کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
598199 1454089 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Kinetics and isotherms of adsorption of alkyldimethylamine oxide on a porous hydrophobic polymer: A thermodynamic approach to a Langmuir-like phenomenon
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Kinetics and isotherms of adsorption of alkyldimethylamine oxide on a porous hydrophobic polymer: A thermodynamic approach to a Langmuir-like phenomenon
چکیده انگلیسی

We studied the adsorption of decyl-, dodecyl- and tetradecyldimethylamine oxide surfactants on porous beads of polystyrene divinylbenzene (Bio-beads SM2). The concentration of free surfactant is followed in situ using an ion-selective electrode. Isotherms for the three surfactants were determined using a batch method at 25 °C. We tested various parameters for their influence on the adsorption kinetics: initial surfactant concentration (below and above the critical micellar concentration (CMC)), initial quantity of bead, temperature and surfactant chain length. The behaviour can be modelled using a generalised Langmuir kinetics approach that assumes systems do not possess adsorption sites. We used the same set of parameters for the isotherm and kinetics results. These parameters are linked to the parameters from the Langmuir equation and we discuss the validity of the model. Although the proposed model does not require any adsorption sites, the results from the model are similar to the Langmuir approach. Adsorption is shown to be due to hydrophobic interactions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Colloids and Surfaces A: Physicochemical and Engineering Aspects - Volume 281, Issues 1–3, 15 June 2006, Pages 261–270
نویسندگان
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