A new partitioning process for high-level liquid waste by extraction chromatography using silica-substrate chelating agent impregnated adsorbents

Zhang, Anyun; Wei, Yuezhou; Kumagai, Mikio; Koma, Yoshikazu

doi:10.1016/j.jallcom.2004.08.034

Cited by 50 publications

(21 citation statements)

References 21 publications

(24 reference statements)

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“…Several multi-cycle partition processes have been developed in order to treat high-level radioactive liquid waste (HLLW), [1][2][3][4][5][6]. Generally speaking, after the partition process, alkali borosilicate glasses are the matrix of choice for the immobilization of the HLLW, since they permit vitrification of waste stream of variable composition.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Molybdenum Ion in Nitric Acid Solution by Using a Pb-Fe Based Adsorbent

Dodbiba

Lee

et al. 2010

Int.J.Soc.Mater.Eng.Resour.

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Experimental Synthesis of the Pb-Fe based AdsorbentsEach Pb-Fe based adsorbents was precipitated (at 25℃) by adding sodium hydroxide (NaOH) in a mixture of 1 mol/L lead nitrate Pb(NO 3 ) 2 and 1 mol/L ferric nitrate (Fe(NO 3 ) 3 . 9 H 2 O) aqueous solutions, until pH of the mixture was adjusted to a desired value. The suspensions were then filtered and the precipitates were dried at 70℃ for over 72 hrs. Finally, each precipitate was ground by using an agate mortar with pestle to obtain a fine powder, which has been used as an adsorbent. In same cases, prior to the adsorption experiment, the prepared powder was also calcinated at a temperature between 100 and 800℃.The synthesized adsorbents were characterized by means of a thermogravimetric analyzer (TG/DTA: Shimadzu DTG-50), a X-ray diffractometer (XRD: Mac Science, MO3XHF), and a scanning electron microscope (SEM: Keyence, VE-8800). -mail: dodbiba@geosys.t.u-tokyo.ac.jp In order to remove molybdenum (Mo) from the high-level radioactive liquid waste (HLLW), Pb-Fe based adsorbents were synthesized and their adsorption capacities were investigated. The adsorbent precursors were prepared with precipitation at various pH values by adding sodium hydroxide into a mixture of 1 mol/L lead nitrate and 1 mol/L ferric nitrate aqueous solutions, and each precipitate was then filtered, dried and ground to obtain a fine powder precursor. The precursors were also calcinated at various temperatures to obtain the Pb-Fe based adsorbents. Adsorption of Molybdenum Ion in Nitric AcidETwo main parameters were considered when synthesizing the adsorbents, i.e. the pH value of precipitation of adsorbent precursor as well as the calcination temperature of the Pb-Fe based adsorbent. The experimental results indicated that the calcination temperature has a great influence on adsorption capacity of the Pb-Fe based adsorbent for Mo. It was found that when the precursor was precipitated at pH 9 and then calcinated at 500℃, the sorbed amount of Mo by the adsorbent was the highest. In addition, the equilibrium sorption isotherm of Mo onto the adsorbent was estimated by the Langmuir, Freundlich and Redlich-Peterson sorption models. We found that the overall adsorption process was described well by Redlich-Peterson sorption isotherm equation.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Molybdenum Ion in Nitric Acid Solution by Using a Pb-Fe Based Adsorbent

Dodbiba

Lee

et al. 2010

Int.J.Soc.Mater.Eng.Resour.

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“…In many partitioning methods using extraction chromatography, MA(III) separation from the raffinate is achieved using a two-column unit system corresponding to MA(III) À Ln(III) recovery and MA(III)/Ln(III) separation, which is similar to the solvent extraction process. [6][7][8][9][10][11][12] In this study, the authors attempted MA(III) direct separation from simulated raffinate using a novel single-column unit system. The partitioning plant for the fast reactor cycle using the singlecolumn unit system will be a simple and compact structure compared with the two-column unit system.…”

Section: 3)mentioning

confidence: 99%

Separation of Trivalent Minor Actinides from Fission Products Using Single R-BTP Column Extraction Chromatography

Matsumura

MATSUMURA

Morita

et al. 2011

Journal of Nuclear Science and Technology

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“…Based on the macroporous silica-based composite and the MAREC (Minor Actinides Recovery from HLW by Extraction Chromatography) process developed previously, [12][13][14] an advanced chromatographic separation technology entitled SPEC (Strontium/Cesium Partitioning from HLW by Extraction Chromatography) process as shown in Figure 2 has been developed recently. 15,16 It was used specially to recover two heat emitting nuclides, Cs(I) and Sr(II), from an acidic HLW.…”

Section: Introductionmentioning

confidence: 99%

Chromatographic partitioning of cesium by a macroporous silica‐calix[4]arene‐crown supramolecular recognition composite

Zhang

Chai

2010

AIChE Journal

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A macroporous silica-based 1,3-[(2,4-diethyl-heptylethoxy)oxy]-2,4-crown-6-calix [4]arene (Calix[4]arene-R14) supramolecular recognition polymeric composite, (Calix[4]þOct)/SiO 2 -P, was synthesized. It was performed by impregnating and immobilizing Calix [4]arene-R14 and n-octanol into the pores of the macroporous SiO 2 -P particles support. n-Octanol was used to modify Calix[4]arene-R14 through hydrogen bonding. The effect of eight typical fission products contained in highly active liquid waste (HLW) on the adsorption of Cs(I), one of the heat generators, was investigated at 298 K by examining the effect of contact time and the HNO 3 concentration in a range of 0.3-7.0 M. (Calix[4]þOct)/SiO 2 -P showed excellent adsorption ability and high selectivity for Cs(I) at 4.0 M HNO 3 over the tested elements. The partitioning of Cs(I) from a simulated HLW was operated by (Calix[4]þOct)/SiO 2 -P packed column. Cs(I) was able to be effectively eluted by water and separated from the tested metals. It is demonstrated that (Calix[4]þOct)/SiO 2 -P is promising to apply in chromatographic separation of Cs(I) from HLW.

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A new partitioning process for high-level liquid waste by extraction chromatography using silica-substrate chelating agent impregnated adsorbents

Cited by 50 publications

References 21 publications

Adsorption of Molybdenum Ion in Nitric Acid Solution by Using a Pb-Fe Based Adsorbent

Adsorption of Molybdenum Ion in Nitric Acid Solution by Using a Pb-Fe Based Adsorbent

Separation of Trivalent Minor Actinides from Fission Products Using Single R-BTP Column Extraction Chromatography

Chromatographic partitioning of cesium by a macroporous silica‐calix[4]arene‐crown supramolecular recognition composite

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