Anionic functionalized monolithic macro-porous polymers were used for the removal of hexavalent chromium(VI) anions from aqueous solution in column experiments. At a flux of 1.0 cm min and 30 mg Cr(VI) L−1 feed concentration, breakthrough capacity and apparent capacity were 0.066 g Cr(VI) g−1 anionic monolith and 0.144 g Cr(VI) g−1 anionic monolith, respectively. The degree of column utilization was found to lie in the range 41–46%. Two kinetic models, theoretical and Thomas models, were applied to experimental data to predict the breakthrough curves and to determine the characteristic parameters of the column useful for process design. The simulation of the whole breakthrough curve was effective with the models. At a flux of 1.0 cm min and 30 mg Cr(VI) L−1 feed concentration, the dispersion coefficient and adsorption equilibrium constant (K) were 3.14 × 10−7 m s−1 and 3,840, respectively. Also, Thomas model parameters k1 (rate constant of adsorption) and qm (equilibrium solid-phase concentration of sorbed solute) were 1.08 × 10−3 L mg−1 min−1 and 0.124 g g−1, respectively. After reaching equilibrium adsorption capacity, the monoliths were regenerated using 1 N HCl and were subsequently re-tested. It was found that the regeneration efficiency reduced from 98% after second usage to 97% after the third usage.
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Research Article|
November 27 2015
Hexavalent chromium removal performance of anionic functionalized monolithic polymers: column adsorption, regeneration and modelling Available to Purchase
Necla Barlik;
1Department of Environmental Engineering, Engineering Faculty, Atatürk University, 25240 Erzurum, Turkey Present address: Department of Environmental Engineering, Engineering Faculty, Ardahan University, 75000 Ardahan, Turkey
E-mail: [email protected]
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Bülent Keskinler;
Bülent Keskinler
2Department of Environmental Engineering, Engineering Faculty, Gebze Technical University, 41400 Gebze Kocaeli, Turkey
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M. Muhtar Kocakerim
M. Muhtar Kocakerim
3Department of Chemical Engineering, Engineering Faculty, Çankırı Karatekin University, 18000 Çankırı, Turkey
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Water Sci Technol (2016) 73 (6): 1279–1286.
Article history
Received:
April 28 2015
Accepted:
November 12 2015
Citation
Necla Barlik, Bülent Keskinler, M. Muhtar Kocakerim; Hexavalent chromium removal performance of anionic functionalized monolithic polymers: column adsorption, regeneration and modelling. Water Sci Technol 22 March 2016; 73 (6): 1279–1286. doi: https://doi.org/10.2166/wst.2015.602
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