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Journal
2008 | 6 | 2 | 258-266
Article title

Removal of reactive dye brilliant red HE-3B from aqueous solutions by hydrolyzed polyacrylonitrile fibres: equilibrium and kinetics modelling

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EN
Abstracts
EN
A cheap and efficient fibrous hydrolyzed polyacrylonitrile (HPAN) sorbent was obtained by alkaline hydrolysis of Romanian polyacrylonitrile fibres. Scanning electronic microscopy and infrared spectroscopy were used to characterize the hydrolyzed product and to confirm its functionalization. The adsorptive potential of the proposed sorbent for reactive dye Brilliant Red HE-3B removal from aqueous solutions of pH=2 was examined by the batch technique as a function of dye concentration, temperature solution and contact time. The Freundlich, Langmuir and Dubinin-Radushkevich adsorption models were applied to describe equilibrium sorption data and to determine the corresponding isotherm constants. The thermodynamic parameters ΔG, ΔH and ΔS were also determined; the values obtained show that sorption of reactive dye on HPAN fibres is a spontaneous, endothermic and entropy-driven process. The kinetics of sorption of the reactive dye were analyzed using pseudo-first order and pseudo-second order kinetic models. The kinetic data fitted well to pseudo-second order kinetics, indicating the chemisorption of reactive dye onto the fibrous sorbent. The sorption mechanism of the dye onto hydrolyzed fibres was confirmed by FTIR spectroscopy. The dye-loaded HPAN sorbent can be regenerated by treatment with 0.1M NaOH and the regenerated sorbent may be reused in several adsorption-desorption cycles. The results of this study provided evidence that the HPAN fibres are effective for removing reactive dye Brilliant Red HE-3B from aqueous effluents. [...]
Publisher

Journal
Year
Volume
6
Issue
2
Pages
258-266
Physical description
Dates
published
1 - 6 - 2008
online
17 - 4 - 2008
Contributors
author
  • Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, Technical University “Gh.Asachi”, 700050, Iasi, Romania
author
  • Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection, Technical University “Gh.Asachi”, 700050, Iasi, Romania, danasuteu67@yahoo.com
  • Department of Natural and Synthetic Polymers, Faculty of Chemical Engineering and Environmental Protection, Technical University “Gh.Asachi”, 700050, Iasi, Romania
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11532-008-0019-2
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