Specific ion effect of H+ on variably charged soil colloid aggregation

Zhang, Yekun; Tian, Rui; Tang, Jia; Li, Hang

doi:10.1016/s1002-0160(19)60818-0

Cited by 12 publications

(8 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the soluble Na + concentrations decreased, the soil sodium adsorption ratio still increased 5 years after FGD gypsum application due to the decreased soluble Ca 2+ concentrations (Figure 2c). However, after 5 years of reclamation, the exchangeable Ca 2+ concentration had decreased, mainly due to the presence of sufficient water, which was beneficial to the desorption of Na + and increased the exchange of Ca 2+ in soil colloids, leading to an increase in soil pH (Figure 2a) (Marwan & Rowell, 1995; Zhang et al, 2020).…”

Section: Discussionmentioning

confidence: 99%

Soil salinity and sodicity changes after a one‐time application of flue gas desulphurization gypsum to paddy fields

et al. 2021

View full text Add to dashboard Cite

Sodic soil is more likely to deteriorate in paddy fields than in other fields. Flue gas desulfurization (FGD) gypsum can reclaim sodic soils, but how long a one-time application of FGD gypsum provides benefits in paddy fields is poorly understood. In this study, soil salinity, sodicity, and soluble and exchangeable cation concentrations were evaluated over a 7-year period to investigate the reclamation of sodic soil in a paddy field by FGD gypsum. After 7 years, compared with those in the initial soil, the pH, sodium adsorption ratio, and exchangeable sodium percentage of the topsoil (0-20 cm) decreased by at least 2 units, 72.2% and 80.9%, respectively. In the process of FGD gypsum reclamation, substantial changes in topsoil salinity and sodicity

show abstract

Section: Discussionmentioning

confidence: 99%

Soil salinity and sodicity changes after a one‐time application of flue gas desulphurization gypsum to paddy fields

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Both measurements involved continuous and non‐independent variables, so statistical analyses based on data for replicate analyses were unnecessary (such data can be found in other publications [Tian et al, 2014; Zhang et al, 2020]). Parallel DLS experiments were performed for Mt and Ka aggregated in different electrolytes, and the reproducibility of obtained data was stated in the Supplementary Material S3.…”

Section: Methodsmentioning

confidence: 99%

“…Van der Waals attraction mainly depends on the nature of the colloidal particles (Bergström, 1997; Faure et al, 2011; Xu et al, 2015, 2020), while the electrostatic repulsion between colloidal particles is mainly related to the charge properties of the colloidal particles and the nature of the medium solution (He et al, 2007; Huangfu et al, 2013; Ishikawa et al, 2005; Wang et al, 2020; Xu et al, 2015; Zhu et al, 2014). Electrostatic repulsion is also affected by Hofmeister effects: different ions with same valence have significant differences in the ability to screen the surface electric field of colloidal particles, which lead to significant differences in colloid aggregation (Huangfu et al, 2013; Pokhrel et al, 2014; Tian et al, 2014; Vereda et al, 2015; Zhang et al, 2020). For example, the activation energy of negatively charged Mt colloid aggregation in the presence of Li + was respectively 1.2, 5.7, 28 and 126 times that in the presence of Na + , K + and Cs + (Tian et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…In turn Cu 2+ could form a covalent bond with O on Mt surface, which could drastically reduce the electrostatic repulsion between particles; as a result, the ability of Cu 2+ to promote Mt aggregation was much higher than that of Ca 2+ and Mg 2+ (Gao et al, 2019). Meanwhile, the ability of K + to promote the aggregation processes of negatively charged Ag nanoparticles and soil colloids was much stronger than Na + (Pokhrel et al, 2014; Zhang et al, 2020). As for the aggregation of MnO 2 , the critical coagulation concentration (CCC) value of Ca 2+ was significantly lower than that of Mg 2+ and Zn 2+ (Huangfu et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…Therefore, it was revealed that the aggregation regime of gTNPs gradually transited from RLCA to DLCA with decreasing pH values. The TAA rate is used as an important parameter for accurately describing the aggregation kinetics of colloidal nanoparticles Zhang et al, 2020). The plots of the relationship of average aggregation rate ( ṽ(𝑡, 𝑐 0 )) versus time (t) under different pH values are shown in Figure 2c.…”

Section: Monosaccharides Composition (Molar %)mentioning

confidence: 99%

Aggregation kinetics of green tea nanoparticles: Effects of pH, metal ions, and temperature

Guo,

Shen,

Jin

et al. 2023

Journal of Food Science

View full text Add to dashboard Cite

Colloidal nanoparticles in tea infusion are the link connecting micromolecular mechanism and macro‐aggregation process of tea cream formation. In order to elucidate, the kinetics mechanism of green tea nanoparticles (gTNPs) aggregation, zeta‐potentials, total average aggregation (TAA) rates, and critical coagulation concentration (CCC) in the presence of various pH and metal ions were investigated. Additionally, the effect of temperature on gTNPs aggregation was further explored. The results revealed that the TAA rate of gTNPs increased with decreasing pH values, the CCC of gTNPs increased in the order Mg2+ ≈ Ca2+ < Na+ ≈ K+. The reason was that different positive ions changed the surface electric field strength of gTNPs to a different extent. Furthermore, it was indicated that low temperature could promote gTNPs aggregation in indirect way. Low temperature promoted the binding of epigallocatechin gallate (EGCG) and caffeine, and the combination between gTNPs and EGCG–caffeine complexes weakened the stability of gTNPs resulting from reduction in electrostatic repulsion.Practical ApplicationTea is a popular beverage all over the world. This research revealed the mechanism of green tea nanoparticles aggregation and laid a theoretical foundation for the regulation of tea cream formation in tea beverage.

show abstract

Specific ion effect of H+ on variably charged soil colloid aggregation

Cited by 12 publications

References 29 publications

Soil salinity and sodicity changes after a one‐time application of flue gas desulphurization gypsum to paddy fields

Soil salinity and sodicity changes after a one‐time application of flue gas desulphurization gypsum to paddy fields

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

Aggregation kinetics of green tea nanoparticles: Effects of pH, metal ions, and temperature

Contact Info

Product

Resources

About