Retention of arsenic, chromium and boron on an outcropping clay-rich rock formation (the Tégulines Clay, eastern France)

Debure, Mathieu; Tournassat, Christophe; Lerouge, Cathérine; Madé, Benoı̂t; Robinet, Jean-Charles; Fernández, Ana María; Grangeon, Sylvain

doi:10.1016/j.scitotenv.2018.06.037

Cited by 28 publications

(34 citation statements)

References 52 publications

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“…44,45 Clays can retain as much as 110 ± 22 µg of B per gram of rock. 43 Here, the modelling results are consistent with those of the field experiment. Only by dismantling the experiment, however, can we resolve the discrepancy between the modelling and solution analyses by measuring the thickness of the altered layer and comparing it with the thickness calculated based on the concentration of B leached into the solution.…”

Section: Glass Corrosion In Geological Media: Mechanisms Involvedsupporting

confidence: 86%

“…Calcite precipitation does consume B 41,42 and B sorbs onto clays in a similar context. [43][44][45][46] However, uptake would require a significant amount of B in the calcite as only a negligible amount of a mineral is formed (of the order of micromoles). In clay, sorption is a twostep process of adsorption followed by incorporation in which B may replace Si and Al at tetrahedral sites.…”

Section: Glass Corrosion In Geological Media: Mechanisms Involvedmentioning

confidence: 99%

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In situ nuclear-glass corrosion under geological repository conditions

et al. 2019

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Silicate glasses are durable materials but laboratory experiments reveal that elements that derive from their environment may induce high corrosion rates and reduce their capacity to confine high-level radioactive waste. This study investigates nuclear-glass corrosion in geological media using an in situ diffusion experiment and multi-component diffusion modelling. The model highlights that the pH imposed by the Callovo-Oxfordian (COx) claystone host rock supports secondary-phase precipitation and increases glass corrosion compared with pure water. Elements from the COx rock (mainly Mg and Fe) form secondary phases with Si provided by the glass, which delay the establishment of a passivating interface. The presence of elements (Mg and Fe) that sustain glass alteration does not prevent a significant decrease in the glass-alteration rate, mainly due to the limited species transport that drives system reactivity. These improvements in the understanding of glass corrosion in its environment provide further insights for predictive modelling over larger timescales and space.

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Section: Glass Corrosion In Geological Media: Mechanisms Involvedsupporting

confidence: 86%

Section: Glass Corrosion In Geological Media: Mechanisms Involvedmentioning

confidence: 99%

In situ nuclear-glass corrosion under geological repository conditions

et al. 2019

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“…Arsenic exists primarily in two oxidation forms: arsenate (As(V)) and arsenite (As(III)). As(III) is more toxic than As(V) and pose a greater threat to society due to its higher solubility in aqueous solutions [2]. Contamination of water with arsenic compounds is one of the most significant scientific challenges.…”

Section: Introductionmentioning

confidence: 99%

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

et al. 2019

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Among the various technologies tested for removing the anionic species resulting from arsenic contamination, sorption methods have received unflagging interest. Being potential sorbent materials, clay minerals modified by cationic surfactants are often examined for this purpose. Among the clay minerals tested, information regarding sorption properties of expanded vermiculite modified with surfactants is scarce. Therefore, the present study aims to prepare organo-vermiculites modified with hexadecyltrimethylammonium (HDTMA) and benzyldimethylhexadecylammonium (HDBA) at surfactant concentrations of 0.5, 1.0, and 2.0 cation exchange capacity. Modified sorbents were identified and characterized using the analytical methods that can determine phase composition and textural properties of the samples. The sorption of As(III) and As(V) as a function of initial pH value, initial concentration of As(III, V), and initial dosage of sorbent was investigated. The results show that HDTMA and HDBA affect the properties of raw vermiculite. For instance, increase in the concentration of surfactants is often accompanied by a change in interlayer space or textural properties of vermiculite. It was observed that tested organo-minerals adsorbed As(V) to a greater extent compared to As(III). Various analytical studies were carried out and the results revealed the successful synthesis of organo-vermiculite. Moreover, the study also showed that the structure of organo-vermiculite has a significant impact on the uptake of As(III) and As(V) anions.In the last decades, various technologies for removing As from contaminated water have been investigated, such as oxidation, coagulation, ion exchange, precipitation, membrane filtration, biological treatment, and sorption [9][10][11]. However, most of these methods have drawbacks, including high costs, deficient removal, generation of waste products, or high reagent and energy requirement. Among the methods mentioned earlier, adsorption seems to be the most effective method [1,12]. For removal by adsorption technique, activated carbon, metal-organic frameworks, zeolites, bog iron ores, water treatment residuals, and activated alumina have been proven to be promising adsorbents for arsenic removal [13][14][15][16][17].Clay minerals are low-cost and nontoxic sorbents. Raw clays are able to sorb cations owing to their negatively charged surface; however, they display low sorption efficiency for negatively charged contaminants such as arsenic [18]. Nevertheless, clays can be chemically modified by organic surfactants, which change the charge on the clay surface from negative to positive [19]. The organo-clays are hydrophobic materials that can effectively sorb anions and organic compounds. Modified kaolinite, montmorillonite, and illite are the most popular clay minerals that are used as sorbents [20][21][22]. However, only a few studies have focused on using organo-vermiculites to sorb anions [23,24].Vermiculite is a 2:1 phyllosilicate mineral having a sandwiched structure with two tetrahedral shee...

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“…Various methods of metal ions treatments such as precipitation, ion exchange, a process linked to the membrane, solvent extraction and adsorption [6][7][8][9][10][11][12] , as well as adsorption with natural adsorbent among others 11 ; are presently in use for the treatment of metal ions.…”

Section: Introductionmentioning

confidence: 99%

Kinetic and Thermodynamic Study of Adsorption of Copper (II) Ion on Moroccan Clay

Essebaai

Ismi²,

Lebkiri³

et al. 2019

Mediterr.J.Chem.,

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Highly efficient low-cost adsorbent was applied for copper (II) ions uptake from aqueous solution. Characteristics of natural adsorbent were established using scanning X-ray diffraction (XRD), X-ray fluorescence, electron microscope (SEM) and Fourier Transform Infra-Red (FTIR). Various physicochemical parameters such as contact time, initial copper(II) ions concentration, adsorbent dosage, pH of copper (II) ions solution and temperature were investigated. The result showed that the adsorption of copper (II) ions by natural clay was favorable at pH=5,5. The adsorption was found to increase with increase in initial copper (II) ions concentration, and contact time. Equilibrium adsorption data were fitted using three isotherms and kinetic data tested with four kinetic models. Freundlich isotherm best described the adsorption of copper (II) ions onto utilised clay, the maximum monolayer adsorption capacity (qmax) was 8 mg/g. Pseudo-second-order model best described the kinetics of the adsorption process. Thermodynamic parameters such as Gibbs free energy, enthalpy and entropy were determined. It was found that copper (II) ions adsorption was spontaneous (ΔG°<0) and endothermic (ΔH°>0).

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Retention of arsenic, chromium and boron on an outcropping clay-rich rock formation (the Tégulines Clay, eastern France)

Cited by 28 publications

References 52 publications

In situ nuclear-glass corrosion under geological repository conditions

In situ nuclear-glass corrosion under geological repository conditions

Organo-Modified Vermiculite: Preparation, Characterization, and Sorption of Arsenic Compounds

Kinetic and Thermodynamic Study of Adsorption of Copper (II) Ion on Moroccan Clay

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