Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio
The main purpose of this work was to study a new method for evaluating the solidification of contaminated soil based on electrochemical impedance spectroscopy (EIS). To explore how the EIS parameters were affected by the pore structure and mesostructure of the cured system, the physical and mechanic...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Heliyon |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2405844022022599 |
| _version_ | 1811192426544496640 |
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| author | Wang Wen Lijun Jia Jun Xie Wenjing Zhao Huimin Feng Dehua Cao Funan Sun Pengju Han Xiaohong Bai Bin He |
| author_facet | Wang Wen Lijun Jia Jun Xie Wenjing Zhao Huimin Feng Dehua Cao Funan Sun Pengju Han Xiaohong Bai Bin He |
| author_sort | Wang Wen |
| collection | DOAJ |
| description | The main purpose of this work was to study a new method for evaluating the solidification of contaminated soil based on electrochemical impedance spectroscopy (EIS). To explore how the EIS parameters were affected by the pore structure and mesostructure of the cured system, the physical and mechanical properties, leaching toxicity, microstructure, and EIS of the stabilized contaminated soil were tested after 7, 28, 60, and 90 days of curing. Based on the EIS results, a physical and equivalent circuit model of the stabilized contaminated soil's impedance response was established to reveal the mechanism of binder-heavy metal ion-soil interaction. The results showed that as the red mud (RM)-fly ash (FA) mass ratio and curing age increased, the strength and structural compactness of the solidified body also increased. The best curing effect was achieved with an RM-FA mass ratio of 7:3 after curing for 90 days. The equivalent circuit model of the solidified body obtained by EIS was Rs (Q1 (Rct1W) Q2Rct2). The pore solution resistance Rs, solid-liquid interface ion transfer resistance Rct 1, and unconfined compressive strength (UCS) qu all showed an increasing trend with increasing RM-FA mass ratio and increasing curing time. Fitting the model demonstrated that both Rs and Rct1 were closely correlated with the strength of the solidified bodies. These conclusions were further verified by scanning electron microscope (SEM) experiments. Overall, this work demonstrates that the strength characteristics of solidified bodies can be evaluated by EIS and reveals the microscopic mechanism of the solidification of Cu2+-contaminated soil. |
| first_indexed | 2024-04-11T23:52:34Z |
| format | Article |
| id | doaj.art-06cb43227bd94482be3f7c3578d474ac |
| institution | Directory Open Access Journal |
| issn | 2405-8440 |
| language | English |
| last_indexed | 2024-04-11T23:52:34Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Heliyon |
| spelling | doaj.art-06cb43227bd94482be3f7c3578d474ac2022-12-22T03:56:26ZengElsevierHeliyon2405-84402022-10-01810e10971Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratioWang Wen0Lijun Jia1Jun Xie2Wenjing Zhao3Huimin Feng4Dehua Cao5Funan Sun6Pengju Han7Xiaohong Bai8Bin He9College of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Shan'an Lide Environmental Science and Technology Co., Ltd, Taiyuan 030032, ChinaCollege of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaShanxi Shan'an Lide Environmental Science and Technology Co., Ltd, Taiyuan 030032, ChinaShanxi Shan'an Lide Environmental Science and Technology Co., Ltd, Taiyuan 030032, ChinaShanxi Shan'an Lide Environmental Science and Technology Co., Ltd, Taiyuan 030032, ChinaCollege of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, ChinaCollege of Civil Engineering, Taiyuan University of Technology, Taiyuan 030024, China; Corresponding author.The main purpose of this work was to study a new method for evaluating the solidification of contaminated soil based on electrochemical impedance spectroscopy (EIS). To explore how the EIS parameters were affected by the pore structure and mesostructure of the cured system, the physical and mechanical properties, leaching toxicity, microstructure, and EIS of the stabilized contaminated soil were tested after 7, 28, 60, and 90 days of curing. Based on the EIS results, a physical and equivalent circuit model of the stabilized contaminated soil's impedance response was established to reveal the mechanism of binder-heavy metal ion-soil interaction. The results showed that as the red mud (RM)-fly ash (FA) mass ratio and curing age increased, the strength and structural compactness of the solidified body also increased. The best curing effect was achieved with an RM-FA mass ratio of 7:3 after curing for 90 days. The equivalent circuit model of the solidified body obtained by EIS was Rs (Q1 (Rct1W) Q2Rct2). The pore solution resistance Rs, solid-liquid interface ion transfer resistance Rct 1, and unconfined compressive strength (UCS) qu all showed an increasing trend with increasing RM-FA mass ratio and increasing curing time. Fitting the model demonstrated that both Rs and Rct1 were closely correlated with the strength of the solidified bodies. These conclusions were further verified by scanning electron microscope (SEM) experiments. Overall, this work demonstrates that the strength characteristics of solidified bodies can be evaluated by EIS and reveals the microscopic mechanism of the solidification of Cu2+-contaminated soil.http://www.sciencedirect.com/science/article/pii/S2405844022022599Cu2+-contaminated soilCuring agentUnconfined compressive strengthElectrochemical impedance spectroscopyMicrostructure |
| spellingShingle | Wang Wen Lijun Jia Jun Xie Wenjing Zhao Huimin Feng Dehua Cao Funan Sun Pengju Han Xiaohong Bai Bin He Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio Heliyon Cu2+-contaminated soil Curing agent Unconfined compressive strength Electrochemical impedance spectroscopy Microstructure |
| title | Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio |
| title_full | Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio |
| title_fullStr | Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio |
| title_full_unstemmed | Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio |
| title_short | Electrochemical response of solidification Cu2+ contaminated soil influenced by red mud/fly ash ratio |
| title_sort | electrochemical response of solidification cu2 contaminated soil influenced by red mud fly ash ratio |
| topic | Cu2+-contaminated soil Curing agent Unconfined compressive strength Electrochemical impedance spectroscopy Microstructure |
| url | http://www.sciencedirect.com/science/article/pii/S2405844022022599 |
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