Effective separation of palladium from simulated high level radioactive waste

Parajuli, Durga; Hirota, Kouichi; Seko, Noriaki

doi:10.1007/s10967-010-0870-4

Cited by 20 publications

(10 citation statements)

References 26 publications

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“…The most advantage of ion-imprinted technique is the ability to enhance the selectivity for the imprinting metal ion. To evaluate the selectivity of ion-imprinted materials, competitive experiments were carried out with the common ions in simulated high-level liquid waste (like Nd, Eu, Sm, La, Gd, Zr, Na, U, Sr, Cs, Ni, Mn, Co, Cr, Ba and Zn) 38,39 at pH = 5.2 and 1 mol/L HNO 3 solution, respectively.…”

Section: Resultsmentioning

confidence: 99%

Ion-Imprinted Mesoporous Silica for Selective Removal of Uranium from Highly Acidic and Radioactive Effluent

Yang

Qian

Kuang

et al. 2017

ACS Appl. Mater. Interfaces

123

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It is strategically important to recycle uranium from radioactive liquid wastes for future uranium supply of nuclear energy. However, it is still a challenge to adsorb uranium selectively from highly acidic and radioactive waste. In this paper, we report a novel strategy for effective uranium removal from highly acidic and radioactive media by surface ion-imprinted mesoporous silica sorbent. The sorbent was successfully synthesized by a co-condensation method with uranyl as the template ion and diethylphosphatoethyltriethoxysilane as the functional ligands. The pseudo-second-order model and Langmuir model showed better correlation with the sorption kinetic and isotherm data, and the sorption equilibrium could be reached within 40 min, the maximum adsorption capacity from Langmuir model was 80 mg/g in 1 mol/L nitric acid (HNO) solution at 298.15 K. The sorbent showed faster kinetics and higher selectivity toward uranium over other ions compared with nonimprinted mesoporous and other previous sorbents. Furthermore, the ion-imprinted materials exhibited remarkable radioresistance stability and could be regenerated efficiently after five cycles. This work may provide a new approach for highly efficient sorption of uranium from strong HNO and radioactive media.

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Section: Resultsmentioning

confidence: 99%

Ion-Imprinted Mesoporous Silica for Selective Removal of Uranium from Highly Acidic and Radioactive Effluent

Yang

Qian

Kuang

et al. 2017

ACS Appl. Mater. Interfaces

123

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“…They are renowned for their wide application in solvent extraction (Uzoukwu & Mbonu, 2003;Eyal, Baniel, Hajdu, & Mizrahi, 1990;Barkat, Kameche, Tayeb, Benabdellah, & Derriche, 2004) studies and have recently attracted much attention due to their potential application in electronic (Lu et al, 2008) and spent fuel (Zhang, Wanyan, & Kumagai, 2004;Parajuli, Hirota, & Seko, 2011;Mezhov, Kuchumov, & Druzhenkov, 2002) reprocessing programmers. Beta-diketones as bidentate ligands employ the O=C-C=C-OH moiety as the principal functional group in their complication reactions with transition metals.…”

Section: Introductionmentioning

confidence: 99%

Distribution of U(VI) from Aqueous Solutions into Chloroform Solution of N,N’-Ethylenebis (4-butanoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneimine) Schiff Base

Godwin

Uzoukwu

2012

IJC

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The distribution of U(VI) from aqueous media into chloroform solution of N,N'-ethylenebis (4-butanoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneimine) (H 2 BuEtP) a Schiff base has been studied to determine the effect of buffer media, mineral acids, auxiliary complexing agents and 4-butanoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-one (HBuP) on the distribution behaviour. A 1:1 interaction was observed between U(VI) and the ligand during the extraction process and one mole of hydrogen ion was found to have been displaced in the reaction process. The study shows that pH½ of the extraction of U(VI) shifted from 4.88 ± 0.10 to 2.14 ± 0.10 for CHCl 3 solutions of H 2 BuEtP and H 2 BuEtP-HBuP respectively. Extraction constants (Log K ex ) -1.68 ± 0.12 and -0.72 ± 0.13 were determined respectively from the studies, indicating that addition of HBuP made the extraction process more efficient. Species extracted were characterized as complexes with suggested formulae UO 2 (HBuEtP)X and UO 2 (HBuEtP)X.HBuP where X is an anion. Graphical analysis shows also that UO 2 (HBuEtP)X.HBuP could be extracted as UO 2 (BuP)X.(H 2 BuEtP), indicating a potential synthetic method for metal complex species with position isomers by liquid-liquid extraction technique. Studies of extraction from auxiliary complexing agents support the existence of species proposed above leading to enhanced extraction of U(VI) from X = NO 3 -, SO 4 2 , CH 3 COO -,SCN -, Cl -, I -and F -media. Percentage extraction of U(VI) from mineral acids suggests that U(VI) extraction tend to increase with decrease in acid strength.

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“…For comparison, commercially available DIAION CR11 (Mitsubishi Chemicals Co., Japan) was used as the chelating bead with a functional moiety of an iminodiacetate group. [24,25] …”

Section: Methodsmentioning

confidence: 99%

Crosslinked-Chelating Porous Sheet with High Dynamic Binding Capacity of Metal Ions

Wada¹,

Ishihara²,

Miyoshi³

et al. 2013

Solvent Extraction and Ion Exchange

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A crosslinked chelating porous sheet was prepared by cografting ethylene glycol dimethacrylate (EGDMA) with glycidyl methacrylate onto an electron-beam-irradiated porous polyethylene sheet, followed by the introduction of an iminodiacetate group. At a molar percentage of EGDMA of 1.0 mol%, the sheet exhibited a maximum dynamic binding capacity for copper ions of 0.93 mmol/g, while the equilibrium binding capacity remained the same (1.2 mmol/g) as that of a non-crosslinked chelating porous sheet. The crosslinking of the grafted chain causes copper ions to lower their diffusion rate along the sheet thickness driven by the gradient of the amount of copper ions adsorbed.

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Effective separation of palladium from simulated high level radioactive waste

Cited by 20 publications

References 26 publications

Ion-Imprinted Mesoporous Silica for Selective Removal of Uranium from Highly Acidic and Radioactive Effluent

Ion-Imprinted Mesoporous Silica for Selective Removal of Uranium from Highly Acidic and Radioactive Effluent

Distribution of U(VI) from Aqueous Solutions into Chloroform Solution of N,N’-Ethylenebis (4-butanoyl-2,4-dihydro-5-methyl-2-phenyl-3H-pyrazol-3-oneimine) Schiff Base

Crosslinked-Chelating Porous Sheet with High Dynamic Binding Capacity of Metal Ions

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