Response surface methodological evaluation of the adsorption of textile dye onto biosilica/alginate nanobiocomposite: thermodynamic, kinetic, and isotherm studies

Soltani,, Darvishi Cheshmeh and Khataee,, A. R. and Godini,, H.) and Safari, M. and Ghanadzadeh, M. J. and Rajaei, M. S (2015) Response surface methodological evaluation of the adsorption of textile dye onto biosilica/alginate nanobiocomposite: thermodynamic, kinetic, and isotherm studies. DESALINATION AND WATER TREATMENT, 56 (5). pp. 1389-1402. ISSN 1944-3994

Full text not available from this repository.

Abstract

The present investigation was carried out to synthesize biosilica/calcium alginate (CA) nanobiocomposite and evaluate the efficiency of as-prepared adsorbent for removing Direct Blue 71 (DB71) from aqueous solutions. Response surface methodology based on central composite design was applied to optimize the process. Accordingly, the maximum color removal of 81.49% was achieved at an initial DB71 concentration of 21mg/L, adsorbent dosage of 2.4g/L, contact time of 42min and initial pH of 5. The negative values of Gibbs free energy (G degrees) and enthalpy change (H degrees), which were obtained during the thermodynamic study, revealed spontaneous and exothermic nature of the adsorption process, respectively. The adsorption of DB71 onto the nanobiocomposite followed pseudo-second-order kinetic model (R-2=0.977) and Langmuir isotherm model (R-2=0.994). The maximum adsorption capacity of biosilica/CA nanobiocomposite for the adsorption of DB71 was found to be 21.32mg/g. The value of mean free energy (12.91kJ/mol) indicated chemical adsorption of DB71 onto the adsorbent

Item Type: Article
Subjects: M Music and Books on Music > M Music
Depositing User: sobhan rezaiian
Date Deposited: 23 Oct 2017 12:03
Last Modified: 23 Oct 2017 12:03
URI: http://eprints.lums.ac.ir/id/eprint/679

Actions (login required)

View Item View Item