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Removal of Astrazone Blue from aqueous solutions onto brown peat. Equilibrium and kinetics studies

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Abstract

The aim of this study is to characterize and assess the sorption potential of brown peat, in relation to colored pollutants from the textile industry wastewater. The objectives of this paper were: the physicochemical, morphological, and mineralogical characterization of brown peat, testing the adsorption capacity of natural and chemically treated peat samples for Astrazone Blue, evaluation of adsorption process from equilibrium isotherm and kinetic point of view. The characteristics of the peat samples were investigated using elemental analysis, scanning electron microscopy and X-ray diffractometry. Experimental data indicated that the brown peat tested confirm a high level of adsorption (removal efficiency >93.00%, adsorption capacity reaching up to 24.27 mg/g) of Astrazone Blue from aqueous solution. The Langmuir and Freundlich adsorption isotherm models were used to find the best equation able to describe the adsorption process. Experimental adsorption data were successfully described by the Langmuir equilibrium isotherm model. This fact is supported by the agreement between the q values obtained using the Langmuir equation (26.32 mg/g), and the ones obtained experimentally (24.27 mg/g). The kinetic studies showed that the pseudo-second-order model described Astrazone Blue sorption kinetics, as confirmed by the high values of R2, which are over 0.99 for the whole investigated concentration range (200 to 800 mg/L). The use of brown peat adsorbent is more advantageous compared with other materials since it does not require a preliminary treatment, is low-cost and is an eco-friendly adsorbent. Hence, this peat appears to be a viable material for the decontamination of effluents containing dyes.

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Authors and Affiliations

  1. Faculty of Engineering, Vasile Alecsandri University of Bacău, 157 Mărăşeşti Blvd., Bacău, 600115, Romania

    Lacramioara Rusu & Andrei Ionuţ Simion

  2. Faculty of Chemical Engineering and Environmental Protection, Gheorghe Asachi Technical University of Iaşi, 73 Dimitrie Mangeron Street, Iaşi, 700050, Romania

    Maria Harja, Daniela Suteu & Gabriela Ciobanu

  3. Ecole Nationale Supérieure de Chimie de Rennes, CNRS, UMR 6226, Avenue du Général Leclerc, CS 50837, 35708, Rennes Cedex 7, France

    Lidia Favier

Authors
  1. Lacramioara Rusu
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  2. Maria Harja
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  3. Andrei Ionuţ Simion
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  4. Daniela Suteu
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  5. Gabriela Ciobanu
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  6. Lidia Favier
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Correspondence to Maria Harja.

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Rusu, L., Harja, M., Simion, A.I. et al. Removal of Astrazone Blue from aqueous solutions onto brown peat. Equilibrium and kinetics studies. Korean J. Chem. Eng. 31, 1008–1015 (2014). https://doi.org/10.1007/s11814-014-0009-3

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  • DOI: https://doi.org/10.1007/s11814-014-0009-3

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