Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studies
Urban soils polluted with heavy metals are of increasing concern because it is greatly affecting human health and the ecological systems. Hence, it is mandatory to understand the reasons behind this pollution and remediate the contaminated solid. The removal of heavy metals from contaminated soil sa...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2015-09-01
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| Series: | International Soil and Water Conservation Research |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095633915300745 |
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| author | Shorouq I. Alghanmi Amani F. Al Sulami Tahani A. El-Zayat Basma G. Alhogbi Mohamed Abdel Salam |
| author_facet | Shorouq I. Alghanmi Amani F. Al Sulami Tahani A. El-Zayat Basma G. Alhogbi Mohamed Abdel Salam |
| author_sort | Shorouq I. Alghanmi |
| collection | DOAJ |
| description | Urban soils polluted with heavy metals are of increasing concern because it is greatly affecting human health and the ecological systems. Hence, it is mandatory to understand the reasons behind this pollution and remediate the contaminated solid. The removal of heavy metals from contaminated soil samples collected from the vicinity of the sewage lake in Jeddah, Saudi Arabia, was explored. The leaching process was studied kinetically and thermodynamically for better understanding of the remediation process. The results showed that the soil samples were slightly basic in nature, and tend to be more neutral away from the main contaminated sewage lake area. The total metal content in the soil samples was measured using the aqua regia extractions by ICP-OES and the results showed that many of the heavy metals present have significant concentrations above the tolerable limits. In general, the metal concentrations at different sites indicated that the heavy metal pollution is mainly due to the sewage discharge to the lake. The results showed excellent correlation between the concentrations of Co, As, and Hg with the distance from the main contaminated area. The leaching of Co, As, and Hg using 1.0 M hydrochloric acid from the soil was studied kinetically at different temperatures and the experimental results were fitted using different kinetics models. The experimental data were best described with two-constant rate and Elovich equation kinetic models. Also, the thermodynamic study showed that the leaching process was spontaneous, endothermic and accompanied with increase in the entropy. In general, the polluted soil could be remediated successfully from the heavy metals using the acid leaching procedure in a short period of time. |
| first_indexed | 2024-03-07T18:47:23Z |
| format | Article |
| id | doaj.art-737c4ee3af5f4fa7b649fdbcaacd9a59 |
| institution | Directory Open Access Journal |
| issn | 2095-6339 |
| language | English |
| last_indexed | 2024-03-07T18:47:23Z |
| publishDate | 2015-09-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | International Soil and Water Conservation Research |
| spelling | doaj.art-737c4ee3af5f4fa7b649fdbcaacd9a592024-03-02T02:17:48ZengKeAi Communications Co., Ltd.International Soil and Water Conservation Research2095-63392015-09-013319620810.1016/j.iswcr.2015.08.002Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studiesShorouq I. Alghanmi0Amani F. Al Sulami1Tahani A. El-Zayat2Basma G. Alhogbi3Mohamed Abdel Salam4Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi ArabiaChemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi ArabiaChemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi ArabiaChemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi ArabiaChemistry Department, Faculty of Science, King Abdulaziz University, Jeddah 21589, Kingdom of Saudi ArabiaUrban soils polluted with heavy metals are of increasing concern because it is greatly affecting human health and the ecological systems. Hence, it is mandatory to understand the reasons behind this pollution and remediate the contaminated solid. The removal of heavy metals from contaminated soil samples collected from the vicinity of the sewage lake in Jeddah, Saudi Arabia, was explored. The leaching process was studied kinetically and thermodynamically for better understanding of the remediation process. The results showed that the soil samples were slightly basic in nature, and tend to be more neutral away from the main contaminated sewage lake area. The total metal content in the soil samples was measured using the aqua regia extractions by ICP-OES and the results showed that many of the heavy metals present have significant concentrations above the tolerable limits. In general, the metal concentrations at different sites indicated that the heavy metal pollution is mainly due to the sewage discharge to the lake. The results showed excellent correlation between the concentrations of Co, As, and Hg with the distance from the main contaminated area. The leaching of Co, As, and Hg using 1.0 M hydrochloric acid from the soil was studied kinetically at different temperatures and the experimental results were fitted using different kinetics models. The experimental data were best described with two-constant rate and Elovich equation kinetic models. Also, the thermodynamic study showed that the leaching process was spontaneous, endothermic and accompanied with increase in the entropy. In general, the polluted soil could be remediated successfully from the heavy metals using the acid leaching procedure in a short period of time.http://www.sciencedirect.com/science/article/pii/S2095633915300745Acid leachingContaminated soilHeavy metalsKineticsThermodynamics |
| spellingShingle | Shorouq I. Alghanmi Amani F. Al Sulami Tahani A. El-Zayat Basma G. Alhogbi Mohamed Abdel Salam Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studies International Soil and Water Conservation Research Acid leaching Contaminated soil Heavy metals Kinetics Thermodynamics |
| title | Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studies |
| title_full | Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studies |
| title_fullStr | Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studies |
| title_full_unstemmed | Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studies |
| title_short | Acid leaching of heavy metals from contaminated soil collected from Jeddah, Saudi Arabia: kinetic and thermodynamics studies |
| title_sort | acid leaching of heavy metals from contaminated soil collected from jeddah saudi arabia kinetic and thermodynamics studies |
| topic | Acid leaching Contaminated soil Heavy metals Kinetics Thermodynamics |
| url | http://www.sciencedirect.com/science/article/pii/S2095633915300745 |
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