Co-transport of U(VI) and gibbsite colloid in saturated granite particle column: Role of pH, U(VI) concentration and humic acid

Yang, Junwei; Zhang, Zhen; Chen, Zongyuan; Ge, Mengtuan; Wu, Wangsuo; Guo, Zhijun

doi:10.1016/j.scitotenv.2019.05.395

Cited by 40 publications

(5 citation statements)

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“…The distinct properties of 2:1 type clay minerals (Mt) and 1:1 type clay minerals (Ka) will cause different aggregation/dispersion characteristics. It has been confirmed that the interactions between clay mineral particles significantly affect the stability of soil aggregates (Hu et al, 2015; J. Liu et al, 2021; Yu et al, 2020), water movement (Gong et al, 2018; Yu et al, 2016) and the migration of clay minerals and contaminants (Ma et al, 2019; Yang et al, 2019). The quantitative evaluation of Hofmeister effects on the aggregation of different types of clay mineral is therefore of great significance in the study of earth ecology and environment.…”

Section: Introductionmentioning

confidence: 95%

Insight into Hofmeister effects on aggregation of 2:1 and 1:1 type clay minerals

Zhang

Tian

Liu

et al. 2022

European J Soil Science

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2:1 and 1:1 types of clay minerals are ubiquitous in soil, and their different surface properties result in distinct environmental behaviours. In this study, dynamic light scattering (DLS) technology was adopted to determine the aggregation kinetics of 2:1 type (Montmorillonite [Mt]) and 1:1 type (Kaolinite [Ka]) clay minerals in different electrolytes. Hofmeister effects on their aggregation characteristics and mechanisms were explored. The results showed that the activation energy and critical coagulation concentration (CCC) for Mt and Ka aggregation followed Hofmeister sequences of Na+ > K+ > Cs+, Mg2+ > Ca2+ > Zn2+ ≈ Cd2+ > Cu2+> Pb2+. The analyses of physical insights into those differences revealed that the observed Hofmeister sequence was produced from the different non‐classical polarisation of cations and surface O atoms in the strong electric field of clay, which led to non‐electrostatic force adsorption of cations at the surface (or in the Stern layer). In this study, the effective charge coefficient γ was employed to characterise the intensity of the non‐electrostatic adsorption forces of cations arising from the non‐classical polarisation, and the γ values followed Na+ < K+ < Cs+, Mg2+ < Ca2+ < Zn2+ = Cd2+ < Cu2+ < Pb2+. For alkali and alkali earth metal cations with same valence, the more the electron layers, the ‘softer’ the electron cloud, the stronger the non‐classical polarisation effects in the electric field and the stronger ability to shield the electric field around the particle, which finally lead to the larger γ and lower CCC for clay minerals aggregation. For heavy metal cations, different s/p/d empty orbitals provided the basis for the difference in polarisation‐induced coordination between heavy metal cations with surface O atoms on clay. The results also showed that, the Hofmeister effects on Mt/Ka aggregation were different, it was from the differences in Hamaker constant and surface charge density for the two clay minerals. Highlights Mt and Ka aggregations exhibited different Hofmeister effects. Repulsive force among Mt particles was much larger than Ka. Cationic polarisation played critical role in particle interactions of Mt. Polarisation‐induced covalent adsorption of cations was observed at Mt surface.

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Section: Introductionmentioning

