Extraction and enrichment of lead from contaminated soil using chelation reactions
Heavy metals such as lead (Pb) are significantly harmful to human health and may have disastrous effects on the ecosystem. Consequently, Pb-contaminated soil necessitates remediation to bring Pb levels below the standard threshold of 150 mg/kg. This study aimed to devise processes for extracting and...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Results in Chemistry |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211715624001693 |
| _version_ | 1797226679604609024 |
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| author | Tomohito Kameda Rena Suto Mir Tamzid Rahman Shogo Kumagai Yuko Saito Yasuyuki Nomura Daiki Kawamura Toshiaki Yoshioka |
| author_facet | Tomohito Kameda Rena Suto Mir Tamzid Rahman Shogo Kumagai Yuko Saito Yasuyuki Nomura Daiki Kawamura Toshiaki Yoshioka |
| author_sort | Tomohito Kameda |
| collection | DOAJ |
| description | Heavy metals such as lead (Pb) are significantly harmful to human health and may have disastrous effects on the ecosystem. Consequently, Pb-contaminated soil necessitates remediation to bring Pb levels below the standard threshold of 150 mg/kg. This study aimed to devise processes for extracting and enriching Pb using chelation reactions. Pb was effectively extracted from the soil using EDTA as the chelating agent, forming a complex ([Pb-HEDTA]-) that is solubilized in the solution. Extraction efficiency increased with higher EDTA/Pb molar ratios, remaining relatively constant at 100 or above. Elevated temperatures also enhanced Pb extraction; concentrations below 150 mg/kg were achieved at 25 °C or higher. The desorption of Pb followed the Langmuir equation, indicating uniform one-to-one Pb desorption. The addition of the chelating flocculant diethyldithiocarbamic acid (DDTC) concentrated Pb in the solid phase, reducing sludge volume. Pb transfer rate rose with increasing DDTC/[Pb-EDTA]2− ratio, peaking at 90 % with a ratio of 50. The presence and extraction of other elements (Fe, Cu, and Zn) did not impede Pb extraction and enrichment. Therefore, this study and its findings could provide the basis for further development of the Pb extraction process and mitigate the problem of Pb-contaminated soil when designing Pb extraction plants. |
| first_indexed | 2024-04-24T14:28:45Z |
| format | Article |
| id | doaj.art-2cbcbbc152ff4eb984ef64c67e3e7997 |
| institution | Directory Open Access Journal |
| issn | 2211-7156 |
| language | English |
| last_indexed | 2024-04-24T14:28:45Z |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Chemistry |
| spelling | doaj.art-2cbcbbc152ff4eb984ef64c67e3e79972024-04-03T04:26:34ZengElsevierResults in Chemistry2211-71562024-01-017101473Extraction and enrichment of lead from contaminated soil using chelation reactionsTomohito Kameda0Rena Suto1Mir Tamzid Rahman2Shogo Kumagai3Yuko Saito4Yasuyuki Nomura5Daiki Kawamura6Toshiaki Yoshioka7Graduate School of Environmental Studies, Tohoku University, 6−6−07 Aoba, Aramaki, Aoba−ku, Sendai 980-8579, Japan; Corresponding author.Graduate School of Environmental Studies, Tohoku University, 6−6−07 Aoba, Aramaki, Aoba−ku, Sendai 980-8579, JapanGraduate School of Environmental Studies, Tohoku University, 6−6−07 Aoba, Aramaki, Aoba−ku, Sendai 980-8579, Japan; Department of Chemistry, Jahangirnagar University, Savar, Dhaka 1342, BangladeshGraduate School of Environmental Studies, Tohoku University, 6−6−07 Aoba, Aramaki, Aoba−ku, Sendai 980-8579, JapanGraduate School of Environmental Studies, Tohoku University, 6−6−07 Aoba, Aramaki, Aoba−ku, Sendai 980-8579, JapanEnvironmental Business Department, Civil Engineering Department, Kumagai Gumi Company, Limited, 1043 Onigakubo, Tsukuba City, Ibaraki 300-2651, JapanTechnical Research Institute, Technical Department, Kumagai Gumi Company, Limited, 1043 Onigakubo, Tsukuba City, Ibaraki 300-2651, JapanGraduate School of Environmental Studies, Tohoku University, 6−6−07 Aoba, Aramaki, Aoba−ku, Sendai 980-8579, JapanHeavy metals such as lead (Pb) are significantly harmful to human health and may have disastrous effects on the ecosystem. Consequently, Pb-contaminated soil necessitates remediation to bring Pb levels below the standard threshold of 150 mg/kg. This study aimed to devise processes for extracting and enriching Pb using chelation reactions. Pb was effectively extracted from the soil using EDTA as the chelating agent, forming a complex ([Pb-HEDTA]-) that is solubilized in the solution. Extraction efficiency increased with higher EDTA/Pb molar ratios, remaining relatively constant at 100 or above. Elevated temperatures also enhanced Pb extraction; concentrations below 150 mg/kg were achieved at 25 °C or higher. The desorption of Pb followed the Langmuir equation, indicating uniform one-to-one Pb desorption. The addition of the chelating flocculant diethyldithiocarbamic acid (DDTC) concentrated Pb in the solid phase, reducing sludge volume. Pb transfer rate rose with increasing DDTC/[Pb-EDTA]2− ratio, peaking at 90 % with a ratio of 50. The presence and extraction of other elements (Fe, Cu, and Zn) did not impede Pb extraction and enrichment. Therefore, this study and its findings could provide the basis for further development of the Pb extraction process and mitigate the problem of Pb-contaminated soil when designing Pb extraction plants.http://www.sciencedirect.com/science/article/pii/S2211715624001693Contaminated soilLeadExtractionEnrichmentChelation reaction |
| spellingShingle | Tomohito Kameda Rena Suto Mir Tamzid Rahman Shogo Kumagai Yuko Saito Yasuyuki Nomura Daiki Kawamura Toshiaki Yoshioka Extraction and enrichment of lead from contaminated soil using chelation reactions Results in Chemistry Contaminated soil Lead Extraction Enrichment Chelation reaction |
| title | Extraction and enrichment of lead from contaminated soil using chelation reactions |
| title_full | Extraction and enrichment of lead from contaminated soil using chelation reactions |
| title_fullStr | Extraction and enrichment of lead from contaminated soil using chelation reactions |
| title_full_unstemmed | Extraction and enrichment of lead from contaminated soil using chelation reactions |
| title_short | Extraction and enrichment of lead from contaminated soil using chelation reactions |
| title_sort | extraction and enrichment of lead from contaminated soil using chelation reactions |
| topic | Contaminated soil Lead Extraction Enrichment Chelation reaction |
| url | http://www.sciencedirect.com/science/article/pii/S2211715624001693 |
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