Insight into the stability and correlated transport of kaolinite colloid: Effect of pH, electrolytes and humic substances

Sun, Ya‐Ping; Pan, Duoqiang; Wei, Xiaoyan; Xian, Dongfan; Wang, Peng; Hou, Junjun; Xu, Zhen; Liu, Chunli; Wu, Wangsuo

doi:10.1016/j.envpol.2020.115189

Cited by 37 publications

(16 citation statements)

References 51 publications

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“…Colloids as pollutant carriers provide the rapid transport pathway and promote the migration of adsorbing contaminants (Simunek et al 2006). Inorganic colloids such as clay and organic colloids such as humus are both responsible for the migration of pollutants (Sun et al 2020). Novikov et al (2006) confirmed that colloids as carriers can promote the long-distance transport of plutonium.…”

Section: The Migration Of Atrazine In Different Porous Mediamentioning

confidence: 91%

Migration characteristics of atrazine in porous media during managed aquifer recharge

Wang

Zhao

et al. 2021

Water Supply

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To study the influences of sand and gravel layer and groundwater velocity of Yufuhe River on atrazine migration, adsorption-desorption and sand column experiments were carried out. Results show that the adsorption capacity of montmorillonite, raw sand and washed sand to atrazine sequentially weakens. In different media, the time for atrazine concentrations to peak in washed sand with motomorillonite (WSM), raw sand and washed sand is 60, 135 and 105 minutes respectively, and the peak concentration accounts for 84, 90 and 95% of the initial concentrations. Under different flow rates, the peak time in washed sand at flow rates of 100, 150 and 200 mL/min is 135, 105 and 75 minutes, and the peak time in WSM is 90, 60 and 45 minutes, respectively. Results from this study indicate that increasing flow velocity and suspended colloids concentrations can promote the migration of atrazine in aquifers, while the presence of clay minerals in sand and gravel layer can reduce atrazine migration. Thus, during Yellow River water recharging, the sand and gravel layer of Yufuhe River is helpful to protect the aquifer, but the colloids-associated migration of atrazine can contaminate groundwater in underlying karst aquifer.

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Section: The Migration Of Atrazine In Different Porous Mediamentioning

confidence: 91%

Migration characteristics of atrazine in porous media during managed aquifer recharge

Wang

Zhao

et al. 2021

Water Supply

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“…A higher release of nano-colloids by LSC sediment (Figure 1) may be explained by the more organic character of <0.2 µm fraction and thus enhances organic colloids' repulsion from mineral surfaces, while the RAl (Corg/Al) and RFe (Corg/Al) calculated for the 0.2-1 µm fraction indicate a more mineral composition, with comparable values for LSC and CHA, respectively (see Section 3.1 in Results). The higher content of larger colloids (Figure 1) released by LSC sediments (calcareous character) can be explained by the enhanced formation of organo-mineral associations in the presence of Ca 2+ and Mg 2+ , which facilitate cation bridging and thus the aggregation of small colloids to large-sized colloids [37]. Since the concentration of large colloids released from LSC sediments was 12 time higher than that from CHA sediments, it is possible that a higher number of particles per unit volume increased particle collision and allowed its aggregation [38].…”

Section: Quality Of the Submicrometric Fraction Recovered From Bottom...mentioning

confidence: 99%

Bioavailability of Colloidal Iron to Heterotrophic Bacteria in Sediments, and Effects on the Mobility of Colloid-Associated Metal(loid)s

et al. 2022

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The submicrometric fraction of surface sediments that accumulate in the bottom of dam reservoirs represent important sources of nutrients and contaminants in freshwater systems. However, assessing their stability in the presence of sediment bacteria as well as their bioavailability in the sediment remains poorly understood. We hypothesized that sediment’s bacteria are able to extract nutrients from sedimentary colloids (<1 µm fraction) and thus contribute to the release of other colloid-associated elements to water. Experiments were performed under laboratory conditions, using the submicrometric fractions of sediments recovered from two dam reservoirs (in calcareous and crystalline granitic contexts) and two heterotrophic bacteria (Gram-negative Pseudomonas sp. and Gram-positive Mycolicibacterium sp.). The results demonstrated that bacteria were able to maintain their metabolic activity (the acidification of the growth medium and the production of organic ligands) in the presence of colloids as the sole source of iron (Fe) and regardless of their chemical composition. This demonstrates that bioavailable Fe, aside from ionic forms, can also occur in colloidal forms. However, the bacteria also catalyzed the release of potentially toxic metallic elements (such as Pb) associated with colloids. These results help improve our understanding of the processes that influence contaminants’ mobility in the ecosystems as well as provide an important insight into current research evaluating the bioavailability of different forms of nutrients.

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“…Sr can also react with clinoptilolite in complex reactions and ion exchange reactions, and the sorption process is affected by intraparticle and surface film diffusion [ 18 ]. In addition, batch experiments show that the sorption behavior of Sr can be influenced by many factors, such as temperature [ 19 ], pH [ 20 ], colloids [ 21 , 22 ], solid amount [ 23 , 24 ], initial concentration [ 25 ], and ionic strength [ 26 ]. From the above research, it can be recognized that the adsorption behavior of Sr in the claystone of geological disposal repositories is complex and affected by many factors.…”

Section: Introductionmentioning

confidence: 99%

A Study of Sr Sorption Behavior in Claystone from a Candidate High-Level Radioactive Waste Geological Disposal Site under the Action of FeOOH Colloids

Wang

Cai

Zuo

et al. 2022

IJERPH

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Colloids have a significant influence on the migration of nuclides in claystone, which is an important geological barrier. The sorption of strontium on claystone in the presence of FeOOH colloids was investigated in samples from the Suhongtu site, a candidate high-level radioactive waste disposal site in China. The effects of colloid amount, solid content, and pH were investigated by batch tests, and the sorption reaction mechanism was analyzed by kinetic modeling and microscopic characterization techniques. The results indicate that the sorption of Sr by claystone increased with the solids content, and the claystone had a stronger Sr sorption capacity under alkaline conditions. The Sr sorption kinetics were best described by the pseudo-first-order and pseudo-second-order models, which revealed that the progress is affected by physical diffusion and chemical sorption. Furthermore, the microscopic characterization results demonstrate that cation exchange reactions and surface complex reactions are the main sorption mechanisms for Sr sorption on claystone. Ca and Mg plasmas in claystone minerals can have cation replacement reactions with Sr, and functional groups such as -OH and [CO3]2− can have complexation reactions with Sr to adsorb Sr on the surface of the claystone. Additionally, the presence of the FeOOH colloid inhibited the sorption effect of claystone slightly. The FeOOH colloid could occupy sorption sites on the claystone surface, which reduces the activity of the functional groups and inhibits the sorption of Sr on claystone.

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Insight into the stability and correlated transport of kaolinite colloid: Effect of pH, electrolytes and humic substances

Cited by 37 publications

References 51 publications

Migration characteristics of atrazine in porous media during managed aquifer recharge

Migration characteristics of atrazine in porous media during managed aquifer recharge

Bioavailability of Colloidal Iron to Heterotrophic Bacteria in Sediments, and Effects on the Mobility of Colloid-Associated Metal(loid)s

A Study of Sr Sorption Behavior in Claystone from a Candidate High-Level Radioactive Waste Geological Disposal Site under the Action of FeOOH Colloids

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