On the nanoparticle transport and release in layered heterogeneous porous media under transient chemical conditions

Liu，Jin1; Zeng，Xiankui1; Ma，Enze2,3,4; Wu，Jichun1; Zhang，You Kuan2,3,4; Sun，Yuanyuan1; Liang，Xiuyu2,3,4; Zheng，Chunmiao2,3

2020-07-01

10.1016/j.jhydrol.2020.124889

JOURNAL OF HYDROLOGY   影响因子和分区

0022-1694

1879-2707

The rapid increase in production and application of nanoparticles (NPs) across a wide range of commercial and industrial processes has resulted in the extensive invasion of NPs into subsurface environments. Accurately predicting the transport and release of NPs in subsurface environments is important for assessing a wide range of environmental and human health risks. In this study, a two-dimensional NP transport and release model was proposed to investigate the behavior of NPs in a layered heterogeneous medium with transient ionic strength (IS). The layered heterogeneous porous medium comprised a slow flow domain (SFD) and a fast flow domain (FFD). The transport of NPs in the two layers was described by two coupled advection–dispersion equations (ADEs). The NP deposition and release were related to the IS of the electrolyte solution (ES) in the medium and were represented by reversible and irreversible deposition terms in the ADEs. The results indicated that heterogeneity has a significant impact on the transport and release of NPs. When NPs pass through the two‐layer medium, initially part of the NPs in the FFD will migrate into the SFD. A larger amount of NPs are deposited in the SFD than the FFD owing to the higher filtration capacity of the SFD. The retained NPs in both the SFD and FFD will be released when the IS declines. The release of the retained NPs in the FFD is faster than that in the SFD because the FFD has a higher intrinsic release rate and lower IS owing to the more rapid transport of ES in the FFD. The proposed model was applied to laboratory experiments and compared to the double-region model. The proposed model fitted the experimental breakthrough curves better than the double-region model, and it is capable of fitting the release of NPs, which cannot be accomplished with the double-region model.

Layered heterogeneous media Nanoparticle transport and release Numerical model

SCI ; EI

英语

其他

National Natural Science Foundation of China[41730856][41977165][41830861]

Engineering ; Geology ; Water Resources

Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources

WOS:000544258100050

ELSEVIER

20201408373727

Health risks ; Porous materials ; Risk assessment ; Electrolytes ; Deposition ; Curve fitting ; Ionic strength

Health Care:461.7 ; Electric Batteries and Fuel Cells:702 ; Nanotechnology:761 ; Physical Chemistry:801.4 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Accidents and Accident Prevention:914.1 ; Numerical Methods:921.6 ; Solid State Physics:933 ; Materials Science:951

ENGINEERING

2-s2.0-85082507681

Scopus

1.Key Laboratory of Surficial Geochemistry,Ministry of Education,School of Earth Sciences and Engineering,Nanjing University,Nanjing,China
2.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.State Environmental Protection Key Laboratory of Integrated Surface Water-Groundwater Pollution Control,School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
4.Shenzhen Municipal Engineering Lab of Environmental IoT Technologies,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Jin,Zeng，Xiankui,Ma，Enze,et al. On the nanoparticle transport and release in layered heterogeneous porous media under transient chemical conditions[J]. JOURNAL OF HYDROLOGY,2020,586.

Liu，Jin.,Zeng，Xiankui.,Ma，Enze.,Wu，Jichun.,Zhang，You Kuan.,...&Zheng，Chunmiao.(2020).On the nanoparticle transport and release in layered heterogeneous porous media under transient chemical conditions.JOURNAL OF HYDROLOGY,586.

Liu，Jin,et al."On the nanoparticle transport and release in layered heterogeneous porous media under transient chemical conditions".JOURNAL OF HYDROLOGY 586(2020).