Comparative Removal of Cr(VI) and F− Ions from Water by Freezing Technology
Trace element ions, such as Cr(VI) and F−, are of particular interest due to their environmental impact. Both ions exhibit an anionic nature in water that can show similar removal tendencies except for their significant differences in ionic radius, speciation forms, and kosmotropic-chaotropic behavi...
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| Language: | English |
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Wiley
2022-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2022/9143182 |
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| author | Fekadu Melak Tsegaye Girma Asere |
| author_facet | Fekadu Melak Tsegaye Girma Asere |
| author_sort | Fekadu Melak |
| collection | DOAJ |
| description | Trace element ions, such as Cr(VI) and F−, are of particular interest due to their environmental impact. Both ions exhibit an anionic nature in water that can show similar removal tendencies except for their significant differences in ionic radius, speciation forms, and kosmotropic-chaotropic behaviors. Accordingly, partial freezing was performed to examine the comparative freeze separation efficiencies of Cr(VI) and F– from aqueous solutions. Freeze desalination influencing parameters such as initial ion concentration, salt addition, and freeze duration were explored. Under optimal operating conditions, freeze separation efficiencies of 90 ± 0.12 to 95 ± 0.54% and 58 ± 0.23% to 60 ± 0.34% from 5 mg/L of Cr(VI) and F–, respectively, were demonstrated. The salt addition into the F–-containing solutions revealed more F– ion intercalation into the ice, initiating the decrement of freeze separation efficiency. The influences of structuring-destructuring (kosmotropicity-chaotropicity) and the size-exclusion nature of ice crystals were used to explain the plausible mechanism for the difference in freeze separation efficiency between Cr(VI) and F– ions. |
| format | Article |
| id | doaj-art-a5fe34d32cfd46209f487e87168720c9 |
| institution | Kabale University |
| issn | 2090-9071 |
| language | English |
| publishDate | 2022-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Journal of Chemistry |
| spelling | doaj-art-a5fe34d32cfd46209f487e87168720c92025-02-03T01:06:47ZengWileyJournal of Chemistry2090-90712022-01-01202210.1155/2022/9143182Comparative Removal of Cr(VI) and F− Ions from Water by Freezing TechnologyFekadu Melak0Tsegaye Girma Asere1College of Health SciencesCollege of Natural SciencesTrace element ions, such as Cr(VI) and F−, are of particular interest due to their environmental impact. Both ions exhibit an anionic nature in water that can show similar removal tendencies except for their significant differences in ionic radius, speciation forms, and kosmotropic-chaotropic behaviors. Accordingly, partial freezing was performed to examine the comparative freeze separation efficiencies of Cr(VI) and F– from aqueous solutions. Freeze desalination influencing parameters such as initial ion concentration, salt addition, and freeze duration were explored. Under optimal operating conditions, freeze separation efficiencies of 90 ± 0.12 to 95 ± 0.54% and 58 ± 0.23% to 60 ± 0.34% from 5 mg/L of Cr(VI) and F–, respectively, were demonstrated. The salt addition into the F–-containing solutions revealed more F– ion intercalation into the ice, initiating the decrement of freeze separation efficiency. The influences of structuring-destructuring (kosmotropicity-chaotropicity) and the size-exclusion nature of ice crystals were used to explain the plausible mechanism for the difference in freeze separation efficiency between Cr(VI) and F– ions.http://dx.doi.org/10.1155/2022/9143182 |
| spellingShingle | Fekadu Melak Tsegaye Girma Asere Comparative Removal of Cr(VI) and F− Ions from Water by Freezing Technology Journal of Chemistry |
| title | Comparative Removal of Cr(VI) and F− Ions from Water by Freezing Technology |
| title_full | Comparative Removal of Cr(VI) and F− Ions from Water by Freezing Technology |
| title_fullStr | Comparative Removal of Cr(VI) and F− Ions from Water by Freezing Technology |
| title_full_unstemmed | Comparative Removal of Cr(VI) and F− Ions from Water by Freezing Technology |
| title_short | Comparative Removal of Cr(VI) and F− Ions from Water by Freezing Technology |
| title_sort | comparative removal of cr vi and f ions from water by freezing technology |
| url | http://dx.doi.org/10.1155/2022/9143182 |
| work_keys_str_mv | AT fekadumelak comparativeremovalofcrviandfionsfromwaterbyfreezingtechnology AT tsegayegirmaasere comparativeremovalofcrviandfionsfromwaterbyfreezingtechnology |