confidence: 95%

Insight into Hofmeister effects on aggregation of 2:1 and 1:1 type clay minerals

Zhang

Tian

Liu

et al. 2022

European J Soil Science

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“…Soil particles with a size smaller than 2 μm, which is the most active part of the soil, account for about 80% of the specific surface area and 85% of the surface charge of soil (Liu et al, 2018a;Liu et al, 2019b;Tang, Li, Liu, Zhu, & Tian, 2015). The interaction between soil particles affects the stability of soil aggregates (Hu et al, 2015a;Nguetnkam & Dultz, 2014;Pham, Ishiguro, Tran, & Sato, 2014;Yu et al, 2020), soil water movement (Gong, Tian, & Li, 2018;Yu, Li, Liu, Xu, & Xiong, 2016), soil erosion (Li et al, 2013) and the migration of pollutants (Liu et al, 2019a;Ma et al, 2019;Yang et al, 2019;Yin et al, 2019). According to the Derjaguin, Landau, Verwey, Overbeek (DLVO) theory, interactions between particles in the suspension were dominated by the electrostatic repulsive forces and long-range van der Waals attractive forces (i.e., molecular attraction forces).…”

Section: Introductionmentioning

confidence: 99%

Co‐aggregation of mixture components of montmorillonite, kaolinite and humus

Zhang

Tian

et al. 2021

European J Soil Science

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Soil particle aggregation is closely related to soil quality and pollutant migration in the environment. Soil is a naturally complex system with multi-components, including different organic and inorganic particles. However, current studies with respect to particle aggregation by dynamic light scattering (DLS) have centred on single-component particles. Therefore, the application of DLS to mixture components is an important issue in soil science research. In this study, montmorillonite (Mont), kaolinite (Kaol) and humic acid (HA) particles were mixed in different mass ratios to form two-and three-mixture components, and then the aggregation kinetics of the mixture components in KNO 3 solutions were studied by DLS. The results showed that (a) for any given mixing ratio of two-and three-mixture component particles, there was only one critical coagulation concentration (CCC) value observed for the mixture components; (b) the CCCs of the two-mixture components aggregation were always between the CCC values of each single component in the mixture, and the CCC values of the three-mixture components aggregation were always between those of the two-components aggregation. Based on those experimental results we concluded that, for mixture components aggregation, all the components would participate in the aggregation with equal probability, and the aggregation should be driven by the average DLVO forces of the mixture components. Therefore, for the mixture components of natural soil, the soil particle aggregation would be a co-aggregation process, and the DLS technique would thus be a useful tool to study the real soil aggregation. Meanwhile, HA would decrease soil particle aggregation by increasing the DLVO/XDLVO repulsive forces, rather than promoting soil particle aggregation. Highlights• The aggregation of mixture colloids analysed by DLS is an important issue in soil science research.• There was only one CCC for mixture colloids with different colloidal components.• The aggregation of mixture colloids (soil) is a co-aggregation process.• HA will decrease soil particle aggregation by increasing the DLVO/XDLVO repulsive forces.

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“…Research has also shown that depending on the flow regime (e.g., steady‐state vs. transient) and water content of the porous media, the dominant processes controlling colloid transport, attachment, retention, and remobilization can vary substantially influencing the arrival time, peak concentration, and travel distance of colloids transported in porous media (Carstens, Bachmann, & Neuweiler, 2017; Cheng & Saiers, 2010; Flury & Aramrak, 2017; Keller & Auset, 2007; Knappenberger, Flury, Mattson, & Harsh, 2014; Sen, 2011). It is further understood that solution chemistry including pH (Chotpantarat & Kiatvarangkul, 2018; Ma et al, 2018; Rastghalam, Yan, Shang, & Cheng, 2019), ionic strength (Jahan, Alias, Bin Abu Bakar, & Bin Yusoff, 2019; Magal, Weisbrod, Yechieli, Walker, & Yakirevich, 2011; Rod et al, 2018; Zhuang et al, 2010), and organic matter (Ma et al, 2018; Ma, Guo, Weng, et al, 2018; Yang et al, 2019) as well as the texture and soil grain surface roughness (Kretzschmar & Sticher, 1997; Rasmuson et al, 2019; Redman, Grant, Olson, & Estes, 2001) enhance or impede these processes.…”

