Vitrification of urban soil contamination by hexavalent chromium

Ballesteros, S.; Rincón, J.Ma.; Rincón-Mora, Beatriz; Jordán, Manuel M.

doi:10.1016/j.gexplo.2016.07.011

Cited by 48 publications

(17 citation statements)

References 11 publications

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“…Ex-situ remediation techniques include soil washing [9], solidification [10], and vitrification [11]. In-situ remediation techniques include biological technologies such as phytoremediation [12], microbial remediation [13,14], and genetic engineering remediation [15] as well as encapsulation [16], electrokinetic extraction [17], soil flushing [18], and chemical immobilization.…”

Section: Introductionmentioning

confidence: 99%

Transformation of Pb, Cd, and Zn Minerals Using Phosphates

et al. 2020

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Heavy metal contamination in soils has become one of the most critical environmental issues. The most efficient in-situ remediation technique is chemical immobilization that uses cost-effective soil amendments such as phosphate compounds to decrease Pb, Cd and Zn accessibility in the contaminated soils. The present study examined the effectiveness of KH2PO4 in immobilizing Pb, Cd and Zn in three samples of contaminated soils collected from ZGH “Bolesław” (Mining and Smelting Plant “Bolesław”). Effectiveness was evaluated using the following methods: a toxicity characteristic leaching procedure (TCLP)-based experiment, sequential extraction, X-ray diffraction analyses (XRD), and scanning electron microscopy–energy dispersive spectroscopy (SEM–EDS). The most efficient percentage reduction of total leachable metal concentration assessed by TCLP was observed for lead (50%–80%), and the least reduction was observed for zinc (1%–17%). The most effective immobilization of stable compounds assessed by sequential extraction was noted for lead, while the weakest immobilization was noted for cadmium. New insoluble mineral phases were identified by SEM-EDS analysis. Cd, Zn, and Pb formed new stable mineral substances with phosphates. The predominant crystal forms were dripstones and groups of needles, which were easily formed by dissolved carbon rock surfaces containing zinc ions. The alkaline nature of the soil and a large number of carbonates mainly influenced the formation of new structures.

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Section: Introductionmentioning

confidence: 99%

Transformation of Pb, Cd, and Zn Minerals Using Phosphates

et al. 2020

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“…Nonradioactive waste can be of different origins, for example, generated by the incineration of municipal, medical or biomass waste, the combustion of coal in thermal power plants as well as from slag in iron metallurgy, mud from metal in hydrometallurgy, etc. Glass and glass-ceramics have been considered for the immobilization of nonradioactive waste [1][2][3][4][5] with further application as ceramics and construction materials. Radioactive waste can be produced in different steps of the nuclear fuel cycle or during the application of radioisotopes to other human activities.…”

Section: Introductionmentioning

confidence: 99%

Some Microstructural Properties of Zinc Borosilicate Glass as a Possible Matrix in the Immobilization of Various Wastes

Musić

Marciuš

Krehula

et al. 2019

Croat. chem. acta (Online)

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Zinc borosilicate glass with optimized chemical composition was synthesized and doped with 5 wt % α-Fe2O3. XRD, 57Fe Mössbauer, FT-IR, UV/Vis/NIR and FE SEM were used as the characterization methods. XRD showed the amorphous nature of the samples synthesized. 57Fe Mössbauer spectra confirmed the superposition of Fe3+ in tetrahedral and Fe2+ in octahedral positions. FT-IR spectra showed general features characteristic of different borosilicate glasses. The NIR band at 1116 nm in the UV/Vis/NIR spectrum was assigned to the Fe2+ transition, whereas the Fe3+ transition bands could not be assigned due to the overlapping of several spectral bands of different origin in the UV region centered at 282 nm and the Vis region between 415 to 496 nm. Zinc borosilicate glass as synthesized can be considered as a possible matrix in the immobilization of nonradioactive as well as radioactive wastes.

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“…These problems depend on the concentration and exposure period. 1 Cr(VI) ions accumulate in biological systems and are water soluble at all pHs. Recommendations are given by the World Health Organization, where a limit of 0.05 mg L -1 for Cr(VI) or Cr(III) is accepted as the maximum permissible concentration.…”

Section: Introductionmentioning

confidence: 99%

Donnan Dialysis Assisted by Interpenetrating Polymer Networks for Chromium Ion Transport in Aqueous Media

Tapiero

Rivas

Sánchez

et al. 2018

J. Chil. Chem. Soc.

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Macroporous polypropylene (MPP) membranes incorporating poly[sodium (styrene sulphonate)], P(SSNa), and poly[(ar-vinylbenzyl) trimethylammonium chloride],P(ClVBTA) were modified via "in situ" radical polymerization. Modified and unmodified MPP were characterized using SEM and charge density properties. Donnan dialysis was used to transport chromium ions. The results show that the degree of modification varied between 2.5% and 4.0%, and the water uptake percentage varied between 15% and 20%. Experimental data for chromium ion transport (Cr(III) and Cr(VI)) were fitted to a mathematical model, and a correlation coefficient very close to 1 was obtained. The main parameters of this mathematical fit are k and a. These parameters report the concentration of chromium ions that converge in the Donnan equilibrium (k) and the response rate of the modified membrane (a).

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Vitrification of urban soil contamination by hexavalent chromium

Cited by 48 publications

References 11 publications

Transformation of Pb, Cd, and Zn Minerals Using Phosphates

Transformation of Pb, Cd, and Zn Minerals Using Phosphates

Some Microstructural Properties of Zinc Borosilicate Glass as a Possible Matrix in the Immobilization of Various Wastes

Donnan Dialysis Assisted by Interpenetrating Polymer Networks for Chromium Ion Transport in Aqueous Media

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