کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
177304 458976 2011 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
An investigation of the kinetics and thermodynamics of the adsorption of a cationic cobalt porphyrazine onto sepiolite
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
پیش نمایش صفحه اول مقاله
An investigation of the kinetics and thermodynamics of the adsorption of a cationic cobalt porphyrazine onto sepiolite
چکیده انگلیسی

The adsorption of [octakis(2-trimethylammoniumethylsulfanyl)-porphyrazinatocobalt]octaiodide from aqueous solution onto negatively charged sepiolite is investigated. The effects of temperature, dye and solid concentration and contact time on adsorption were evaluated. Adsorption experiments were analyzed in the light of zeta potential measurements and desorption behavior of the dye–sepiolite composite. Experimental data were analyzed using four adsorption kinetic models, of which a pseudo-second-order kinetic model was found to be superior. Experimental equilibrium data were fitted to five adsorption isotherm models, from which the free energy, enthalpy and entropy of the adsorption processes were determined. Adsorption onto sepiolite was exothermic and spontaneous. AAS and FTIR were used to elucidate the adsorption mechanism. The novel composite is considered to be useful in optical and catalytic applications.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Dyes and Pigments - Volume 88, Issue 1, January 2011, Pages 25–38
نویسندگان
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