Pb2+ ions mobility perturbation by iron particles during electrokinetic remediation of contaminated soil

Zulfiqar, Waqas; Asad, Iqbal. Muhammad; Butt, Mehwish Khalid

doi:10.1016/j.chemosphere.2016.11.083

Cited by 33 publications

(11 citation statements)

References 15 publications

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“…Hence, Fe 2+ ions are produced, and these cations enter into the soil specimen due to electromigration and electroosmosis. Meanwhile, it can reduce current density and prevent the EOF of water through soil specimens in the form of Fe(OH)2 [27].…”

Section: Electroosmosismentioning

confidence: 99%

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Optimization of electroosmotic flow to enhance the removal of contaminants from low‑permeable soils

et al. 2023

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Electrokinetic is the effective method for the extraction of contamination from low permeable soil. This work examines the influence of calcium ions on the electroosmosis, and the effects of electric potential, current, and pH variation on the removal of Pb 2+ , Na + , and Clˉ ions from artificially contaminated soil during vertical electrokinetic experiments. The DC electric field of 1V/cm was applied across the soil specimen via steel mesh electrodes for 24, 48 and 72 hours of experiment. The outcomes show that the formation of acidic and alkaline environments in soil specimens affects the transport of ionic charge species by reducing the effect of electroosmosis.To enhance the electroosmotic flow, the anode reservoir filled with and without calcium chloride solution was examined. The enhancement of electroosmosis using calcium ions as an electrolyte increased the extraction efficiency of Pb 2+ and Na + ions instead of the Clˉ ions due to the high electroosmotic flow from anode to cathode. For relatively low electroosmotic flow, the removal rate of Clˉ ions was higher than the Pb 2+ and Na + ions. The results demonstrated that the extraction efficiency was increased with an increase in the treatment time. To avoid the dryness of the soil surface, wet sponges were inserted at the anode side, which connected with the electrolyte.

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Section: Electroosmosismentioning

confidence: 99%

“…( 3) and Eq. ( 4), the Pb 2+ and Fe 2+ ions precipitate in the soil specimen with the alkaline fronts in the form of compounds such as Pb(OH)2 and Fe(OH)2 [27]. These compounds reduce the soil pore space and mobility of Pb 2+ ions during VEK experiments.…”

Section: Distribution Of Ions and Electrical Conductivity In Soil Seg...mentioning

confidence: 99%

Optimization of electroosmotic flow to enhance the removal of contaminants from low‑permeable soils

et al. 2023

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“…Results indicate that a slight increase in the BET surface area of soil specimen along with a tiny decrease in the average particle size was recorded as the introduction of Lead Nitrate. This phenomenon suggests that the Lead Nitrate is corrosive so that part of natural organic matters adsorbed on the soil particles [38], or the bonded soil particles may be decomposed, and lead to a decreased in the average soil particle size. For the NZVI treated soil specimens, a gradual decrease in the average particle size was found as the increase of added nanoscale NZVI except for the 10% NZVI treated soil specimen.…”

Section: Xpsmentioning

confidence: 99%

Untitled

2018

Int J Earth Sci Geophys

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Nanoscale Zero Valent Iron (NZVI) is the most widely used engineering nanomaterials in the remediation of contaminated site. This study investigated the effect of NZVI treatment on the physicochemical properties of Lead (Pb)-contaminated soil to improve the understanding of the soil improvement. The changes of soil physicochemical properties were investigated using the concentration range of 0.2%, 1%, 5%, and 10% NZVI g/g dry soil. Results showed that the introduction of NZVI to the Pb-contaminated soil resulted in substantial changes in the surface physicochemical properties. The ferric and ferrous ions, and the lead ions were released at the same time from the corrosion of NZVI precipitation, and from the surface of soil particles, respectively, amongst which, part of exchangeable lead ions were reduced to Pb(I) and/or Pb 0. A general change in the soil's electrical conductivity, BET surface area, soil buffering capacity, and soil's particle size was confirmed. A conclusion was drawn that the mass transfer of NZVI and its induced precipitation of Fe/Pb ions made a great contribution to the changes of soil physicochemical properties. This study could make for the application of nanomaterials in remediation of contaminated sites, especially for the brownfield remediation and backfill usage after the contaminated soil was remediated.

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“…One such technique is electrokinetic remediation: the use of an applied electric field to induce the migration of charged materials in a saturated porous medium [7]. The technique has been utilised for the treatment of land, soils, gravels contaminated with halogens [8], hydrocarbons [9,10], heavy metals [11][12][13][14][15], pesticides [16], and radionuclides [17][18][19][20], with ongoing studies to scale-up the technique [21]. However, research into its potential as a concrete decontamination technique has been limited.…”

Section: Introductionmentioning

confidence: 99%

Remediation of 137Cs contaminated concrete using electrokinetic phenomena and ionic salt washes in nuclear energy contexts

Parker

Joyce

Boxall

2017

Journal of Hazardous Materials

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This work describes the first known the use of electrokinetic treatments and ionic salt washes to remediate concrete contaminated with Cs. A series of experiments were performed on concrete samples, contaminated with K and Cs, using a bespoke migration cell and an applied electric field (60V potential gradient and current limit of 35mA). Additionally, two samples were treated with an ionic salt wash (≤400molm of KCl) alongside the electrokinetic treatment. The results show that the combined treatment produces removal efficiencies three times higher (>60%) than the electrokinetic treatment alone and that the decontamination efficiency appears to be proportional to the initial degree of contamination. Furthermore, the decontamination efficiencies are equivalent to previous electrokinetic studies that utilised hazardous chemical enhancement agents demonstrating the potential of the technique for use on nuclear licensed site. The results highlight the relationship between the initial contamination concentration within the concrete and achievable removal efficiency of electrokinetic treatment and other treatments. This information would be useful when selecting the most appropriate decontamination techniques for particular contamination scenarios.

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Pb2+ ions mobility perturbation by iron particles during electrokinetic remediation of contaminated soil

Cited by 33 publications

References 15 publications

Optimization of electroosmotic flow to enhance the removal of contaminants from low‑permeable soils

Optimization of electroosmotic flow to enhance the removal of contaminants from low‑permeable soils

Untitled

Remediation of 137Cs contaminated concrete using electrokinetic phenomena and ionic salt washes in nuclear energy contexts

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