Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption Mechanism
In general, it was found that loading hydrous ferric oxide (HFO) with transition metal ions led to a decrease in both the internal surface and external surface area. The micropore volume in the microporous samples (obtained by heating the oxide at 50°C and 200°C) and the total pore volume in both sa...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2002-06-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/026361702320644789 |
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| author | L.B. Khalil M.N. Alaya N.Sh. Petro R.M.M. Abo Elenein |
| author_facet | L.B. Khalil M.N. Alaya N.Sh. Petro R.M.M. Abo Elenein |
| author_sort | L.B. Khalil |
| collection | DOAJ |
| description | In general, it was found that loading hydrous ferric oxide (HFO) with transition metal ions led to a decrease in both the internal surface and external surface area. The micropore volume in the microporous samples (obtained by heating the oxide at 50°C and 200°C) and the total pore volume in both samples and in the mesoporous sample (obtained by heating the oxide at 400°C) also decreased. The mean pore radius, however, appeared to be little altered in all the samples. The observed effects cannot be interpreted on the basis of the adsorption of unhydrated transition metal ions, nor by assuming precipitation of these ions as hydroxides inside the pores. The only other possibility was the assumption that the adsorption of these ions was accompanied by the adsorption of relatively more strongly adsorbed water (not removed during evacuation of the samples) and/or the transformation of water already present in the oxide to strongly adsorbed water. This conclusion was confirmed by comparing the water loss at 100°C and 200°C in the original and metal-loaded HFO samples. |
| format | Article |
| id | doaj-art-4b9b8f6d34dc4496bad9cae4aa14d742 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2002-06-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-4b9b8f6d34dc4496bad9cae4aa14d7422025-01-02T22:37:35ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382002-06-012010.1260/026361702320644789Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption MechanismL.B. Khalil0M.N. Alaya1N.Sh. Petro2R.M.M. Abo Elenein3 Laboratory of Surface Chemistry and Catalysis, National Research Centre, Cairo, Egypt Department of Physical Chemistry, Faculty of Science, Aleppo University, Aleppo, Syria Laboratory of Surface Chemistry and Catalysis, National Research Centre, Cairo, Egypt Laboratory of Surface Chemistry and Catalysis, National Research Centre, Cairo, EgyptIn general, it was found that loading hydrous ferric oxide (HFO) with transition metal ions led to a decrease in both the internal surface and external surface area. The micropore volume in the microporous samples (obtained by heating the oxide at 50°C and 200°C) and the total pore volume in both samples and in the mesoporous sample (obtained by heating the oxide at 400°C) also decreased. The mean pore radius, however, appeared to be little altered in all the samples. The observed effects cannot be interpreted on the basis of the adsorption of unhydrated transition metal ions, nor by assuming precipitation of these ions as hydroxides inside the pores. The only other possibility was the assumption that the adsorption of these ions was accompanied by the adsorption of relatively more strongly adsorbed water (not removed during evacuation of the samples) and/or the transformation of water already present in the oxide to strongly adsorbed water. This conclusion was confirmed by comparing the water loss at 100°C and 200°C in the original and metal-loaded HFO samples.https://doi.org/10.1260/026361702320644789 |
| spellingShingle | L.B. Khalil M.N. Alaya N.Sh. Petro R.M.M. Abo Elenein Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption Mechanism Adsorption Science & Technology |
| title | Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption Mechanism |
| title_full | Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption Mechanism |
| title_fullStr | Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption Mechanism |
| title_full_unstemmed | Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption Mechanism |
| title_short | Changes in the Porous Texture of Hydrous Ferric Oxide on Adsorption of Transition Metal Ions: Adsorption Mechanism |
| title_sort | changes in the porous texture of hydrous ferric oxide on adsorption of transition metal ions adsorption mechanism |
| url | https://doi.org/10.1260/026361702320644789 |
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