SCI和EI收录∣中国化工学会会刊

中国化学工程学报 ›› 2023, Vol. 61 ›› Issue (9): 147-156.DOI: 10.1016/j.cjche.2023.02.015

• Full Length Article • 上一篇    下一篇

Influence of mineral species on oil–soil interfacial interaction in petroleum-contaminated soils

Yang Yang1,2, Dandan Liu1,2, Xing Liang1,2, Xiaobing Li1   

  1. 1. National Center for Coal Preparation and Purification Engineering Research, China University of Mining and Technology, Xuzhou 221116, China;
    2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
  • 收稿日期:2022-10-31 修回日期:2023-02-06 出版日期:2023-09-28 发布日期:2023-12-14
  • 通讯作者: Xiaobing Li,E-mail:Xiaobing.li@cumt.edu.cn
  • 基金资助:
    This work was supported by the National Key Research and Development Program of China (2019YFE0115600) and the National Natural Science Foundation of China (52074290).

Influence of mineral species on oil–soil interfacial interaction in petroleum-contaminated soils

Yang Yang1,2, Dandan Liu1,2, Xing Liang1,2, Xiaobing Li1   

  1. 1. National Center for Coal Preparation and Purification Engineering Research, China University of Mining and Technology, Xuzhou 221116, China;
    2. School of Chemical Engineering and Technology, China University of Mining and Technology, Xuzhou 221116, China
  • Received:2022-10-31 Revised:2023-02-06 Online:2023-09-28 Published:2023-12-14
  • Contact: Xiaobing Li,E-mail:Xiaobing.li@cumt.edu.cn
  • Supported by:
    This work was supported by the National Key Research and Development Program of China (2019YFE0115600) and the National Natural Science Foundation of China (52074290).

摘要: The mineral species in soils vary in a wide variety of places, thus resulting in the petroleum-contaminated soil (PCS) with complex characters. Thus, the research on the effect of mineral species on oil-soil interactions in PCS takes on a critical significance. In this study, the desorption and adsorption behaviors of aromatic hydrocarbons (Ar) on two minerals surfaces were examined. Meanwhile, the interfacial forces between minerals and Ar were studied and the sources of these forces were analyzed. Moreover, molecular dynamics (MD) simulations were conducted to gain insight into the interfacial interaction mechanisms. As revealed by the results of this study, in comparison with Qs–Ar (quartz sand, Qs), Mnt–Ar (montmorillonite, Mnt) contaminants required higher temperature and activation energies for thermal desorption (201.95 kJ·mol-1 vs. 127.82 kJ·mol-1). The above difference was generated since the adhesive forces between Ar and Mnt surfaces were greater than those between Ar and Qs. As indicated by the analysis of the adhesion force sources, the van der Waals forces were responsible for facilitating oil adhesion to mineral surfaces, even though the electrostatic force prevented oil–mineral adhesion. Furthermore, the hydrophobic forces facilitated adhesion in 3 nm. The MD results demonstrated that compared with the Qs system, there existed larger binding energies between Ar and Mnt, a lower diffusion coefficient for Ar on the Mnt surface, as well as more significant adsorption of Ar on Mnt. In general, the different mineral species affect the strength of the interaction at the oil–soil interface, which is a guideline for proposing targeted oil-soil separation measures.

关键词: Oil–soil interface, Thermal desorption, Isothermal adsorption, Extended-DLVO (EDLVO), Molecular dynamics

Abstract: The mineral species in soils vary in a wide variety of places, thus resulting in the petroleum-contaminated soil (PCS) with complex characters. Thus, the research on the effect of mineral species on oil-soil interactions in PCS takes on a critical significance. In this study, the desorption and adsorption behaviors of aromatic hydrocarbons (Ar) on two minerals surfaces were examined. Meanwhile, the interfacial forces between minerals and Ar were studied and the sources of these forces were analyzed. Moreover, molecular dynamics (MD) simulations were conducted to gain insight into the interfacial interaction mechanisms. As revealed by the results of this study, in comparison with Qs–Ar (quartz sand, Qs), Mnt–Ar (montmorillonite, Mnt) contaminants required higher temperature and activation energies for thermal desorption (201.95 kJ·mol-1 vs. 127.82 kJ·mol-1). The above difference was generated since the adhesive forces between Ar and Mnt surfaces were greater than those between Ar and Qs. As indicated by the analysis of the adhesion force sources, the van der Waals forces were responsible for facilitating oil adhesion to mineral surfaces, even though the electrostatic force prevented oil–mineral adhesion. Furthermore, the hydrophobic forces facilitated adhesion in 3 nm. The MD results demonstrated that compared with the Qs system, there existed larger binding energies between Ar and Mnt, a lower diffusion coefficient for Ar on the Mnt surface, as well as more significant adsorption of Ar on Mnt. In general, the different mineral species affect the strength of the interaction at the oil–soil interface, which is a guideline for proposing targeted oil-soil separation measures.

Key words: Oil–soil interface, Thermal desorption, Isothermal adsorption, Extended-DLVO (EDLVO), Molecular dynamics