Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya
Heavy metals’ discharge into the environment continues to pose grave concerns around the world. The efficacy of a hydrous alumino-silicate clay (AlSiM) coming obtained from some regions of Kenya to sorb heavy-metal ions from water has been evaluated in batch tests taking into account changes in adso...
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| Format: | Article |
| Language: | English |
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Chemical Society of Ethiopia
2018-04-01
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| Series: | Bulletin of the Chemical Society of Ethiopia |
| Subjects: | |
| Online Access: | https://www.ajol.info/index.php/bcse/article/view/169507 |
| _version_ | 1811267121890459648 |
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| author | E. W. Wambu S. Attahiru P. M. Shiundu J. Wabomba |
| author_facet | E. W. Wambu S. Attahiru P. M. Shiundu J. Wabomba |
| author_sort | E. W. Wambu |
| collection | DOAJ |
| description | Heavy metals’ discharge into the environment continues to pose grave concerns around the world. The efficacy of a hydrous alumino-silicate clay (AlSiM) coming obtained from some regions of Kenya to sorb heavy-metal ions from water has been evaluated in batch tests taking into account changes in adsorbent dose, pH, contact time, and temperature. Complete metal removals, from water containing up to 66 mg/L of Pb(II) was achieved using this material at pH value of 5 over a temperature range of 289–333 K. The adsorption data fitted both the Langmuir and the Dubinin-Radushkevich isotherms with R2 > 0.99. The D-R adsorption energy (−11.7 kJ/mol) indicated that chemisorption was the primary reaction in the adsorption process and the derived ∆G0 value (−7.45 kJ/mol) was consistent with the spontaneity of the adsorption process. The kinetic analyses indicated a film-diffusion and surface-chemisorption controlled process. Verification of the initial results on heavy metals-containing wastewaters obtained from a tannery and a leather processing industries revealed excellent adsorption efficacies of AlSiM for Cr3+ (99−100%), Fe3+ (96−98%), Mn2+ (85−97%) and Zn2+ (78−86%). The use of AlSiM as a plausible low-cost adsorbent for heavy-metal decontamination of industrial effluents has therefore been demonstrated. |
| first_indexed | 2024-04-12T20:56:47Z |
| format | Article |
| id | doaj.art-4f901343f95c4a3da0cb5395cee92a07 |
| institution | Directory Open Access Journal |
| issn | 1011-3924 1726-801X |
| language | English |
| last_indexed | 2024-04-12T20:56:47Z |
| publishDate | 2018-04-01 |
| publisher | Chemical Society of Ethiopia |
| record_format | Article |
| series | Bulletin of the Chemical Society of Ethiopia |
| spelling | doaj.art-4f901343f95c4a3da0cb5395cee92a072022-12-22T03:16:58ZengChemical Society of EthiopiaBulletin of the Chemical Society of Ethiopia1011-39241726-801X2018-04-013213951https://dx.doi.org/10.4314/bcse.v32i1.4Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from KenyaE. W. WambuS. AttahiruP. M. ShiunduJ. WabombaHeavy metals’ discharge into the environment continues to pose grave concerns around the world. The efficacy of a hydrous alumino-silicate clay (AlSiM) coming obtained from some regions of Kenya to sorb heavy-metal ions from water has been evaluated in batch tests taking into account changes in adsorbent dose, pH, contact time, and temperature. Complete metal removals, from water containing up to 66 mg/L of Pb(II) was achieved using this material at pH value of 5 over a temperature range of 289–333 K. The adsorption data fitted both the Langmuir and the Dubinin-Radushkevich isotherms with R2 > 0.99. The D-R adsorption energy (−11.7 kJ/mol) indicated that chemisorption was the primary reaction in the adsorption process and the derived ∆G0 value (−7.45 kJ/mol) was consistent with the spontaneity of the adsorption process. The kinetic analyses indicated a film-diffusion and surface-chemisorption controlled process. Verification of the initial results on heavy metals-containing wastewaters obtained from a tannery and a leather processing industries revealed excellent adsorption efficacies of AlSiM for Cr3+ (99−100%), Fe3+ (96−98%), Mn2+ (85−97%) and Zn2+ (78−86%). The use of AlSiM as a plausible low-cost adsorbent for heavy-metal decontamination of industrial effluents has therefore been demonstrated.https://www.ajol.info/index.php/bcse/article/view/169507AdsorptionClaysDubinin-RadushkevichHeavy metalsIsothermsKineticsLangmuirWastewater |
| spellingShingle | E. W. Wambu S. Attahiru P. M. Shiundu J. Wabomba Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya Bulletin of the Chemical Society of Ethiopia Adsorption Clays Dubinin-Radushkevich Heavy metals Isotherms Kinetics Langmuir Wastewater |
| title | Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya |
| title_full | Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya |
| title_fullStr | Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya |
| title_full_unstemmed | Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya |
| title_short | Removal of heavy-metals from wastewater using a hydrous alumino-silicate mineral from Kenya |
| title_sort | removal of heavy metals from wastewater using a hydrous alumino silicate mineral from kenya |
| topic | Adsorption Clays Dubinin-Radushkevich Heavy metals Isotherms Kinetics Langmuir Wastewater |
| url | https://www.ajol.info/index.php/bcse/article/view/169507 |
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