Ion exchange and structural properties of a new cyanoferrate mesoporous silica material for Cs removal from natural saline waters

Michel, Caroline; Barré, Yves; Windt, Laurent de; Dieuleveult, Caroline de; Brackx, Emmanuelle; Grandjean, Agnès

doi:10.1016/j.jece.2016.12.033

Cited by 35 publications

(28 citation statements)

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“…The synthesis and Cs adsorption properties of S202 in aqueous solutions have been described previously [11]. This material consists of a mesoporous silica matrix with pores around 8 nm in diameter, and grain size of 250-500 µm containing K 2 Cu(Fe(CN) 6 ) nanoparticles that selectively extract Cs.…”

Section: Characteristics Of the Adsorbent And Solution Usedmentioning

confidence: 99%

“…The grains have an irregular, roughly octahedral, shape. As reported previously [11], the material's specific surface area (S BET = 280 m 2 •g −1 ) was obtained by measuring nitrogen adsorption-desorption isotherms and applying the BET model [16]. The mean pore diameter (d p = 7.9 nm) was calculated using the BJH model [17].…”

Section: Characteristics Of the Adsorbent And Solution Usedmentioning

confidence: 99%

“…The fast Cs + sorption kinetics measured for S202 [11] suggest that this material should remain effective in column processes at high flow rates. Studies in batch processes with freshwater have shown that competitive effects involving naturally present cations should be taken into account however [11]. A model was also developed in this study that reproduced the experimental data points precisely, especially at low Cs + concentrations.…”

Section: Introductionmentioning

confidence: 99%

“…One way to overcome these drawbacks is to insert selective ferrocyanide (hexacyanoferrate) nanoparticles in a solid porous matrix to make it amenable to column processes: the porosity of the support and the high surface/volume ratio of the hexacyanoferrate particles inside the pores improves the adsorption rate. Numerous composite solids (organic or inorganic) loaded with hexacyanoferrate particles have thus been proposed for cesium removal in the past few years [1][2][3][4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Breakthrough studies of the adsorption of Cs from freshwater using a mesoporous silica material containing ferrocyanide

Michel

Barré

Guiza

et al. 2018

Chemical Engineering Journal

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The selectivity and fast exchange kinetics of porous silica adsorbents containing Cu or K ferrocyanide make them ideal candidates for the column decontamination of 137 Cs effluents. The exchange thermodynamics of the K + ions in Sorbmatech® (S202, one such adsorbent) with the major cations present in natural (fresh or sea) water have recently been studied in competition with Cs + sorption to properly model batch data. This article reports an evaluation of this material for continuous, column processes of freshwater decontamination. Experimental data show that its performance is excellent under these conditions, with a steep breakthrough curve of Cs at column exit. The sorption capacity of S202 is completely retained at high flow rates (up to 10 m•h −1 Darcy velocity) and its column behavior remains ideal down to a height/diameter ratio of 2. A reactive transport model accounting for 2 dispersive flow through the bed coupled to ion diffusion and exchange inside the porous adsorbent grains accurately reproduces the experimental data.

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Section: Characteristics Of the Adsorbent And Solution Usedmentioning

confidence: 99%

Section: Characteristics Of the Adsorbent And Solution Usedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Breakthrough studies of the adsorption of Cs from freshwater using a mesoporous silica material containing ferrocyanide

Michel

Barré

Guiza

et al. 2018

Chemical Engineering Journal

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“…Recentemente, Michel et al 84 desenvolveu um material adsorvente seletivo para Cs, constituído por nanopartículas de ferrocianeto de potássio/cobre depositadas nos poros de grãos de sílica, destacando a funcionalização da sílica gel e a alta seletividade desses materiais para a captura de íons metálicos radioativos presentes em efluentes contaminados por descargas acidentais.…”

Section: Capacidade De Troca Iônicaunclassified

Silica and its Peculiarities

Gomes¹,

Souza²,

Furtado³

2018

Rev. Virtual Quim

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f‐block MOFs: A Pathway to Heterometallic Transuranics

et al. 2022

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A novel series of heterometallic f-block-frameworks including the first examples of transuranic heterometallic 238 U/ 239 Pu-metal-organic frameworks (MOFs) and a novel monometallic 239 Pu-analog are reported. In combination with theoretical calculations, we probed the kinetics and thermodynamics of heterometallic actinide-(An)-MOF formation and reported the first value of a U-to-Th transmetallation rate. We concluded that formation of uranyl species could be a driving force for solid-state metathesis. Density of states near the Fermi edge, enthalpy of formation, band gap, proton affinity, and thermal/chemical stability were probed as a function of metal ratios. Furthermore, we achieved 97 % of the theoretical maximum capacity for An-integration. These studies shed light on fundamental aspects of actinide chemistry and also foreshadow avenues for the development of emerging classes of An-containing materials, including radioisotope thermoelectric generators or metalloradiopharmaceuticals.

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Ion exchange and structural properties of a new cyanoferrate mesoporous silica material for Cs removal from natural saline waters

Cited by 35 publications

References 31 publications

Breakthrough studies of the adsorption of Cs from freshwater using a mesoporous silica material containing ferrocyanide

Breakthrough studies of the adsorption of Cs from freshwater using a mesoporous silica material containing ferrocyanide

Silica and its Peculiarities

f‐block MOFs: A Pathway to Heterometallic Transuranics

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