Removal of some radionuclides from contaminated solution using natural clay: bentonite

Seliman, Ayman F.; Lasheen, Y. F.; Youssief, M. A. E.; Abo-Aly, M.M.; Shehata, F. A.

doi:10.1007/s10967-014-3027-z

Cited by 70 publications

(34 citation statements)

References 36 publications

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“…A comparison between the different salts suggests that CsCl has a much stronger effect than NaCl, in agreement with the known strong affinity of Cs for clays [90,91]. LiNO 3 has the weakest effect among the salts shown.…”

Section: Potentiometric Electrolyte Concentrations Of Clay Samplessupporting

confidence: 78%

Charging Behavior of Clays and Clay Minerals in Aqueous Electrolyte Solutions — Experimental Methods for Measuring the Charge and Interpreting the Results

Preočanin¹,

Abdelmonem²,

Montavon³

et al. 2016

Clays, Clay Minerals and Ceramic Materials Based on Clay Minerals

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We discuss the charging behavior of clays and clay minerals in aqueous electrolyte solutions. Clay platelets exhibit different charging mechanisms on the various surfaces they expose to the solution. Thus, the basal planes have a permanent charge that is typically considered to be independent of pH, whereas the edge surfaces exhibit the amphoteric behavior and pH-dependent charge that is typical of oxide minerals. Background electrolyte concentration and composition may affect these two different mechanisms of charging in different ways. To guide and to make use of these unique properties in technical application, it is necessary to understand the effects of the various master variables (i.e. pH and background salt composition and concentration). However, how to disentangle the various contributions to the charge that is macroscopically measurable via conventional approaches (i.e. electrokinetics, potentiometric titrations, etc.) remains a challenge. The problem is depicted by discussing in detail the literature data on kaolinite obtained with crystal face specificity. Some results from similar experiments on related substrates are also discussed. As an illustration of the complexity, we have carried out extensive potentiometric mass and electrolyte titrations on artificial clay samples (Na-, Ca-, and Mgmontmorillonite). A wide variety of salts was used, and it was found that the different electrolytes had different effects on the end point of mass titrations. In the case of a purified sample (i.e. no acid-base impurities), the end point of a mass titration (the plateau of pH achieved for the highest concentrations of solid), in principle, corresponds to the point of zero net proton and hydroxide consumption, at which in ideal systems, such as oxide minerals, the net proton surface charge density is zero. To such concentrated (dense) suspensions of clay particles, aliquots of salts can be added and the resulting pH indicates the specificity of a given salt for a given clay particle system. In the experimental data, some ambiguity remains, which calls for further detailed and comprehensive studies involving the application of all the available techniques to one system. Although, right now, the overall picture appears to be clear from a generic point of view (i.e. concerning the trends), clearly, in a quantitative sense, huge differences occur for nominally identical systems and only such a comprehensive study will allow to proof the current phenomenological picture and allow the next step to be taken to understand the fine details of the complex clay-electrolyte solution interfaces.

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Section: Potentiometric Electrolyte Concentrations Of Clay Samplessupporting

confidence: 78%

Charging Behavior of Clays and Clay Minerals in Aqueous Electrolyte Solutions — Experimental Methods for Measuring the Charge and Interpreting the Results

Preočanin¹,

Abdelmonem²,

Montavon³

et al. 2016

Clays, Clay Minerals and Ceramic Materials Based on Clay Minerals

View full text Add to dashboard Cite

show abstract

“…At present, diverse adsorbents have been developed and investigated for their removal performance 8 – 11 . However, most adsorbents, such as activated carbons 12 , clays, 13 and zeolites 14 , show weak binding affinities toward metal ions. To achieve high efficiency, complex functional groups have been introduced to these porous materials to obtain improved metal uptake capacity 15 – 18 .…”

Section: Introductionmentioning

confidence: 99%

A versatile MOF-based trap for heavy metal ion capture and dispersion

et al. 2018

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Current technologies for removing heavy metal ions are typically metal ion specific. Herein we report the development of a broad-spectrum heavy metal ion trap by incorporation of ethylenediaminetetraacetic acid into a robust metal-organic framework. The capture experiments for a total of 22 heavy metal ions, covering hard, soft, and borderline Lewis metal ions, show that the trap is very effective, with removal efficiencies of >99% for single-component adsorption, multi-component adsorption, or in breakthrough processes. The material can also serve as a host for metal ion loading with arbitrary selections of metal ion amounts/types with a controllable uptake ratio to prepare well-dispersed single or multiple metal catalysts. This is supported by the excellent performance of the prepared Pd2+-loaded composite toward the Suzuki coupling reaction. This work proposes a versatile heavy metal ion trap that may find applications in the fields of separation and catalysis.

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“…The adsorption of four radionuclides [1], Cs-134, Sr-90, Ba-133 and Eu-152 onto the collected Egyptian bentonite and its modified Na + form is investigated by the application of batch equilibrium techniques. At lower concentration, the value of distribution coefficient (Kd) follows the order of Eu-152>Sr-90>Cs-134>Ba>133 for the Bentonite and NaBentonite.…”

Section: Bentonitementioning

confidence: 99%

Application of Modified Clay for Sorption of Radionuclide Elements

Liang¹

2017

J Chromatogr Sep Tech

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The clay materials are distinguished on the basis of their different crystal structures. Due to their specific structure, they are applied in the nuclear industry for the removal of radionuclides from nuclear liquid waste as ion exchange material. This mini review presents some of the recent advances of various kinds of clay materials in this aspect. These inorganic materials continue to gain attention due to their chemical and radiation stability and effectiveness over wide range of conditions.

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Removal of some radionuclides from contaminated solution using natural clay: bentonite

Cited by 70 publications

References 36 publications

Charging Behavior of Clays and Clay Minerals in Aqueous Electrolyte Solutions — Experimental Methods for Measuring the Charge and Interpreting the Results

Charging Behavior of Clays and Clay Minerals in Aqueous Electrolyte Solutions — Experimental Methods for Measuring the Charge and Interpreting the Results

A versatile MOF-based trap for heavy metal ion capture and dispersion

Application of Modified Clay for Sorption of Radionuclide Elements

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