسين فرخ پور

بيژن نجفي، محمد ژياني