The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmium
Investigating the effect of presoaking, as one of the most important physical factors affecting the adsorption behavior of biochar, on the adsorption of heavy metals by modified or non-modified biochar and presoaking mechanism is still an open issue. In this study, the water presoaking effect on the...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-06-01
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| Series: | Ecotoxicology and Environmental Safety |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0147651323004360 |
| _version_ | 1797833104727998464 |
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| author | Bahram Abolfazli Behrooz Shahin Oustan Hossein Mirseyed Hosseini Hassan Etesami Elio Padoan Giuliana Magnacca Franco Ajmone Marsan |
| author_facet | Bahram Abolfazli Behrooz Shahin Oustan Hossein Mirseyed Hosseini Hassan Etesami Elio Padoan Giuliana Magnacca Franco Ajmone Marsan |
| author_sort | Bahram Abolfazli Behrooz |
| collection | DOAJ |
| description | Investigating the effect of presoaking, as one of the most important physical factors affecting the adsorption behavior of biochar, on the adsorption of heavy metals by modified or non-modified biochar and presoaking mechanism is still an open issue. In this study, the water presoaking effect on the kinetics of cadmium (Cd) adsorption by rice husk biochar (produced at 450 °C, B1, and at 600 °C, B2) and the rice husk biochar modified with magnesium chloride (B1 modified with MgCl2, MB1, and B2 modified with MgCl2, MB2) was investigated. Furthermore, the effect of pH (2, 5, and 6), temperature (15, 25, and 35 °C), and biochar particle size (100 and 500 µm) on the kinetics of Cd adsorption was also investigated. Results revealed that the content of Cd adsorbed by the presoaked biochar was significantly higher than that by the non-presoaked biochar. The highest Cd adsorption capacity of MB2 and MB1 was 98.4 and 97.6 mg g−1, respectively, which was much better than that of B1 (7.6 mg g−1) and B2 (7.5 mg g−1). The modeling of kinetics results showed that in all cases pseudo-second-order model was well-fitted (R2>0.99) with Cd adsorption data. The results also indicated that the highest Cd adsorption values were observed at pH 6 in presoaked MB1 with size of 100 µm as well as at the temperature of 35 °C in presoaked MB2, indicating the optimum conditions for this process. The presoaking process was not affected by biochar size and pH, and the difference in adsorbed Cd content between presoaked biochars and non-presoaked ones was also similar. However, the temperature had a negative effect on presoaking. The presoaking process decreased micropores (<10 µm) in the biochars but had no effect on biochar hydrophobicity. Therefore, presoaking, which could significantly increase Cd adsorption and reduce equilibrium time by reducing the micropores of biochars, is suggested as an effective strategy for improving the efficiency of modified biochars or non-modified ones in the adsorption of contaminants (Cd) from aquatic media. |
| first_indexed | 2024-04-09T14:19:21Z |
| format | Article |
| id | doaj.art-4544078f78744ffd8680ff89c9212a2f |
| institution | Directory Open Access Journal |
| issn | 0147-6513 |
| language | English |
| last_indexed | 2024-04-09T14:19:21Z |
| publishDate | 2023-06-01 |
| publisher | Elsevier |
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| series | Ecotoxicology and Environmental Safety |
| spelling | doaj.art-4544078f78744ffd8680ff89c9212a2f2023-05-05T04:39:40ZengElsevierEcotoxicology and Environmental Safety0147-65132023-06-01257114932The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmiumBahram Abolfazli Behrooz0Shahin Oustan1Hossein Mirseyed Hosseini2Hassan Etesami3Elio Padoan4Giuliana Magnacca5Franco Ajmone Marsan6Department of Soil Science, College of Agriculture and Natural Resources, University of Tehran, Tehran, IranSoil Science Department, Agricultural Faculty, University of Tabriz, IranDepartment of Soil Science, College of Agriculture and Natural Resources, University of Tehran, Tehran, IranDepartment of Soil Science, College of Agriculture and Natural Resources, University of Tehran, Tehran, Iran; Corresponding author.Dipartimento di Scienze Agrarie, Forestali e Alimentari, Università degli Studi di Torino, Grugliasco, TO, ItalyDipartimento di chimica, Università degli Studi di Torino, Torino, ItalyDipartimento di Scienze Agrarie, Forestali e Alimentari, Università degli Studi di Torino, Grugliasco, TO, ItalyInvestigating the effect of presoaking, as one of the most important physical factors affecting the adsorption behavior of biochar, on the adsorption of heavy metals by modified or non-modified biochar and presoaking mechanism is still an open issue. In this study, the water presoaking effect on the kinetics of cadmium (Cd) adsorption by rice husk biochar (produced at 450 °C, B1, and at 600 °C, B2) and the rice husk biochar modified with magnesium chloride (B1 modified with MgCl2, MB1, and B2 modified with MgCl2, MB2) was investigated. Furthermore, the effect of pH (2, 5, and 6), temperature (15, 25, and 35 °C), and biochar particle size (100 and 500 µm) on the kinetics of Cd adsorption was also investigated. Results revealed that the content of Cd adsorbed by the presoaked biochar was significantly higher than that by the non-presoaked biochar. The highest Cd adsorption capacity of MB2 and MB1 was 98.4 and 97.6 mg g−1, respectively, which was much better than that of B1 (7.6 mg g−1) and B2 (7.5 mg g−1). The modeling of kinetics results showed that in all cases pseudo-second-order model was well-fitted (R2>0.99) with Cd adsorption data. The results also indicated that the highest Cd adsorption values were observed at pH 6 in presoaked MB1 with size of 100 µm as well as at the temperature of 35 °C in presoaked MB2, indicating the optimum conditions for this process. The presoaking process was not affected by biochar size and pH, and the difference in adsorbed Cd content between presoaked biochars and non-presoaked ones was also similar. However, the temperature had a negative effect on presoaking. The presoaking process decreased micropores (<10 µm) in the biochars but had no effect on biochar hydrophobicity. Therefore, presoaking, which could significantly increase Cd adsorption and reduce equilibrium time by reducing the micropores of biochars, is suggested as an effective strategy for improving the efficiency of modified biochars or non-modified ones in the adsorption of contaminants (Cd) from aquatic media.http://www.sciencedirect.com/science/article/pii/S0147651323004360Presoaking mechanismAdsorption kineticsCadmium removalMg-modified biochar |
| spellingShingle | Bahram Abolfazli Behrooz Shahin Oustan Hossein Mirseyed Hosseini Hassan Etesami Elio Padoan Giuliana Magnacca Franco Ajmone Marsan The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmium Ecotoxicology and Environmental Safety Presoaking mechanism Adsorption kinetics Cadmium removal Mg-modified biochar |
| title | The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmium |
| title_full | The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmium |
| title_fullStr | The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmium |
| title_full_unstemmed | The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmium |
| title_short | The importance of presoaking to improve the efficiency of MgCl2-modified and non-modified biochar in the adsorption of cadmium |
| title_sort | importance of presoaking to improve the efficiency of mgcl2 modified and non modified biochar in the adsorption of cadmium |
| topic | Presoaking mechanism Adsorption kinetics Cadmium removal Mg-modified biochar |
| url | http://www.sciencedirect.com/science/article/pii/S0147651323004360 |
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