Cd(II) adsorption on earth-abundant serpentine in aqueous environment: Role of interfacial ion specificity

Wang, Zhoujie; Tian, Huadong; Liu, Jing; wang, jinling; Lu, Qingye; Xie, Lei

doi:10.1016/j.envpol.2023.121845

Cited by 9 publications

(4 citation statements)

References 52 publications

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“…Although soil inorganic colloids don't have as many rich functional groups as organic colloids, they still have very active properties and affect the transfer and transport of heavy metals in soil profiles and soil-groundwater systems [10]. The co-transport of metal cations and soil clay mineral colloids were extensively investigated.…”

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confidence: 99%

Effect of Bentonite Colloid on Cr(VI) Transport in Heterogeneous Porous Media

Gu,

Ding,

Shi

et al. 2024

Pol. J. Environ. Stud.

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Co-transport of Cr(VI) with bentonite colloids (Bc) at different flow rate, pH, ion strength (IS), and colloid concentration in heterogeneous sand media was investigated. The results showed that obvious penetration of dissolved Cr(VI) in co-transport occurred at about 0.5PV, which was mainly due to the heterogeneity of the sand column. The maximum dimensionless transport fraction ((Ct/C0) max ) of dissolved Cr(VI) was 0.73 in the co-transport (200 mg•L -1 Bc and 2.5 ml min -1 ), much lower than that in the single transport of Cr(VI) (0.98). The increase of pH promoted the transport of Cr(VI) in co-transport with Bc. Elevated flow rate, ion strength, and Bc concentration reduced Cr(VI) transport. Cr(VI) in the effluent in co-transport with Bc was dominated by dissolved Cr(VI), and a small amount of colloidal Cr(VI) (～4.97%) was observed. The recovery rates of total transported Cr(VI) (dissolved +colloidal) in co-transport with Bc were obviously lower than those in single transport. (Ct/C0) max values of dissolved Cr(VI) in the co-transport with Bc were also lower than those with other colloids, e.g. kaolin colloid, montmorillonite colloid, and inorganic soil colloid. Application of bentonite may alleviate the transport risk of Cr(VI) to groundwater.

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Section: Author Copy • Author Copy • Author Copy • Author Copy • Auth...mentioning

confidence: 99%

Effect of Bentonite Colloid on Cr(VI) Transport in Heterogeneous Porous Media

Gu,

Ding,

Shi

et al. 2024

Pol. J. Environ. Stud.

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“…2,3 Although these heavy metal ions (HMs) are present in only trace amounts, they are considered some of the most toxic types of contaminants. 4,5 The mobility and distribution of HMs are intimately related to their ecological hazards, 6 and even a slow transport of HMs through the soil layer could result in pollution in groundwater. 7 Hence, considerable effort has been devoted to understanding the environmental fate and transport behaviors of HMs.…”

Section: Introductionmentioning

confidence: 99%

“…Heavy metals such as cadmium (Cd), lead (Pb), arsenic (As), and chromium (Cr) pose a severe threat to human and ecological health . In aquatic environments, Cd and Pb are commonly present in the form of cationic Cd(II) and Pb(II) while As and Cr mainly exist as oxo-anion species (e.g., arsenate and chromate anions). , Although these heavy metal ions (HMs) are present in only trace amounts, they are considered some of the most toxic types of contaminants. , The mobility and distribution of HMs are intimately related to their ecological hazards, and even a slow transport of HMs through the soil layer could result in pollution in groundwater . Hence, considerable effort has been devoted to understanding the environmental fate and transport behaviors of HMs. , Natural organic matter (NOM) is an important component of organic carbon sinks in terrestrial and aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Insights into the Interaction Mechanism Underlying the Adsorption and Retention of Heavy Metal Ions by Humic Acid

Wang,

Lu,

Liu

et al. 2024

Environ. Sci. Technol.

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The mobility and distribution of heavy metal ions (HMs) in aquatic environments are significantly influenced by humic acid (HA), which is ubiquitous. A quantitative understanding of the interaction mechanism underlying the adsorption and retention of HMs by HA is of vital significance but remains elusive. Herein, the interaction mechanism between HA and different types of HMs (i.e., Cd(II), Pb(II), arsenate, and chromate) was quantitatively investigated at the nanoscale. Based on quartz crystal microbalance with dissipation tests, the adsorption capacities of Pb(II), Cd(II), As(V), and Cr(VI) ionic species on the HA surface were measured as ∼0.40, ∼0.25, ∼0.12, and ∼0.02 nmol cm −2 , respectively. Atomic force microscopy force results showed that the presence of Pb(II)/Cd(II) cations suppressed the electrostatic double-layer repulsion during the approach of two HA surfaces and the adhesion energy during separation was considerably enhanced from ∼2.18 to ∼5.05/∼4.18 mJ m −2 . Such strong adhesion stems from the synergistic metal−HA complexation and cation−π interaction, as evidenced by spectroscopic analysis and theoretical simulation. In contrast, As(V)/Cr(VI) oxo-anions could form only weak hydrogen bonds with HA, resulting in similar adhesion energies for HA−HA (∼2.18 mJ m −2 ) and HA−As(V)/Cr(VI)−HA systems (∼2.26/∼1.96 mJ m −2 ). This work provides nanoscale insights into quantitative HM−HA interactions, improving the understanding of HMs biogeochemical cycling.

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“…Serpentine is a typical magnesium silicate clay mineral with a 1:1 layered structure, one tetrahedral SiO sheet alternating with one octahedral MgOH sheet flanked by an edge plane composed of MgSiO. , Serpentine commonly coexists with sulfide minerals in ore deposits, and froth flotation is a versatile technique for selectively separating value sulfide minerals from gangue serpentine . During the flotation process, large amounts of serpentine fine particles are entrained in the water film confined between bubbles and float to the froth layer containing sulfide minerals, which makes it challenging to realize the selective separation .…”

Section: Introductionmentioning

confidence: 99%

Facet-Dependent Charge Density of Serpentine: Nanoscopic Implications for Aggregation and Entrainment of Fine Particles

Wang,

Xiang,

Wang

et al. 2023

Langmuir

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Cd(II) adsorption on earth-abundant serpentine in aqueous environment: Role of interfacial ion specificity

Cited by 9 publications

References 52 publications

Effect of Bentonite Colloid on Cr(VI) Transport in Heterogeneous Porous Media

Effect of Bentonite Colloid on Cr(VI) Transport in Heterogeneous Porous Media

Nanoscale Insights into the Interaction Mechanism Underlying the Adsorption and Retention of Heavy Metal Ions by Humic Acid

Facet-Dependent Charge Density of Serpentine: Nanoscopic Implications for Aggregation and Entrainment of Fine Particles

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