Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified Sepiolite
The adsorption of nitrate ions onto clay minerals has not been given much attention, possibly because clay surfaces are negatively charged. In order to increase the positive charge on the surface, sepiolite was modified in the present studies by treatment with dodecylethyldimethylammonium (DEDMA) br...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2005-05-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263617054769987 |
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| author | Adnan Özcan Mutlu Şahin Asiye Safa Özcan |
| author_facet | Adnan Özcan Mutlu Şahin Asiye Safa Özcan |
| author_sort | Adnan Özcan |
| collection | DOAJ |
| description | The adsorption of nitrate ions onto clay minerals has not been given much attention, possibly because clay surfaces are negatively charged. In order to increase the positive charge on the surface, sepiolite was modified in the present studies by treatment with dodecylethyldimethylammonium (DEDMA) bromide. After such modification, it was found that the maximum amount of nitrate ion adsorbed occurred at a pH value of 2.0. The chemical composition of natural sepiolite was determined by EDX methods and surface characterization of both natural and modified sepiolite samples was undertaken using FT-IR spectroscopic techniques. The adsorption of nitrate ions onto these adsorbents was determined by ion chromatography. The kinetic parameters of the adsorption process were calculated and it was shown that the reaction kinetic data could be fitted using the pseudo-second-order rate model. The calculated results indicate that both natural and surfactant-modified sepiolite are effective sorbents for the removal of anionic contaminants; however, the surfactant-modified sepiolite (453 mmol/kg) was more effective than the unmodified sepiolite (408 mmol/kg) in this respect. The adsorption data obtained were well described by the Freundlich adsorption isotherm. |
| format | Article |
| id | doaj-art-0a549a44647442cebbab4bdbcda4b310 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2005-05-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-0a549a44647442cebbab4bdbcda4b3102025-01-03T01:23:08ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382005-05-012310.1260/0263617054769987Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified SepioliteAdnan ÖzcanMutlu ŞahinAsiye Safa ÖzcanThe adsorption of nitrate ions onto clay minerals has not been given much attention, possibly because clay surfaces are negatively charged. In order to increase the positive charge on the surface, sepiolite was modified in the present studies by treatment with dodecylethyldimethylammonium (DEDMA) bromide. After such modification, it was found that the maximum amount of nitrate ion adsorbed occurred at a pH value of 2.0. The chemical composition of natural sepiolite was determined by EDX methods and surface characterization of both natural and modified sepiolite samples was undertaken using FT-IR spectroscopic techniques. The adsorption of nitrate ions onto these adsorbents was determined by ion chromatography. The kinetic parameters of the adsorption process were calculated and it was shown that the reaction kinetic data could be fitted using the pseudo-second-order rate model. The calculated results indicate that both natural and surfactant-modified sepiolite are effective sorbents for the removal of anionic contaminants; however, the surfactant-modified sepiolite (453 mmol/kg) was more effective than the unmodified sepiolite (408 mmol/kg) in this respect. The adsorption data obtained were well described by the Freundlich adsorption isotherm.https://doi.org/10.1260/0263617054769987 |
| spellingShingle | Adnan Özcan Mutlu Şahin Asiye Safa Özcan Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified Sepiolite Adsorption Science & Technology |
| title | Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified Sepiolite |
| title_full | Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified Sepiolite |
| title_fullStr | Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified Sepiolite |
| title_full_unstemmed | Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified Sepiolite |
| title_short | Adsorption of Nitrate Ions onto Sepiolite and Surfactant-Modified Sepiolite |
| title_sort | adsorption of nitrate ions onto sepiolite and surfactant modified sepiolite |
| url | https://doi.org/10.1260/0263617054769987 |
| work_keys_str_mv | AT adnanozcan adsorptionofnitrateionsontosepioliteandsurfactantmodifiedsepiolite AT mutlusahin adsorptionofnitrateionsontosepioliteandsurfactantmodifiedsepiolite AT asiyesafaozcan adsorptionofnitrateionsontosepioliteandsurfactantmodifiedsepiolite |