Macroscopic and molecular scale assessment of thermal effects on soil-water interactions of unsaturated diesel-contaminated soils
文献类型：期刊论文
| 作者 | Wei, Wei1,2,3,4; Wei, Mingli1,5; Li, Yuan6; Xue, Qiang1,3,4 ; Liu, Lei1,3,4; Wan, Yong1,3,4
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| 刊名 | SCIENCE OF THE TOTAL ENVIRONMENT
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| 出版日期 | 2024-11-15 |
| 卷号 | 951页码:15 |
| 关键词 | Soil-water interactions Matric suction Temperature Pollutant concentration Organic contaminated kaolin Molecular dynamics simulation |
| ISSN号 | 0048-9697 |
| DOI | 10.1016/j.scitotenv.2024.175695 |
| 英文摘要 | The soil-water interactions of unsaturated diesel-contaminated soil are crucial for assessing pollution transport during thermal remediation. This paper aims to improve our understanding of this issue by measuring the matric suction of unsaturated contaminated kaolin and carrying out molecular dynamics simulations under thermal conditions. Results show that the increase in pollutant concentration could reduce the water retention capacity of diesel-contaminated kaolin due to changes in electrochemical properties and pore characteristics of samples, as well as a decrease in interfacial tension. On the other hand, pollutants formed a protective film on the kaolinite surface to act as a liquid bridge and prevent water loss at higher temperatures, as confirmed by Fourier transform infrared spectroscopy. With rising temperatures (50-60 degrees C), kaolin matric suction generally decreased with higher pollutant concentrations, but this trend was not very evident at lower pollution concentrations (0-10,000 mg/kg). In addition, molecular dynamics simulations were used to demonstrate the validity of these findings. The presence of pollutants might strengthen the interaction energy between kaolinite and water (for example, increasing from 276.52 kcal/mol (25 degrees C) and 267.95 kcal/mol (40 degrees C) at 8000 mg/kg to 296.54 kcal/mol (25 degrees C) and 292.46 kcal/mol (40 degrees C) at 10,000 mg/kg), thereby enhancing the water retention capacity of kaolin. In short, the study revealed that the coating of pollutants on kaolinite could act as a protective film, which binds water molecules through van der Waals and electric field forces and thereby reduces the sensitivity of water retention capacity to temperature. |
| 资助项目 | Institute of Rock and Soil Mechanics, Chinese Academy of Sciences[SKLGME023006] ; Key Plan Project of Science and Technology of Wenzhou[ZS2021001] |
| WOS研究方向 | Environmental Sciences & Ecology |
| 语种 | 英语 |
| WOS记录号 | WOS:001302917200001 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.198/handle/2S6PX9GI/42433]  |
| 专题 | 中科院武汉岩土力学所 |
| 通讯作者 | Wei, Mingli; Xue, Qiang |
| 作者单位 | 1.Chinese Acad Sci, Inst Rock & Soil Mech, State Key Lab Geomech & Geotech Engn, Wuhan 430071, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.IRSM CAS, HK Poly U Joint Lab Solid Waste Sci, Wuhan 430071, Peoples R China 4.Hubei Prov Key Lab Contaminated Sludge & Soil Sci, Wuhan 430071, Peoples R China 5.Jiangsu Inst Zoneco Co Ltd, Yixing 214200, Peoples R China 6.Hong Kong Polytech Univ, Dept Civil & Environm Engn, Hong Kong, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wei, Wei,Wei, Mingli,Li, Yuan,et al. Macroscopic and molecular scale assessment of thermal effects on soil-water interactions of unsaturated diesel-contaminated soils[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2024,951:15. |
| APA | Wei, Wei,Wei, Mingli,Li, Yuan,Xue, Qiang,Liu, Lei,&Wan, Yong.(2024).Macroscopic and molecular scale assessment of thermal effects on soil-water interactions of unsaturated diesel-contaminated soils.SCIENCE OF THE TOTAL ENVIRONMENT,951,15. |
| MLA | Wei, Wei,et al."Macroscopic and molecular scale assessment of thermal effects on soil-water interactions of unsaturated diesel-contaminated soils".SCIENCE OF THE TOTAL ENVIRONMENT 951(2024):15. |
入库方式： OAI收割
来源：武汉岩土力学研究所
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