Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI)
This study aims to clarify the removal mechanism and to calculate the effective current of electrocoagulation (i.e., EC) for treating wastewater containing Ni(II), Cu(II), and Cr(VI). The adsorption behavior of various heavy metals onto Al(OH)<sub>3</sub> coagulant generated by the EC pr...
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MDPI AG
2020-09-01
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| Series: | Water |
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| Online Access: | https://www.mdpi.com/2073-4441/12/9/2614 |
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| author | Chien-Hung Huang Shan-Yi Shen Cheng-Di Dong Mohanraj Kumar Jih-Hsing Chang |
| author_facet | Chien-Hung Huang Shan-Yi Shen Cheng-Di Dong Mohanraj Kumar Jih-Hsing Chang |
| author_sort | Chien-Hung Huang |
| collection | DOAJ |
| description | This study aims to clarify the removal mechanism and to calculate the effective current of electrocoagulation (i.e., EC) for treating wastewater containing Ni(II), Cu(II), and Cr(VI). The adsorption behavior of various heavy metals onto Al(OH)<sub>3</sub> coagulant generated by the EC process was investigated and the estimating method of the corresponding current was established. Results indicate that adsorption of single Ni(II) and Cu(II) by Al(OH)<sub>3</sub> coagulant can be simulated by the Langmuir isotherm, while Cr(VI) adsorption fits the Freundlich isotherm better. As treating single heavy metal of wastewater, the removal mechanism of the EC process is the adsorption reaction. Under the coexisting condition, the Ni(II) and Cu(II) will compete for the same active sites on the Al(OH)<sub>3</sub> surface and Cu(II) suppresses Ni(II) adsorption. As treating the coexisting heavy metals, Ni(II) removal not only associates with adsorption but also with the coprecipitation. In contrast, Cr(VI) does not compete with other metal ions for the same type of adsorption sites. Whether single or coexisting conditions, the adsorption capacity of heavy metals onto Al(OH)<sub>3</sub> coagulants can be used to compute the necessary current to effectively remove heavy metals in the EC system. |
| first_indexed | 2024-03-10T16:13:25Z |
| format | Article |
| id | doaj.art-3a1835a5f01b4406b8cff7c8786b1a48 |
| institution | Directory Open Access Journal |
| issn | 2073-4441 |
| language | English |
| last_indexed | 2024-03-10T16:13:25Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Water |
| spelling | doaj.art-3a1835a5f01b4406b8cff7c8786b1a482023-11-20T14:12:40ZengMDPI AGWater2073-44412020-09-01129261410.3390/w12092614Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI)Chien-Hung Huang0Shan-Yi Shen1Cheng-Di Dong2Mohanraj Kumar3Jih-Hsing Chang4Department of Health Wellness and Marketing, Kainan University, Taoyuan 33857, TaiwanDepartment of Environmental Engineering and Management, Chaoyang University of Technology, 168, Jifeng E. Rd., Taichung 41349, TaiwanDepartment of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung 81157, TaiwanDepartment of Environmental Engineering and Management, Chaoyang University of Technology, 168, Jifeng E. Rd., Taichung 41349, TaiwanDepartment of Environmental Engineering and Management, Chaoyang University of Technology, 168, Jifeng E. Rd., Taichung 41349, TaiwanThis study aims to clarify the removal mechanism and to calculate the effective current of electrocoagulation (i.e., EC) for treating wastewater containing Ni(II), Cu(II), and Cr(VI). The adsorption behavior of various heavy metals onto Al(OH)<sub>3</sub> coagulant generated by the EC process was investigated and the estimating method of the corresponding current was established. Results indicate that adsorption of single Ni(II) and Cu(II) by Al(OH)<sub>3</sub> coagulant can be simulated by the Langmuir isotherm, while Cr(VI) adsorption fits the Freundlich isotherm better. As treating single heavy metal of wastewater, the removal mechanism of the EC process is the adsorption reaction. Under the coexisting condition, the Ni(II) and Cu(II) will compete for the same active sites on the Al(OH)<sub>3</sub> surface and Cu(II) suppresses Ni(II) adsorption. As treating the coexisting heavy metals, Ni(II) removal not only associates with adsorption but also with the coprecipitation. In contrast, Cr(VI) does not compete with other metal ions for the same type of adsorption sites. Whether single or coexisting conditions, the adsorption capacity of heavy metals onto Al(OH)<sub>3</sub> coagulants can be used to compute the necessary current to effectively remove heavy metals in the EC system.https://www.mdpi.com/2073-4441/12/9/2614adsorptionaluminum hydroxideelectrocoagulationheavy-metal wastewater |
| spellingShingle | Chien-Hung Huang Shan-Yi Shen Cheng-Di Dong Mohanraj Kumar Jih-Hsing Chang Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI) Water adsorption aluminum hydroxide electrocoagulation heavy-metal wastewater |
| title | Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI) |
| title_full | Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI) |
| title_fullStr | Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI) |
| title_full_unstemmed | Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI) |
| title_short | Removal Mechanism and Effective Current of Electrocoagulation for Treating Wastewater Containing Ni(II), Cu(II), and Cr(VI) |
| title_sort | removal mechanism and effective current of electrocoagulation for treating wastewater containing ni ii cu ii and cr vi |
| topic | adsorption aluminum hydroxide electrocoagulation heavy-metal wastewater |
| url | https://www.mdpi.com/2073-4441/12/9/2614 |
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