Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface Methodology
Hydrous cerium–zirconium oxide (Ce 0.25 Zr 0.75 O 2 ) was used for Cr(VI) removal by adsorption. The response surface methodology (RSM) was applied as a tool for the optimization of adsorption operational conditions (temperature, pH and adsorbent dose) with the combined effects of the key processing...
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SAGE Publishing
2014-03-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.32.2-3.209 |
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| author | C.A. Rivera Corredor M.Á. Gómez García I. Dobrosz-Gómez |
| author_facet | C.A. Rivera Corredor M.Á. Gómez García I. Dobrosz-Gómez |
| author_sort | C.A. Rivera Corredor |
| collection | DOAJ |
| description | Hydrous cerium–zirconium oxide (Ce 0.25 Zr 0.75 O 2 ) was used for Cr(VI) removal by adsorption. The response surface methodology (RSM) was applied as a tool for the optimization of adsorption operational conditions (temperature, pH and adsorbent dose) with the combined effects of the key processing variables on the Cr removal efficiency (%R Cr ). The following conditions were found to be optimal: pH = 2, temperature = 28 °C, adsorbent dose = 4 g l −1 . The %R Cr obtained experimentally (92%) was in agreement with the value predicted by RSM (88%). The adsorption process followed the pseudo-second-order kinetic model and obeyed the Langmuir isotherm model. Thermodynamic parameters (ΔH°, ΔS° and ΔG°) indicated the exothermic and spontaneous nature of adsorption governed by physisorption interactions. Hydrous Ce 0.25 Zr 0.75 O 2 showed high adsorption capacity (25 mg g −1 ), high desorption efficiency (80%), reached adsorption equilibrium quickly (30 minutes) and high chemical stability. The Cr(VI) adsorption on hydrous Ce 0.25 Zr 0.75 O 2 was not completely reversible. The reduction of Cr(VI) to Cr(III) under acidic conditions was also responsible for Cr(VI) removal. |
| format | Article |
| id | doaj-art-d2864ccea34a4a309ed9a0cd0fca2774 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2014-03-01 |
| publisher | SAGE Publishing |
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| series | Adsorption Science & Technology |
| spelling | doaj-art-d2864ccea34a4a309ed9a0cd0fca27742025-01-02T21:31:18ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382014-03-013210.1260/0263-6174.32.2-3.209Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface MethodologyC.A. Rivera Corredor0M.Á. Gómez García1I. Dobrosz-Gómez2 Departamento de Ingeniería Química, Facultad de Ingeniería y Arquitectura Departamento de Ingeniería Química, Facultad de Ingeniería y Arquitectura Departamento de Física y Química, Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Colombia, Sede Manizales, Campus La Nubia, Km 9 vía al Aeropuerto la Nubia, Apartado Aéreo 127, Manizales, Caldas, ColombiaHydrous cerium–zirconium oxide (Ce 0.25 Zr 0.75 O 2 ) was used for Cr(VI) removal by adsorption. The response surface methodology (RSM) was applied as a tool for the optimization of adsorption operational conditions (temperature, pH and adsorbent dose) with the combined effects of the key processing variables on the Cr removal efficiency (%R Cr ). The following conditions were found to be optimal: pH = 2, temperature = 28 °C, adsorbent dose = 4 g l −1 . The %R Cr obtained experimentally (92%) was in agreement with the value predicted by RSM (88%). The adsorption process followed the pseudo-second-order kinetic model and obeyed the Langmuir isotherm model. Thermodynamic parameters (ΔH°, ΔS° and ΔG°) indicated the exothermic and spontaneous nature of adsorption governed by physisorption interactions. Hydrous Ce 0.25 Zr 0.75 O 2 showed high adsorption capacity (25 mg g −1 ), high desorption efficiency (80%), reached adsorption equilibrium quickly (30 minutes) and high chemical stability. The Cr(VI) adsorption on hydrous Ce 0.25 Zr 0.75 O 2 was not completely reversible. The reduction of Cr(VI) to Cr(III) under acidic conditions was also responsible for Cr(VI) removal.https://doi.org/10.1260/0263-6174.32.2-3.209 |
| spellingShingle | C.A. Rivera Corredor M.Á. Gómez García I. Dobrosz-Gómez Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface Methodology Adsorption Science & Technology |
| title | Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface Methodology |
| title_full | Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface Methodology |
| title_fullStr | Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface Methodology |
| title_full_unstemmed | Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface Methodology |
| title_short | Adsorptive Removal of Cr(VI) from Aqueous Solution on Hydrous Cerium—Zirconium Oxide. Part I: Process Optimization by Response Surface Methodology |
| title_sort | adsorptive removal of cr vi from aqueous solution on hydrous cerium zirconium oxide part i process optimization by response surface methodology |
| url | https://doi.org/10.1260/0263-6174.32.2-3.209 |
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