A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic Tuff
In this study, the kinetics of adsorption of humic acid (HA) from aqueous solution onto a zeolitic tuff were investigated. X-ray diffraction, scanning electron microscopy, porosity and pore-size distribution measurements indicate that macromolecules can diffuse into the material. The kinetic curves...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2013-04-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.31.4.373 |
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| author | Luigi Ambrosone Silvana Canzano Pasquale Iovino Stefano Salvestrini Sante Capasso Carmine Colella |
| author_facet | Luigi Ambrosone Silvana Canzano Pasquale Iovino Stefano Salvestrini Sante Capasso Carmine Colella |
| author_sort | Luigi Ambrosone |
| collection | DOAJ |
| description | In this study, the kinetics of adsorption of humic acid (HA) from aqueous solution onto a zeolitic tuff were investigated. X-ray diffraction, scanning electron microscopy, porosity and pore-size distribution measurements indicate that macromolecules can diffuse into the material. The kinetic curves show a two-stage adsorption. The adsorbed amount increases up to 2 days, remains constant and then increases again to attain equilibrium. There is a remarkable similarity between this adsorption behaviour of HA on zeolitic tuff and the behaviour observed when ultrathin multi-layers of polymeric materials are fabricated by self-assembly technique. Experiments reveal two distinct stages: the first corresponds to the macromolecules being driven towards the substrate, while the second is the result of arrangement of macromolecules. The first stage is a first-order kinetics with characteristic lifetime of 1–2 days, whereas the second stage is a Johnson–Mehl–Avrami function with (t m ) in the exponential and slower characteristic lifetime. |
| format | Article |
| id | doaj-art-0e658f1a31094e43ba3deaa7d167701c |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2013-04-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-0e658f1a31094e43ba3deaa7d167701c2025-01-03T00:10:31ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382013-04-013110.1260/0263-6174.31.4.373A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic TuffLuigi Ambrosone0Silvana Canzano1Pasquale Iovino2Stefano Salvestrini3Sante Capasso4Carmine Colella5 Consorzio Interuniversitario per lo sviluppo dei Sistemi a Grande Interfase (CSGI-Firenze) c/o Department of Bioscience and Territory (DIBT), Molise University, Contrada Conte Lappone Pesche, 86090 Isernia, Italy Consorzio Interuniversitario Nazionale La Chimica per l'Ambiente, c/o Department of Environmental Science, Seconda Università di Napoli, via Vivaldi, 43, 81100 Caserta, Italy Consorzio Interuniversitario Nazionale La Chimica per l'Ambiente, c/o Department of Environmental Science, Seconda Università di Napoli, via Vivaldi, 43, 81100 Caserta, Italy Consorzio Interuniversitario Nazionale La Chimica per l'Ambiente, c/o Department of Environmental Science, Seconda Università di Napoli, via Vivaldi, 43, 81100 Caserta, Italy Consorzio Interuniversitario Nazionale La Chimica per l'Ambiente, c/o Department of Environmental Science, Seconda Università di Napoli, via Vivaldi, 43, 81100 Caserta, Italy Department of Materials Engineering and Production, Università Federico II, Napoli, ItalyIn this study, the kinetics of adsorption of humic acid (HA) from aqueous solution onto a zeolitic tuff were investigated. X-ray diffraction, scanning electron microscopy, porosity and pore-size distribution measurements indicate that macromolecules can diffuse into the material. The kinetic curves show a two-stage adsorption. The adsorbed amount increases up to 2 days, remains constant and then increases again to attain equilibrium. There is a remarkable similarity between this adsorption behaviour of HA on zeolitic tuff and the behaviour observed when ultrathin multi-layers of polymeric materials are fabricated by self-assembly technique. Experiments reveal two distinct stages: the first corresponds to the macromolecules being driven towards the substrate, while the second is the result of arrangement of macromolecules. The first stage is a first-order kinetics with characteristic lifetime of 1–2 days, whereas the second stage is a Johnson–Mehl–Avrami function with (t m ) in the exponential and slower characteristic lifetime.https://doi.org/10.1260/0263-6174.31.4.373 |
| spellingShingle | Luigi Ambrosone Silvana Canzano Pasquale Iovino Stefano Salvestrini Sante Capasso Carmine Colella A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic Tuff Adsorption Science & Technology |
| title | A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic Tuff |
| title_full | A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic Tuff |
| title_fullStr | A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic Tuff |
| title_full_unstemmed | A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic Tuff |
| title_short | A Phenomenological Interpretation of Two-Step Adsorption Kinetics of Humic Acids on Zeolitic Tuff |
| title_sort | phenomenological interpretation of two step adsorption kinetics of humic acids on zeolitic tuff |
| url | https://doi.org/10.1260/0263-6174.31.4.373 |
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