Coupling effects of surface charges, adsorbed counterions and particle‐size distribution on soil water infiltration and transport

Gong, Yafeng; Tian, Rui; Li, H.

doi:10.1111/ejss.12721

Cited by 31 publications

(13 citation statements)

References 31 publications

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“…Firstly, the PAinstantaneous polarized in the electric field, which was formed near the saponite particles due to the surface charge. Then, it enters the saponite hydration layer to replace some of the original hydrated ions (Gong et al, 2018). Further, a strong chemical bond formed between the polarized PAand the saponite particles due to stronger electrostatic attraction (Fig.…”

Section: Saponite and Hectoritementioning

confidence: 99%

Interactions between smectites and polyelectrolytes

Shen

Petit

et al. 2020

Applied Clay Science

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Interactions between smectite and polyelectrolyte play an essential role in exclusive adsorption, flocculation, and thixotropic properties of aqueous smectite/polyelectrolyte system.The materials are widely used in many industries such as drilling fluids, pharmaceuticals, paints and dyes, ceramics, papermaking and water treatment. This review focuses on the interaction between different types of polyelectrolytes and smectite, and their applications in flocculation and industrial wastewaters. The effect of several parameters related to polyelectrolyte such as charge density, charge type and molecular weight, as well as to smectite such as type, particle size, composition, pH and concentration in the aqueous system, were examined. The interactive forces between smectite and polyelectrolyte including hydrophobic interaction, ion binding, hydrogen bonding, van der Waals forces and electrostatic were thoroughly discussed. The interactive forces between smectite and cationic polyelectrolyte, anionic polyelectrolyte and amphoteric polyelectrolyte influence the flocculation of colloidal smectite-polyelectrolyte dispersions such as settling and floc dispersion. However, the interaction between smectites and polyelectrolytes and their subsequent behaviors in adsorption, flocculation, and thixotropy along with inherent mechanisms have not yet fully understood. Future in-depth work on interactions between smectites and polyelectrolytes has great implications for developing functional materials and expanding applications of other polyelectrolyte/ smectite mineral system.

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Section: Saponite and Hectoritementioning

confidence: 99%

Interactions between smectites and polyelectrolytes

Shen

Petit

et al. 2020

Applied Clay Science

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“…The interaction forces among soil particles control aggregation and breakdown/dispersion processes, which further affect soil aggregate stability, pore stability, water movement and erosion strength under rainfall (Xu et al, 2015; Hu et al, 2015; Li et al, 2015; Yu, Liu, Xu, Xiong, & Li, 2016; Gong, Tian, & Li, 2018; Luo, Li, Ding, Hu, & Li, 2018). A quantitative description of soil particle interaction forces is critical to unravel the physical mechanisms for a series of macro‐processes occurring in soil systems.…”

Section: Introductionmentioning

confidence: 99%

“…It is well known that the dispersive potential for clay aggregates obeys an order of Na + > K + ≈ NH 4 + > Mg 2+ > Ca 2+ (Marchuk & Marchuk, 2018). Recent studies have indicated that ionic non‐classical polarization induced by the electric field arising from surface charges, could significantly reduce the electrostatic repulsive force among soil particles (Li et al, 2015; Xu et al, 2015; Yu et al, 2016; Gong et al, 2018; Luo, Li, Ding, et al, 2018). However, according to the DLVO theory, the van der Waals attractive force among soil particles should be nearly independent of the surface reactions and electrolyte conditions.…”

Section: Introductionmentioning

confidence: 99%

Method to determine van der Waals potential energy of particle interactions for soil clay by dynamic light scattering

