Sorption of heavy metal cations on rhyolitic and andesitic bentonites from Central Slovakia

Andrejkovičová, S.; Pentrák, Martin; Jankovič, Ľuboš; Komadel, Peter

doi:10.2478/v10096-010-0008-1

Cited by 18 publications

(6 citation statements)

References 56 publications

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“…Sample L was a bentonite from the Lieskovec deposit, which is situated in the western part of the Zvolenská Kotlina Basin, near Lieskovec Ridge. The chemical and mineralogical characteristics of both bentonites were described by Kraus et al (1994), Komadel et al (2008), Galamboš et al (2009) and Andrejkovičová et al (2010). The mineral and chemical composition of the starting bentonites is summarized in Tables 1 and 2. Pyrite concentrate was used in this study as the source of pyrite; it was the product of technological processing of sulphide ores from the Smolník deposit.…”

Section: Starting Materialsmentioning

confidence: 99%

Reaction of bentonites with pyrite concentrate after wetting and drying cycles at 80°C: relevance to radioactive waste (Radwaste) storage

Osacký¹,

Šucha²,

Miglierini³

et al. 2012

Clay miner.

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The mineral stability of two bentonites was studied in the presence of pyrite concentrate to simulate the possible reactions between the bentonite barrier used in a high-level nuclear waste (HLW) repository and host rock containing up to 5 wt.% of admixed pyrite. Smectite was the only bentonite mineral affected by pyrite treatment under the experimental conditions used. Bentonites reacted differently with pyrite due to the different nature of the smectites. The distinct crystal chemistry of the smectites controlled by the composition of the parent rocks influenced the smectite surface properties (cation exchange capacity and layer charge distribution) which resulted in a different response of the bentonites to pyrite treatment. A partial transformation of the original smectites into H-smectites represented the initial stage of smectite destabilization on acid attack. Rising non-equivalent isomorphous substitution in the octahedral sheets of the smectites enhanced smectite reactivity and thus the reaction between bentonite and pyrite, causing lower stability of the bentonite containing high-charge smectite.

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Section: Starting Materialsmentioning

confidence: 99%

Reaction of bentonites with pyrite concentrate after wetting and drying cycles at 80°C: relevance to radioactive waste (Radwaste) storage

Osacký¹,

Šucha²,

Miglierini³

et al. 2012

Clay miner.

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“…Overall, the specific layered structure of smectites is responsible for their unique properties, such as high CEC and TSSA, swelling capacity, low hydraulic conductivity and high adsorption capacity. Due to these properties, smectites have been studied for many potential environmental applications, for example, as sealing material in landfill liners (Andrejkovičová et al 2008), backfill material for construction of high-level nuclear waste (HLW) repositories (Pacovský et al 2007;Stríček et al 2009;Osacký et al 2013), wastewater treatment (Viraraghavan & Kapoor 1994), adsorbent for heavy metals (Sheta et al 2003;Rao et al 2006;Andrejkovičová et al 2010;Galindo et al 2013) and organic compounds (Tiller et al 1984). The bulk of the world's bentonite production in 2018 (~28 million t) is used as pet waste absorbents, drilling mud, foundry sand and ore pelletizing (U.S. Geological Survey 2019).…”

Section: Introductionmentioning

confidence: 99%

Mineralogical and physico–chemical properties of bentonites from the Jastrabá Formation (Kremnické vrchy Mts., Western Carpathians)

Osacký

Binčík

Paľo

et al. 2019

Geologica Carpathica

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In the past years an increasing demand for bentonites resulted in the opening of new bentonite deposits in the Jastrabá Formation. The shortage of information, in particular analytical data, on the bentonites from the newly opened Jastrabá Fm. deposits was the motivation for the current study. Smectite is the predominant mineral in all bulk bentonites from the new deposits. Its amount varied between 43 and 90 wt. %. The bulk bentonites also contain variable amounts (10–57 wt. %) of mineral admixtures such as feldspars, mica, opal-CT, kaolinite, quartz and sometimes goethite. The smectite mineral comprising the studied bentonites was montmorillonite. The octahedral Al in the structure of montmorillonite was partially substituted by Mg, and to a lesser extent by Fe. The interlayer space of montmorillonite is occupied predominantly by divalent exchangeable cations (Ca2+ and Mg2+). The dehydroxylation temperature of smectites (>600 °C) determined on the DTG curves indicates the presence of the cis-vacant variety of montmorillonites. The mean crystallite thicknesses of smectites (TMEAN) calculated by BWA analyses ranges from 7.2 to 11.5 nm. The shape of the crystallite thickness distributions (CTDs) for smectites is lognormal in all cases. Cation exchange capacity (CEC) and total specific surface area (TSSA) increases with increasing amount of smectite. The CEC of 101 meq/100g and TSSA of 616 m2/g correspond to bulk bentonite from the Stará Kremnička III deposit containing 89 wt. % of smectite.

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“…There are few significant deposits of bentonite in the East part of Slovakia (Kuzmice, Fintice, Lastovce) as well as in Central Slovakia (Stará Kremnička -Jelšový potok and Lieskovec). These bentonites are used for industrial purposes, and their geological, geotechnical and sorption properties are still studied by Slovak researchers for their wider utilisation [6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of As(V) adsorption onto different adsorbents

Danková¹,

Bekényiová²,

Lukáčová-Bujňáková³

et al. 2019

chemija

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The As(V) adsorption onto natural bentonite (B), Fe enriched bentonite (FB) and synthetic magnetic particles (MP) from the aqueous solutions was investigated by batch as well as column tests. The natural materials did not show such good adsorption properties towards As(V) in the batch experiments as MP, whose Qmax was calculated to 23 mg/g. However, in column experiments the adsorption effect of natural materials was comparable with MP. The model solution with the concentration 30 mg As(V)/L was percolated through the columns filled with the B and FB sample. After two cycles the As(V) concentration was lower than 2 mg/L. The second series of columns were filled with FB/MP/QS and B/MP/QS. Two cycles with the solution concentration of 50 and 100 mg As(V)/L were performed. After the second cycle 74 and 100% of As(V) were removed by FB/MP/QS and B/ MP/QS, respectively. In the third series two most effective columns were selected for the second percolation of 100 mg As(V)/L solution. While the adsorption effect of the QS/MP column decreased at 36%, for the QS/B/MP column it was about 24%. The first experimental study showed that natural materials should be used effectively as column fillers to fix finer magnetic particles. On the other hand, their selectivity towards Cu(II) and Zn(II) ions could be beneficial for regeneration of media used in the process of soil bioremediation.

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Sorption of heavy metal cations on rhyolitic and andesitic bentonites from Central Slovakia

Abstract: Abstract:The main purpose of this work was to determine adsorption characteristics of heavy metal cations on two Slovak bentonites.

Cited by 18 publications

References 56 publications

Reaction of bentonites with pyrite concentrate after wetting and drying cycles at 80°C: relevance to radioactive waste (Radwaste) storage

Reaction of bentonites with pyrite concentrate after wetting and drying cycles at 80°C: relevance to radioactive waste (Radwaste) storage

Mineralogical and physico–chemical properties of bentonites from the Jastrabá Formation (Kremnické vrchy Mts., Western Carpathians)

Experimental study of As(V) adsorption onto different adsorbents

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