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A novel spherical lignin-based adsorbent, denoted as SLBA, was prepared using alkali lignin as a raw material which was provided by a masson pine pulp mill in Fujian, China. Then an investigation was conducted regarding the adsorption behavior of a reactive dye (Turquoise Blue KN-G) from aqueous solutions with the above new spherical lignin-based adsorbent containing the quaternary ammonium cationic group. Moreover, various affecting factors on the adsorption were optimized. It was found that the adsorption of reactive Turquoise Blue KN-G on the adsorbent was found to be initially pH and concentration dependent. The concentration helped to increase the equilibrium adsorption capacity. With an increase in solution pH ranging from 3 to 8, the removal percentage increased sharply from 12.3% to 98.6%, and at pH = 10, the removal rate reached 100%. The adsorption process followed the Langmuir adsorption isotherm, i.e., Ce/qe=0.0002136 + 0.001225Ce. Moreover, RL, a dimensionless separation factor of an equilibrium parameter, was 8.711 × 10, which was far less than 0.1 indicating the favorable adsorption. The saturated adsorption capacity was 816.3 mg/g, and the total breakthrough removal capacity was 761 mg/g, which prevailed over the commercial activated carbons evidently. The reactive Turquoise Blue KN-G adsorbed on SLBA could be recovered with a mixture of alcohol, dicyandiamide-formaldehyde polycondensate and HCl aqueous solutions. And, the maximum desorption efficiency could reach 98.7%.
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Acta Scientiarum Natralium Universitatis Sunyatseni
ISSN: 0529-6579
Year: 2005
Issue: SUPPL. 2
Volume: 44
Page: 1-6
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ESI Highly Cited Papers on the List: 0 Unfold All
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30 Days PV: 2
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