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Sorption of humic acids by a zeolite-feldspar-bearing tuff in batch and fixed-bed column

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Abstract

The sorption of humic acids (HA) on zeolite-feldspar-bearing Phlegraean Yellow Tuff enriched with calcium ions has been investigated at neutral pH both on fixed-bed columns and in batch. A two-step sorption kinetics and a relatively long time to reach the equilibrium were observed in batch. In line with this behaviour, the breakthrough curves and shipping curves from exhaust columns showed distinctive properties that cannot be easily modelled by the common mass balance equations; noteworthy, the breakthrough curves were dependent on the space velocity also for very slow processes and the bed sorption capacity decreased linearly with the space velocity. Moreover, after an initial high-rate burst, HA desorption from exhausted columns proceeded at a very slow rate, particularly so for columns loaded with higher amounts of HA.

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Authors and Affiliations

  1. Dipartimento di Scienze Ambientali, Seconda Università degli Studi di Napoli, via Vivaldi 43, 81100, Caserta, Italy

    Vincenzo Leone, Silvana Canzano, Pasquale Iovino & Sante Capasso

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  1. Vincenzo Leone
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  2. Silvana Canzano
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  3. Pasquale Iovino
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  4. Sante Capasso
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Correspondence to Sante Capasso.

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Leone, V., Canzano, S., Iovino, P. et al. Sorption of humic acids by a zeolite-feldspar-bearing tuff in batch and fixed-bed column. J Porous Mater 19, 449–453 (2012). https://doi.org/10.1007/s10934-011-9493-6

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  • DOI: https://doi.org/10.1007/s10934-011-9493-6

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