Study on selective separation of cesium from high level liquid waste using a macroporous silica-based supramolecular recognition absorbent

Wu, Yan; Kim, S.-Y.; Tozawa, Daisuke; Itô, Tatsuya; Tada, Tsukasa; Hitomi, Keitaro; Kuraoka, Etsushu; Yamazaki, H.; Ishii, K.

doi:10.1007/s10967-012-1738-6

Cited by 33 publications

(8 citation statements)

References 24 publications

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“…The + DtBuCH 18 C 6 )/SiO 2 -P in HNO 3 was similar to that of Calix [4] or DtBuCH 18 C 6 -loaded SiO 2 -P [18][19][20]. The Adsorbent…”

Section: Effect Of Hno 3 Concentration On K Dmentioning

confidence: 59%

“…Therefore, recovering metal ions from aqueous solution by immobilizing organic extractants into SiO 2 -P is a promising technique for separating Cs(I) and Sr(II). We previously developed types of novel silica-based Calix [4]arene and crown ether supramolecular recognition adsorbents to selectively separate Cs(I) and Sr(II) from HLLW [16,18,19]. In this study, we attempted to load Calix [4]arene-R14 and DtBuCH 18 C 6 into SiO 2 -P ((Calix [4] + DtBuCH 18 C 6 )/SiO 2 -P) for simultaneous selective separation of Cs(I) and Sr(II) from HLLW.…”

Section: Introductionmentioning

confidence: 99%

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Simultaneous separation and recovery of Cs(I) and Sr(II) using a hybrid macrocyclic compounds loaded adsorbent. Kinetic, equilibrium and dynamic adsorption studies

Zhang

Kim

et al. 2016

Journal of Nuclear Science and Technology

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In this study, simultaneous separation and recovery of Cs(I) and Sr(II) from nitric acid solution was investigated using a silica-based hybrid adsorbent. The adsorbent was prepared by successive impregnation and fixing of two supramolecular recognition agents namely, 1,3-[(2,4-diethylheptylethoxy)oxy]-2,4-crown-6-Calix[4]-arene(Calix[4]arene-R14) and 4' ,4' (5")-di(tertbutylcyclohexano)-18-crown-6, onto a silica-based polymer support(SiO 2 -P). Uptake properties, characterization, equilibrium kinetics, and dynamic adsorption properties of Cs(I) and Sr(II) were then assessed. Distribution coefficients (K d ) higher than 10 2 cm 3 /g for Cs(I) and Sr(II) were obtained using 3 M HNO 3 at 298 K, and the K d values decreased with increasing temperature. Adsorption kinetics and equilibrium studies fitted well with pseudo-second-order model and RedlichPeterson isotherm model, respectively. The constant total organic carbon values in the aqueous phase were obtained after adding 10 −3 ∼ 4 M HNO 3 . Results of the dynamic adsorption/elution test indicated that Cs(I) and Sr(II) were efficiently and simultaneously captured and eluted even under a flow rate of 1.5 cm 3 /min.

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“…The + DtBuCH 18 C 6 )/SiO 2 -P in HNO 3 was similar to that of Calix [4] or DtBuCH 18 C 6 -loaded SiO 2 -P [18][19][20]. The Adsorbent…”

Section: Effect Of Hno 3 Concentration On K Dmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Simultaneous separation and recovery of Cs(I) and Sr(II) using a hybrid macrocyclic compounds loaded adsorbent. Kinetic, equilibrium and dynamic adsorption studies

Zhang

Kim

et al. 2016

Journal of Nuclear Science and Technology

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“…5d, f) and the recovery process for the digesting agents would considerably enhance the average concentration of radionuclides compared to those in the wood [15,16], developing methods to remove 137 Cs from black liquor is necessary to reduce not only the exposure to workers in pulp plants but also the discharge of 137 Cs into aquatic ecosystems. The application of a Cs-selective absorbent used to remove 137 Cs from radioactive water appears to be a promising choice [17][18][19][20].…”

