Recent developments in nanostructured inorganic materials for sorption of cesium and strontium: Synthesis and shaping, sorption capacity, mechanisms, and selectivity—A review

Alby, Delhia; Charnay, Clarence; Héran, Marc; Prelot, Bénédicte; Zając, Jerzy

doi:10.1016/j.jhazmat.2017.10.047

Cited by 210 publications

(70 citation statements)

References 158 publications

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“…This hypothesis was first proposed by the authors of work [28] and later confirmed in many studies on the sorption of alkali and alkaline earth cations by phosphates, heteropoly compounds, titanosilicates [7,29,30]. It should be noted that the size of the Cs(I) and Sr(II) ions is 0.2-0.4 nm [31], which corresponds to micropores size. This feature of modified SnO 2 , namely its indifference to the Cs(I) and Sr(II) ions in combination with the significant sorption capacity of the U(VI) ions, is rather unique, since the most sorbents are capable of one or another way adsorbing ions of Cs(I), Sr(II), and U(VI).…”

mentioning

confidence: 64%

Study of the physical-chemical and sorption properties of SnO2 prepared by mechanochemical and microwave routes

Samsonenko¹,

Zakutevskyy²,

Khalameida³

et al. 2018

Him. Fiz. Tehnol. Poverhni

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There are many methods for synthesis of tin dioxide SnO 2 , namely sol-gel, precipitation. However, these methods do not allow to regulate the physical-chemical properties in wide limits in the synthesis stage. The most commonly obtained samples are predominantly microporous as a rule. On the other hand, the meso-macroporous structure is required for the effective use of tin dioxide in sorption processes. The mechanochemical and microwave treatments can be used for eliminating mentioned above disadvantages. Therefore, the purpose of this work was to study the influence of the mechanochemical and microwave treatments on the physical-chemical and sorption properties of SnO 2 prepared by heterogeneous precipitation. SnO 2 gels and xerogels have been obtained by heterogeneous precipitation. The mechanochemical treatment was carried out in air and water at 300 rpm for 0.5 h in the form of dried xerogel as well as wet gel using a planetary ball mill Pulverisette-7. Initial wet gel was subjected to microwave treatment for 1 h using a high-pressure reactor «NANO 2000». We used XRD and DTA-TG analysis, FTIR spectroscopy, adsorption-desorption of nitrogen for characterization of initial and modified samples. The initial sample corresponds to the composition tin oxohydroxide with gross formula Sn 3 O 4 (OH) 4. For the modified samples a partial removal of the structural OH groups occurs. The initial sample is characterized by high values of specific surface area and high content of micropores. The specific surface area, total volume of pores, mesoporous size are increased as a result of the mechanochemical and microwave treatments. Formation of the secondary porosity that presented by meso-and macropores is peculiarity of xerogel milling in water. The cation exchange capacity under the most optimal conditions for the sorption of U(VI) ions (pH = 5-6, no background, cationic forms of uranium) for the initial sample was 0.82 mEq/g UO 2 2+. The mechanochemical and microwave treatments result in drastic increase in sorption capacity of tin oxohydroxide in relation to U(VI) ions. The greatest effect was observed for sample milled in the form of wet gel, the sorption capacity А of which increases almost in three times while distribution coefficient K d increases almost 70 times. In case of sorption on the background of 0.1 M NaHCO 3 (pH 8, model of block water of the Chernobyl Nuclear Power Plant), the sorption capacity of sample after mechanochemical treatment of gel increases by 43 % compared to initial sample from 0.31 to 0.43 mEq/g UO 2 2+. Thus, modified samples can remove both cationic and anionic forms of U(VI) ions in the solution. At the same time, for sorption of Cs(I) and Sr(II) ions, it has been found, that in both cases the mechanochemical and microwave treatments negatively affect to their removal in comparison with initial sample.

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confidence: 64%

Study of the physical-chemical and sorption properties of SnO2 prepared by mechanochemical and microwave routes

Samsonenko¹,

Zakutevskyy²,

Khalameida³

et al. 2018

Him. Fiz. Tehnol. Poverhni

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“…During the adsorption process, the different parameters affected the characteristics of removal Cs(I) ions from aqueous solutions in terms of pH, time, concentration and metal ion diffusion were studied. In a typical Cs(I) ions-adsorption experiments, the MMT-IEX (30 mg) were immersed in a 20 mL of Cs(I) ions solution (150 mg L À1 ) and adjusted to the desired pH (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11). The solutions contain MMT-IEX were shaken at 300 rpm for 90 min.…”

Section: Batch Studies For Cs(i) Ions Adsorption On Mmt-iexmentioning

confidence: 99%

“…Among them, 134 Cs, 135 Cs, and 137 Cs are of particular danger due to their high environmental mobility. [1][2][3][4][5] The transport of radionuclides through aquatic systems is partially dependent on the physical and chemical properties of the nuclide and the water body. [1][2][3] From a chemical point of view, Cs is a chemical analog to potassium, being a monovalent cation it would also tend to sorb to most negatively charged surfaces.…”

Section: Introductionmentioning

confidence: 99%

Decontamination of radioactive cesium ions using ordered mesoporous monetite

et al. 2018

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“…Sorption techniques have the ability to remove these contaminants via adsorption onto sorbents. However, the type of sorbent to be used for remediation depends on the sorption capacity, sorption pH and distribution coefficient of the contaminant [30]. The review on the sorption of Ni(II) adsorbents indicates that bisorbents are the most effective for removal of the ion from aqueous solution [31].…”

Section: Introductionmentioning

confidence: 99%