Section: Introductionmentioning

confidence: 99%

“…Motivated by the need to advance understanding of contaminant transport through groundwater systems (Grolimund & Borkovec, 2005; Roy & Dzombak, 1997; Saiers & Hornberger, 1999; Turner, Ryan, & Saiers, 2006; Zhuang, Flury, & Jin, 2003), much of the existing research on colloid transport has focused on saturated porous media (Vasiliadou & Chrysikopoulos, 2011; Wang et al, 2012; Yang et al, 2019; Zhuang et al, 2003). Fewer studies have centered on colloid transport in unsaturated porous media, despite the recognition that substantial amounts of colloids are either generated in or passed through the vadose zone (Cheng & Saiers, 2010; Ranville, Chittleborough, & Beckett, 2005; Seaman, Bertsch, & Strom, 1997).…”

Section: Introductionmentioning

confidence: 99%

“…Colloids may be attached or deposited to grain surfaces when the net attractive forces (sum of the interactions of electrical double layers and van der Waals–London forces) fall into either the primary or secondary energy minimum (Gao et al, 2011). However, solution chemistry, grain size, pore flow velocity, and colloid concentration all influence the shape of the DLVO interaction energy curve, the magnitude of the energy barrier, and the depth of the primary and secondary minimum (Carstens et al, 2017; Liu et al, 2018; Rasmuson et al, 2019; Rastghalam et al, 2019; Xu et al, 2016; Yang et al, 2019) and with that the deposition efficiency of colloids from bulk solution. These parameters have also been found to control colloid detachment, the release of deposited colloids from the soil grain, which is dependent on the balance of repulsive forces between colloid and grain surfaces (Chequer, Bedrikovetsky, Carageorgos, Badalyan, & Gitis, 2019; Ma et al, 2016; Ma, Guo, Lei, et al, 2018; Mohanty, Saiers, & Ryan, 2016; Sepehrnia, Fishkis, Huwe, & Bachmann, 2018; VanNess et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Colloid transport through soil and other porous media under transient flow conditions—A review

Wang

Huo

et al. 2020

WIREs Water

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Understanding colloid transport in porous media under transient‐flow conditions is crucial in understanding contaminant transport in soil or the vadose zone where flow conditions vary constantly. In this article, we provide a review of experimental studies, numerical approaches, and new technologies available to determine the transport of colloids in transient flow. Experiments indicate that soil structure and preferential flow are primary factors. In undisturbed soils with preferential flow pathways, macropores serve as main conduits for colloid transport. In homogeneously packed soil, the soil matrix often serves as filter. At the macroscale, transient flow facilitates colloid transport by frequently disturbing the force balance that retains colloids in the soil as indicated by the offset between colloid breakthrough peaks and discharge peaks. At the pore‐scale and under saturated condition, straining, and attachment at solid–water interfaces are the main mechanisms for colloid retention. Variably saturated conditions add more complexity, such as immobile water zones, film straining, attachment to air–water interfaces, and air–water–solid contact lines. Filter ripening, size exclusion, ionic strength, and hydrophobicity are identified as the most influential factors. Our review indicates that microscale and continuum‐scale models for colloid transport under transient‐flow conditions are rare, compared to the numerous steady‐state models. The few transient flow models that do exist are highly parameterized and suffer from a lack of a priori information of required pore‐scale parameters. However, new techniques are becoming available to measure colloid transport in real‐time and in a nondestructive way that might help to better understand transient flow colloid transport. This article is categorized under: Science of Water > Hydrological Processes Science of Water > Water Quality

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Co-transport of U(VI) and gibbsite colloid in saturated granite particle column: Role of pH, U(VI) concentration and humic acid

Cited by 40 publications

References 56 publications

Insight into Hofmeister effects on aggregation of 2:1 and 1:1 type clay minerals

Insight into Hofmeister effects on aggregation of 2:1 and 1:1 type clay minerals

Co‐aggregation of mixture components of montmorillonite, kaolinite and humus

Colloid transport through soil and other porous media under transient flow conditions—A review

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