An experimental study of cotransport of heavy metals with kaolinite colloids

Won, Jongmuk; Wirth, Xenia; Burns, Susan E.

doi:10.1016/j.jhazmat.2019.03.110

Cited by 70 publications

(21 citation statements)

References 42 publications

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“…Increased colloid mobilization, caused by increased flow rate and water content, has also been reported by other investigators [58,71]. It should also be noted that a change in S w may alter colloid retention due changes that occur in the hydrodynamic forces applied onto the colloids [48,65]. Previous studies have also demonstrated that colloid retention in porous media tends to be more pronounced when S w is lowered [72].…”

Section: Effect Of Water Saturationsupporting

confidence: 58%

“…This is attributed to the retention of clay colloids in the porous medium, which in turn retain FA. Several theoretical and experimental investigations have shown that suspended mobile colloids can hinder the mobility of various contaminants in porous and fractured porous media [62][63][64][65]. However, many other factors (e.g., changing pH and ionic strength, presence of organic matter, heterogeneity of natural soil), which are not examined in this study, could also affect the transport of FA in unsaturated porous media.…”

Section: Co-transport Experimentsmentioning

confidence: 82%

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Effect of Clay Colloid Particles on Formaldehyde Transport in Unsaturated Porous Media

Fountouli

Chrysikopoulos

2020

Water

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This study examines the effects of two representative colloid-sized clay particles (kaolinite, KGa-1b and montmorillonite, STx-1b) on the transport of formaldehyde (FA) in unsaturated porous media. The transport of FA was examined with and without the presence of clay particles under various flow rates and various levels of saturation in columns packed with quartz sand, under unsaturated conditions. The experimental results clearly suggested that the presence of clay particles retarded by up to ~23% the transport of FA in unsaturated packed columns. Derjaguin–Landau–Verwey–Overbeek (DLVO) interaction energy calculations demonstrated that permanent retention of clay colloids at air-water interfaces (AWI) and solid-water interfaces (SWI) was negligible, except for the pair (STx-1b)–SWI. The experimental results of this study showed that significant clay colloid retention occurred in the unsaturated column, especially at low flow rates. This deviation from DLVO predictions may be explained by the existence of additional non-DLVO forces (hydrophobic and capillary forces) that could be much stronger than van der Waals and double layer forces. The present study shows the important role of colloids, which may act as carriers of contaminants.

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Section: Effect Of Water Saturationsupporting

confidence: 58%

Section: Co-transport Experimentsmentioning

confidence: 82%

Effect of Clay Colloid Particles on Formaldehyde Transport in Unsaturated Porous Media

Fountouli

Chrysikopoulos

2020

Water

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“…The migration ability of Pb 2þ was greatly enhanced by colloids. The test results here were consistent with those of Won et al (2019). In their study sand columns were used.…”

Section: Transport Of Pb 2þ Facilitated By Colloids Under Preferential Flow Conditionssupporting

confidence: 87%

“…Through tests on sand columns, Möri et al (2003) found that the presence of bentonite colloids could give rise to considerable increases in the migration of some radioactive elements ( 137 Cs, 241 Am, and 238 Pu). Won et al (2019) performed sand column experiment and found that kaolinite facilitated the transport of Pb and Cu under both low and high flow rate, becausethe presence of mobile kaolinite colloids delayed the sorption of heavy metals to the sand. Sen & Khilar (2006) concluded in a review paper that colloid fines can facilitate or retard contaminant transport in porous media, depending on the mobility of the colloids.…”

Section: Graphical Abstract Introductionmentioning

confidence: 99%

Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions

Zhang

Jiang

Sun

2021

Water Science and Technology

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Colloids have a high adsorption capacity and can be mobile under preferential flow, and so may facilitate heavy metal migration. Heavy metal migration with soil colloids in a clayey soil under preferential flow conditions was investigated through experiments. Adsorption tests were carried out to determine the adsorption of Cd2+ and Pb2+ to the clay and colloids. The preferential flow characteristics in the soil column were investigated by dye tracing tests. The mobility of soil colloids in the soil column was studied by breakthrough tests. Leaching tests of cadmium and lead with and without colloids were carried out conditions. The adsorption tests showed that soil colloids adsorbed more cadmium and lead than the silty clay. The dye tracing tests showed that moderate preferential flow in the soil column can be obtained by choosing clod-size distribution and dry density. The co-leaching test showed that the outflow of cadmium and lead was 1.49 and 33.88 times greater with colloids than without, respectively. The heavy metals adsorbed onto clay and the pore concentrations were both lower with colloids than without, indicating more heavy metals migrated downward with colloids. The migration of cadmium and lead was greatly enhanced by colloids under preferential flow conditions.

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“…Kaolinite clay also has been widely accepted as low cost abundant adsorbent for the removal of copper and methyl orange from wastewater due to the surface structure and edges. Recently many studies used natural kaolinite [28], other scientists used purified kaolinite in other wise other researchers used organo kaolinite as adsorbents [29]. However, kaolinite in its different geological origins may have variable chemical compositions and structural deformation.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic and Kinetic Behaviors of Copper (II) and Methyl Orange (MO) Adsorption on Unmodified and Modified Kaolinite Clay

Kourim¹,

Malouki²,

Ziouche³

2021

Clay and Clay Minerals

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In this study, the adsorption of Copper Cu (II) and methyl Orange (MO) from aqueous solution, on Tamanrasset’s unmodified and modified Kaolinite clay which as low cost adsorbents, was studied using batch experiments. The adsorption study includes both equilibrium adsorption isotherms, kinetics and thermodynamics study. For the characterization of the adsorbent several properties are determined such as pH, the Specific Surface Area, the Point of Zero Charge and the Cation Exchange Capacity. Indeed, various parameters were investigated such as contact time, initial metal and dye concentration, mass of solid, pH of the solution and temperature. The adsorption process as batch study was investigated under the previews experimental parameters.

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An experimental study of cotransport of heavy metals with kaolinite colloids

Cited by 70 publications

References 42 publications

Effect of Clay Colloid Particles on Formaldehyde Transport in Unsaturated Porous Media

Effect of Clay Colloid Particles on Formaldehyde Transport in Unsaturated Porous Media

Investigating colloid-associated transport of cadmium and lead in a clayey soil under preferential flow conditions

Thermodynamic and Kinetic Behaviors of Copper (II) and Methyl Orange (MO) Adsorption on Unmodified and Modified Kaolinite Clay

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