Study on cadmium retardation by guar gum modified bentonite barrier wall
This study evaluates the barrier properties of a novel wall composed of guar gum-modified bentonite and powdery clay. Using macro and micro testing, the fundamental characteristics of the barrier materials were examined. Permeability, batch adsorption and column tests were performed to evaluate the...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-01-01
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| Series: | Desalination and Water Treatment |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1944398624002406 |
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| _version_ | 1849717064820850688 |
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| author | Changsheng Tian Xiao Wang Fengshu Sun Shuangshuang Wu Qi Jiang Kaiyi Ji Ru Li |
| author_facet | Changsheng Tian Xiao Wang Fengshu Sun Shuangshuang Wu Qi Jiang Kaiyi Ji Ru Li |
| author_sort | Changsheng Tian |
| collection | DOAJ |
| description | This study evaluates the barrier properties of a novel wall composed of guar gum-modified bentonite and powdery clay. Using macro and micro testing, the fundamental characteristics of the barrier materials were examined. Permeability, batch adsorption and column tests were performed to evaluate the seepage properties, the Cd(II) adsorption capacity and transport parameters of the soils. The data indicates that a 10% of modified bentonite in the barrier wall is optimal, resulting in the highest impermeability with a permeability coefficient of 3.84 × 10−10 m/s and good chemical compatibility. The experimental data were analyzed using Langmuir, Freundlich, and D-R isotherm models. The Freundlich isotherm model provided the best fit for the experimental data. The maximum adsorption capacity of the Langmuir isotherm model was 195.05 mg/kg. The diffusion test revealed a negative correlation between the diffusion degree of Cd2+ in the soil column and the dosage of modified bentonite. The diffusion coefficient can reach 1.81 × 10−10 m/s. This study demonstrates that modification with guar gum reduces permeability and increases barrier capacity, providing a basis for designing heavy metal pollutant barrier walls optimally. |
| format | Article |
| id | doaj-art-0fc3caba26b24ca5bd2bf624ba25b354 |
| institution | DOAJ |
| issn | 1944-3986 |
| language | English |
| publishDate | 2024-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Desalination and Water Treatment |
| spelling | doaj-art-0fc3caba26b24ca5bd2bf624ba25b3542025-08-20T03:12:47ZengElsevierDesalination and Water Treatment1944-39862024-01-0131710021210.1016/j.dwt.2024.100212Study on cadmium retardation by guar gum modified bentonite barrier wallChangsheng Tian0Xiao Wang1Fengshu Sun2Shuangshuang Wu3Qi Jiang4Kaiyi Ji5Ru Li6School of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, PR ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, PR ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, PR ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, PR ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, PR ChinaSchool of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, PR ChinaCorresponding author.; School of Resources and Civil Engineering, Northeastern University, Shenyang, Liaoning 110819, PR ChinaThis study evaluates the barrier properties of a novel wall composed of guar gum-modified bentonite and powdery clay. Using macro and micro testing, the fundamental characteristics of the barrier materials were examined. Permeability, batch adsorption and column tests were performed to evaluate the seepage properties, the Cd(II) adsorption capacity and transport parameters of the soils. The data indicates that a 10% of modified bentonite in the barrier wall is optimal, resulting in the highest impermeability with a permeability coefficient of 3.84 × 10−10 m/s and good chemical compatibility. The experimental data were analyzed using Langmuir, Freundlich, and D-R isotherm models. The Freundlich isotherm model provided the best fit for the experimental data. The maximum adsorption capacity of the Langmuir isotherm model was 195.05 mg/kg. The diffusion test revealed a negative correlation between the diffusion degree of Cd2+ in the soil column and the dosage of modified bentonite. The diffusion coefficient can reach 1.81 × 10−10 m/s. This study demonstrates that modification with guar gum reduces permeability and increases barrier capacity, providing a basis for designing heavy metal pollutant barrier walls optimally.http://www.sciencedirect.com/science/article/pii/S1944398624002406BentoniteGuar gumAdsorptionPermeability: column test |
| spellingShingle | Changsheng Tian Xiao Wang Fengshu Sun Shuangshuang Wu Qi Jiang Kaiyi Ji Ru Li Study on cadmium retardation by guar gum modified bentonite barrier wall Desalination and Water Treatment Bentonite Guar gum Adsorption Permeability: column test |
| title | Study on cadmium retardation by guar gum modified bentonite barrier wall |
| title_full | Study on cadmium retardation by guar gum modified bentonite barrier wall |
| title_fullStr | Study on cadmium retardation by guar gum modified bentonite barrier wall |
| title_full_unstemmed | Study on cadmium retardation by guar gum modified bentonite barrier wall |
| title_short | Study on cadmium retardation by guar gum modified bentonite barrier wall |
| title_sort | study on cadmium retardation by guar gum modified bentonite barrier wall |
| topic | Bentonite Guar gum Adsorption Permeability: column test |
| url | http://www.sciencedirect.com/science/article/pii/S1944398624002406 |
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