Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite
Metakaolin zeolite-A was synthesized from thermally activated kaolin clay and characterized by Fourier Transform Infrared Spectroscopy and X-Ray Diffraction Spectroscopy. The effects of pH (2–10), contact time (10–180 min), initial concentration (5–120 mgL−1), and dosage (0.1–2 g) and their interact...
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| Format: | Article |
| Language: | English |
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Wiley
2017-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2017/7025073 |
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| author | Upenyu Guyo Lycenter Yard Phiri Fidelis Chigondo |
| author_facet | Upenyu Guyo Lycenter Yard Phiri Fidelis Chigondo |
| author_sort | Upenyu Guyo |
| collection | DOAJ |
| description | Metakaolin zeolite-A was synthesized from thermally activated kaolin clay and characterized by Fourier Transform Infrared Spectroscopy and X-Ray Diffraction Spectroscopy. The effects of pH (2–10), contact time (10–180 min), initial concentration (5–120 mgL−1), and dosage (0.1–2 g) and their interactions were investigated using response surface methodology following a central composite design. Optimum removal (87.70%) was obtained at pH 6, contact time 180 min, initial concentration 40.0 mgL−1, and adsorbent dosage 1.0 g by Excel Solver using the GRG solving method. The adsorption data fitted best to the Langmuir model with correlation coefficient R2=0.993 and Chi-square value χ2=4.76. The Freundlich isotherm gave a correlation coefficient R2=0.933 and χ2=37.91. The adsorption process followed the pseudo-second-order model. The calculated thermodynamic parameters showed that the adsorption process was endothermic and not thermodynamically spontaneous. The studied zeolite-A can therefore be used as a promising adsorbent for the removal of Ca(II) ions from aqueous solutions. |
| format | Article |
| id | doaj-art-87084de887724e758eac52cff22a6d43 |
| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2017-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-87084de887724e758eac52cff22a6d432025-08-20T03:37:57ZengWileyJournal of Chemistry2090-90632090-90712017-01-01201710.1155/2017/70250737025073Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin ZeoliteUpenyu Guyo0Lycenter Yard Phiri1Fidelis Chigondo2Department of Chemical Technology, Midlands State University, Private Bag 9055, Senga, Gweru, ZimbabweDepartment of Chemical Technology, Midlands State University, Private Bag 9055, Senga, Gweru, ZimbabweDepartment of Chemical Technology, Midlands State University, Private Bag 9055, Senga, Gweru, ZimbabweMetakaolin zeolite-A was synthesized from thermally activated kaolin clay and characterized by Fourier Transform Infrared Spectroscopy and X-Ray Diffraction Spectroscopy. The effects of pH (2–10), contact time (10–180 min), initial concentration (5–120 mgL−1), and dosage (0.1–2 g) and their interactions were investigated using response surface methodology following a central composite design. Optimum removal (87.70%) was obtained at pH 6, contact time 180 min, initial concentration 40.0 mgL−1, and adsorbent dosage 1.0 g by Excel Solver using the GRG solving method. The adsorption data fitted best to the Langmuir model with correlation coefficient R2=0.993 and Chi-square value χ2=4.76. The Freundlich isotherm gave a correlation coefficient R2=0.933 and χ2=37.91. The adsorption process followed the pseudo-second-order model. The calculated thermodynamic parameters showed that the adsorption process was endothermic and not thermodynamically spontaneous. The studied zeolite-A can therefore be used as a promising adsorbent for the removal of Ca(II) ions from aqueous solutions.http://dx.doi.org/10.1155/2017/7025073 |
| spellingShingle | Upenyu Guyo Lycenter Yard Phiri Fidelis Chigondo Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite Journal of Chemistry |
| title | Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite |
| title_full | Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite |
| title_fullStr | Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite |
| title_full_unstemmed | Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite |
| title_short | Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite |
| title_sort | application of central composite design in the adsorption of ca ii on metakaolin zeolite |
| url | http://dx.doi.org/10.1155/2017/7025073 |
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