Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study
The wastewater generated from textile industries is highly colored and contains dyes including azo dyes, which are toxic to human and water-living organisms. The treatment of these azo dyes using conventional treatment techniques is challenging due to their recalcitrant properties. In the current st...
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| Format: | Article |
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Elsevier
2022-08-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844022014645 |
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| author | Sonia Akter Md. Shahinoor Islam |
| author_facet | Sonia Akter Md. Shahinoor Islam |
| author_sort | Sonia Akter |
| collection | DOAJ |
| description | The wastewater generated from textile industries is highly colored and contains dyes including azo dyes, which are toxic to human and water-living organisms. The treatment of these azo dyes using conventional treatment techniques is challenging due to their recalcitrant properties. In the current study, the effect of additional Fe2+ on electrocoagulation (EC) using Fe electrodes has been studied for the removal of methyl orange (MO) azo dye. pH between 4-5 was found to be optimum for EC and treatment efficiency decreased with increasing dye concentrations. With the addition of Fe2+ salt, dye removal for a certain concentration was increased with the increase of current density and Fe2+ up to a certain limit and after that, the removal efficiency decreased. The COD, color and dye removals were 88.5%, 93.1% and 100%, respectively, for EC of 200 mg.L−1 dye solution using only 0.20 mmol.L−1 Fe2+ for 0.40 mA cm−2 current density, whereas for EC, the respective removal efficiencies were 76.7%, 63.4% and 82.4% for 32 min. The respective operating cost for EC was $768 kg−1 removed dye ($0.342 m−3), whereas, for EC with additional Fe2+ salt, it was $350 kg−1 removed dye ($0.189 m−3). The kinetic results revealed that the first-order kinetic model was fitted best for EC, whereas the second-order kinetic model was best fitted for Fe2+ added EC. For real textile wastewater, 57.6% COD removal was obtained for 0.15 mmol.L−1 Fe2+ added EC compared to 27.8% COD removal for EC for 32 min. Based on the study we can conclude that Fe2+ assisted EC can be used for effective treatment of textile wastewater containing toxic compounds like azo dyes. |
| first_indexed | 2024-04-13T17:59:52Z |
| format | Article |
| id | doaj.art-6c3b8f7a5555430ea1cf55fa27c773f8 |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-04-13T17:59:52Z |
| publishDate | 2022-08-01 |
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| spelling | doaj.art-6c3b8f7a5555430ea1cf55fa27c773f82022-12-22T02:36:17ZengElsevierHeliyon2405-84402022-08-0188e10176Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic studySonia Akter0Md. Shahinoor Islam1Department of Chemical Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1000, BangladeshCorresponding author.; Department of Chemical Engineering, Bangladesh University of Engineering and Technology, Dhaka, 1000, BangladeshThe wastewater generated from textile industries is highly colored and contains dyes including azo dyes, which are toxic to human and water-living organisms. The treatment of these azo dyes using conventional treatment techniques is challenging due to their recalcitrant properties. In the current study, the effect of additional Fe2+ on electrocoagulation (EC) using Fe electrodes has been studied for the removal of methyl orange (MO) azo dye. pH between 4-5 was found to be optimum for EC and treatment efficiency decreased with increasing dye concentrations. With the addition of Fe2+ salt, dye removal for a certain concentration was increased with the increase of current density and Fe2+ up to a certain limit and after that, the removal efficiency decreased. The COD, color and dye removals were 88.5%, 93.1% and 100%, respectively, for EC of 200 mg.L−1 dye solution using only 0.20 mmol.L−1 Fe2+ for 0.40 mA cm−2 current density, whereas for EC, the respective removal efficiencies were 76.7%, 63.4% and 82.4% for 32 min. The respective operating cost for EC was $768 kg−1 removed dye ($0.342 m−3), whereas, for EC with additional Fe2+ salt, it was $350 kg−1 removed dye ($0.189 m−3). The kinetic results revealed that the first-order kinetic model was fitted best for EC, whereas the second-order kinetic model was best fitted for Fe2+ added EC. For real textile wastewater, 57.6% COD removal was obtained for 0.15 mmol.L−1 Fe2+ added EC compared to 27.8% COD removal for EC for 32 min. Based on the study we can conclude that Fe2+ assisted EC can be used for effective treatment of textile wastewater containing toxic compounds like azo dyes.http://www.sciencedirect.com/science/article/pii/S2405844022014645ElectrocoagulationIron electrodesCost estimationDegradation kineticsMethyl orange |
| spellingShingle | Sonia Akter Md. Shahinoor Islam Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study Heliyon Electrocoagulation Iron electrodes Cost estimation Degradation kinetics Methyl orange |
| title | Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study |
| title_full | Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study |
| title_fullStr | Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study |
| title_full_unstemmed | Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study |
| title_short | Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study |
| title_sort | effect of additional fe2 salt on electrocoagulation process for the degradation of methyl orange dye an optimization and kinetic study |
| topic | Electrocoagulation Iron electrodes Cost estimation Degradation kinetics Methyl orange |
| url | http://www.sciencedirect.com/science/article/pii/S2405844022014645 |
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