Removal of cesium from the porous surface via the electrokinetic method in the presence of a chelating agent

Popov, Konstantin; Glaskova, I. V.; Myagkov, S.; Petrov, A. A.

doi:10.1134/s1061933x06060111

Cited by 10 publications

(19 citation statements)

References 17 publications

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“…Trials with different types of treatments can be found in literature [3][4][5][6][7][8][9][10][11][12][13]. Among them, only a few studies on electrokinetic treatments to decontaminate concrete [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Assessment of electrophoresis and electroosmosis in construction materials: effect of enhancing electrolytes and heavy metals contamination

2010

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Electrokinetic effects are those that take place by application of an electric field to porous materials, with the zeta potential as the key parameter. Specifically, in the case of contaminated construction materials, the generation of an electroosmotic flux, with the corresponding dragging due to water transport, is a crucial mechanism to succeed in the treatment of decontamination. Therefore, it is of great interest trying to optimize the treatment by the addition of specific electrolytes enhancing the electrokinetic phenomena. Most of the data of zeta potential found in literature for construction materials are based in micro-electrophoresis measurements, which are quite far of the real conditions of application of the remediation treatments. In this paper, electrophoretic and electroosmotic experiments, with monolithic and powdered material respectively, have been carried out for mortar, brick and granite clean and contaminated with Cs, Sr, Co, Cd, Cu and Pb. The electrolytes tested have been distilled water (DW), Na 2 -EDTA, oxalic acid, acetic acid and citric acid. The zeta potential values have been determined through the two different techniques and the results compared and critically analysed.

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Section: Introductionmentioning

confidence: 99%

Assessment of electrophoresis and electroosmosis in construction materials: effect of enhancing electrolytes and heavy metals contamination

2010

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“…An electrokinetic technology has been used to treat concrete contaminated with radionuclides and to study its effect on chloride transport through cement-based materials [2]. It was shown that the combination of an electrokinetic treatment and the action of Trilon B solution made it possible to considerably enhance the efficiency of the removal of cesium from the surface of a hardened cement mortal [3]. Also, the electrokinetic decontamination experiments of concrete have determined that the loading of cesium and strontium on concrete may be decreased by using electrolyte solutions containing competing cations, while solubilization of uranium and cobalt require lixiviants containing complexing agents [4].…”

Section: Introductionmentioning

confidence: 99%

Decontamination of radioactive concrete using electrokinetic technology

2010

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The experimental results of the electrokinetic decontamination with 0.01 M of nitric acid were that the cesium ions were removed by up to 52% from the concrete after 15 days, also the cobalt ions were only removed by up to 0.7%. The concrete should be washed with H 2 SO 4 as a pretreatment before electrokintic decontamination to lower its pH below 4.0. The removal efficiencies of 60 Co and 137 Cs by nitric acid were increased by 3.1 and 2.5% more than those by acetic acid. The larger the particle size of the concrete, the more the removal efficiencies of 60 Co and 137 Cs were increased. Also, the removal efficiencies of 60 Co and 137 Cs by the application of an electric current of 20 mA/cm 2 were increased by 1.6 and 3.9% more than those by the application of 10 mA/cm 2 . The removal efficiencies of 60 Co and 137 Cs from the radioactive concrete of 1,940 Bq/kg were 99.8 and 92.3% by electrokinetic decontamination after pretreatment by the application of an electric current of 20 mA/cm 2 for 25 days.

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“…In the past years, decontamination of construction materials has become a subject of great interest, mainly related to radioactive elements, finding in the literature trials with different types of treatments [1][2][3][4][5][6][7][8][9][10][11]. Among the different treatments, only few studies on electrokinetic treatments to decontaminate concrete have been found [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Among the different treatments, only few studies on electrokinetic treatments to decontaminate concrete have been found [6][7][8][9][10][11][12]. The electrokinetic treatment for remediation of construction materials is based on the direct application of an electrical field to the contaminated porous materials, being the final efficiency in function of the solubility of the contaminants and their transport through the electrodes that depends on several factors related to the properties of the material, the contaminants and the specific experimental parameters.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic decontamination of heavy metals in construction materials: contribution of the different parameters to the global efficiency

Castellote

Botija²

2011

J Appl Electrochem

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To discriminate between the relative weights of each factor involved in the global process of an electrokinetic treatment for remediation, mortar and brick contaminated with Cs, Sr, Co, Cd and Cu were submitted to electrokinetic treatments with different enhancing electrolytes (distilled water, Na 2 -EDTA, oxalic acid and citric acid), and the efficiency was analysed in function of the parameters involved in the process. The data obtained in this research, a matrix including 40 cases, have been correlated for the decontamination percentage in function of the key variables of the treatment, and the best correlation found, able to explain a variance of the 78.5% of the data, was a non linear exponential grow regression. An order in the weight of the contributions has been established that, from bigger to smaller contribution, is: constants of chelation equilibriums [ precipitation as hydroxide constants [ zeta potential [ conductivity of the catholyte [ pH catholyte [ diffusion coefficient [ pH of the material.

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Removal of cesium from the porous surface via the electrokinetic method in the presence of a chelating agent

Cited by 10 publications

References 17 publications

Assessment of electrophoresis and electroosmosis in construction materials: effect of enhancing electrolytes and heavy metals contamination

Assessment of electrophoresis and electroosmosis in construction materials: effect of enhancing electrolytes and heavy metals contamination

Decontamination of radioactive concrete using electrokinetic technology

Electrokinetic decontamination of heavy metals in construction materials: contribution of the different parameters to the global efficiency

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