Thermodynamics and adsorption studies of dye (rhodamine-b) onto natural diatomite

• Autorzy: Koyuncu M. , Kul A. R.

Identyfikatory

DOI

10.5277/ppmp140217

• Języki publikacji: EN

Abstrakty

EN

Thermodynamics and adsorption studies were conducted with a dye of rhodamine-B on natural diatomite. Adsorption of the dye was investigated with an initial dye concentration at pH 8±0.2, 303, 313 and 323 K. The adsorption experiments were carried out isothermally at three different temperatures. The Langmuir and Freundlich isotherm models were used to describe the equilibrium data and the results were discussed in details. The kinetic data agreed with the pseudo-first order model with rate constants (k2) in the range of 3.05–1.59.10–1 g/mg min. The thermodynamic parameters such as standard free energy, entropy change and enthalpy were calculated for natural diatomite. These values showed that adsorption of rhodamine-B on natural diatomite was a spontaneous and endothermic process.

Słowa kluczowe

EN

diatomite; rhodamine B; adsorption; thermodynamics; Langmuir isotherm; Freundlich isotherm

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2014
• Tom: Vol. 50, iss. 2
• Strony: 631--643
• Opis fizyczny: Bibliogr. 43 poz., rys., tab.

Twórcy

autor

Koyuncu M.

• Department of Textile, Van Vocational School, Yuzuncu Yil University, Van, Turkey

autor

Kul A. R.

• Department of Chemistry, Science Faculty, Yuzuncu Yil University, Van, Turkey

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