Shi

Yang

2021

European J Soil Science

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Soil particle interaction forces/energies control aggregation and breakup/dispersion processes, which further profoundly affect a series of soil micro‐ and macro‐processes. For soils with complex compositions, it is the interaction energy of different particles that determines particle aggregation and aggregate breakdown/dispersion. However, measuring the interaction energy for complex systems remains a challenge. In this study we proposed a method to measure this van der Waals potential energy using the dynamic light scattering technique. Firstly, the mathematic relationship between the mean aggregation rate and van der Waals potential energy was established. The mean aggregation rates of particles for either simple or complex systems can be facilely determined by the dynamic light scattering technique. Secondly, for verifying the availability of the suggested method, montmorillonite suspensions in four different electrolyte solutions (NaCl, KCl, MgCl2 and CaCl2) were respectively employed to measure the van der Waals potential energy, which equals −17,817 ± 857 J mol−1 or −7.22 ± 0.304 kT with an average deviation of 4.22%; this directly verified the reliability of the suggested method. Thirdly, the proposed method was also verified indirectly and independently by the ratio of the electrostatic potential energy of particles to the presence of K+ and Na+, as compared with the ratios from the determined van der Waals potential energy of this study and from cation adsorption selectivity. Considering the dynamic light scattering technique has been widely applied for characterizing soil/clay/humus/microbe aggregation, the proposed method should be appropriate for measuring the van der Waals potential energy for all those systems. Highlights Develop a simple method to measure the mean interaction energy for complex systems. The mathematic relationship between the mean aggregation rate and van der Waals energy was established. A method to measure the van der Waals potential energy using the dynamic light scattering technique has been proposed. The van der Waals potential energy in the soil system can be measured in different electrolyte solutions and KCl might be the best one.

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“…These interactions are determined by solid-liquid interactions, including ion adsorption and ion exchange. The stability of the soil structure will affect the transport of solutes and water as well as the dispersion process of soil particles, and further large losses of soil water and nutrients may cause soil erosion and agricultural non-point source pollution (Gong, Tian, & Li, 2018;Yu et al, 2020). Therefore, microscopic processes such as ion adsorption at the solid-liquid interface may determine the macroscopic performance of soils to a certain extent.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of cations at the illite–water interface and its effect on intrinsic potassium ions

Xing

Tang

et al. 2021

European J Soil Science

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Na + , K + , Cs + and Ca 2+ are common exogenous cations that could be introduced into soils either via long-term tillage with inorganic fertilizers or the leakage of nuclear waste. However, the manner in which they co-adsorb and compete with the intrinsic potassium ions in illite, the response of intrinsic potassium (K 0+ ), as well as the underlying mechanisms of these interactions, remain unclear. These aspects were explored using molecular dynamics simulations based on a series of concentrations. Because of the competition between exogenous cations and K 0+ , the number of adsorbed exogenous cations such as Na + increased by 11.2, whereas the corresponding number of adsorbed potassium decreased by 14.2, with the increase in concentration from 0.1 to 1.0 molÁL À1 , indicating that long-term application of inorganic fertilizers tends to promote the release of intrinsic potassium. This was further validated from the increased adsorption free energy of IS (inner-sphere) K 0+ , which increased from À54.3 kJÁmol À1 (0.1 molÁL À1 ) to À42.9 kJÁmol À1 (1.0 molÁL À1 ). The stability of both exogenous cations and intrinsic potassium decreased with the increase in concentration. This was mainly caused by the reduction of illite-cation interactions, as evidenced by the radial distribution function analysis. Nonetheless, intrinsic potassium always dominated the competition, as its abundance was lower than that of exogenous cations only beyond 0.7 molÁL À1 . Different exogenous cations exerted diverse effects on the intrinsic potassium and may vary with the concentration, as reflected by the distribution, adsorption number, coordination environment and adsorption stability.Generally, the effect of exogenous cations on intrinsic potassium decreased as Ca 2+ > Na + > Cs + , which may have been caused by the different adsorption sites. These results provide new insight into the environmental effect of the excessive use of inorganic fertilizers and the leakage of radioactive waste in soils. Highlights• Increase in exogenous cations tended to promote the release of intrinsic potassium in illite.

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Coupling effects of surface charges, adsorbed counterions and particle‐size distribution on soil water infiltration and transport

Cited by 31 publications

References 31 publications

Interactions between smectites and polyelectrolytes

Interactions between smectites and polyelectrolytes

Method to determine van der Waals potential energy of particle interactions for soil clay by dynamic light scattering

Adsorption of cations at the illite–water interface and its effect on intrinsic potassium ions

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