Section: Use Of 137 Cs Contaminated C Japonica Wood In Pulp Millsmentioning

confidence: 99%

Decontamination of Cs from Japanese cedar (Cryptomeria japonica) via kraft cooking

et al. 2017

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To investigate the possibility of decontaminating 137 Cs-contaminated Cryptomeria japonica wood, kraft pulping was conducted and the Cs behavior in the reaction process was examined. 133 Cs-treated or 137 Cs-contaminated bark, sapwood, and heartwood chips of Cryptomeria japonica were digested using an aqueous solution of NaOH and Na 2 S. The pulp was washed with ultrapure water and filtered, after which the filtrate (black liquor) was collected. The black liquor was acidified to separate the supernatant and precipitation. The Cs (133 Cs and 137 Cs) concentrations in the chip and reaction products were measured. As for wood samples, the majority of Cs was present in black liquor, while only a minor amount of Cs was retained in the pulp (\1%). In the case of bark, although the majority of Cs was present in the black liquor, the proportion of Cs in the pulp was much higher than that in the wood pulp. In addition, the Cs in the precipitation of the bark was higher than that in the wood, possibly because the Cs in the bark was combined with some components, which is insoluble in alkaline solution. Our results suggest that 137 Cs-contaminated Cryptomeria japonica wood can be used in the pulp and paper industries.

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“…However, radioactive cesium, barium, strontium, and yttrium contained in the vitrified HLLW generate a lot of heat as a consequence of their radioactive decay; in fact, the heat generated by these radionuclides accounts for 80% of the heat generated by the vitrified HLLW. Therefore, removing these exothermic nuclides from the HLLW is assumed to contribute to the efficient disposal of the vitrified HLLW [1][2][3] .…”

Section: Introductionmentioning

confidence: 99%

Adsorption Behavior of Sr and Ba Using TDS-Impregnated Microporous Silica-Based Adsorbents in Nitric Acid Solution

Kawamura

Kudo

Itô

et al. 2022

J.I.E.

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Silica-based adsorbents impregnated tetra-n-butyl thiuram disulfide (TBTDS) or tetrakis (2-ethylhexyl) thiuram disulfide (T(2EH)TDS) as extractants on a macroporous silica/polymer composite support (SiO 2 -P) were prepared to separate barium (Ba) ions from strontium (Sr) ions present in mixed solutions. The Ba and Sr ion adsorption behaviors of each adsorbent were investigating by varying acid concentration, contact time, temperature, and metal concentrations in solution using the batch method. The Ba and Sr adsorption affinities depended on nitric acid concentration, and the difference in distribution coefficient (K d ) between the two ions was maximum in 1 M HNO 3 . Furthermore, results indicated that the adsorption reaction starts several hours after the initial solution-adsorbent contact and reaches equilibrium within 4-10 hours. The dependence for thermal for adsorption indicated to be spontaneous processes. The adsorption mechanisms were investigated by applying two isotherm models. The shapes of the isotherms were different between the TBTDS adsorbent and the T(2EH)TDS adsorbents. The isotherm for the two T(2EH)TDS adsorbents were well fitted by the Langmuir model, but that for TBTDS was S-shaped and more metal ions were adsorbed than the other adsorbents. These results suggest that the Ba and Sr ions could be separated from each other via the batch method using these adsorbents.

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Study on selective separation of cesium from high level liquid waste using a macroporous silica-based supramolecular recognition absorbent

Cited by 33 publications

References 24 publications

Simultaneous separation and recovery of Cs(I) and Sr(II) using a hybrid macrocyclic compounds loaded adsorbent. Kinetic, equilibrium and dynamic adsorption studies

Simultaneous separation and recovery of Cs(I) and Sr(II) using a hybrid macrocyclic compounds loaded adsorbent. Kinetic, equilibrium and dynamic adsorption studies

Decontamination of Cs from Japanese cedar (Cryptomeria japonica) via kraft cooking

Adsorption Behavior of Sr and Ba Using TDS-Impregnated Microporous Silica-Based Adsorbents in Nitric Acid Solution

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