Iodine Sorption onto Mixed Solid Alumina Cement and Calcium Compounds

Toyohara, Masumitsu; Kaneko, Masaaki; Ueda, Hiroaki; Mitsutsuka, Norimasa; Fujihara, Hiromasa; Murase, T.; Saito, Noriyuki

doi:10.1080/18811248.2000.9714980

Cited by 26 publications

(7 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Macé [25] has measured the R d values of Se(IV) on different cement minerals (C-S-H, ettringite and hydrogarnet) and has observed that the uptake of Se(IV) in HCP suspension is controlled by aluminate phases (hydrogarnet and ettringite) rather than C-S-H phases that are minor contributors in the immobilization of Se(IV). Toyohara et al [26,27] have identified that a hydrogarnet phase (4CaO·Al 2 O 3 ·13H 2 O) controls the uptake of iodide in cement. Bonhoure et al [19] only obtained extremely weak EXAFS oscillations from I − treated unaltered CEM-I HCP and CSH samples, which has limited the interpretation of the EXAFS data.…”

Section: Behaviour Of Anionic Rn In Cement Pastes Suspensions Vs Degmentioning

confidence: 99%

Uptake of anionic radionuclides onto degraded cement pastes and competing effect of organic ligands

Pointeau¹,

Coreau²,

Reiller³

2008

Radiochimica Acta

View full text Add to dashboard Cite

To cite this version:I. Pointeau, N. Coreau, Pascal E. Reiller. Uptake of anionic radionuclides onto degraded cement pastes and competing effect of organic ligands. Radiochimica Acta, R Oldenbourg Verlag GMBH, 2008, 96 (6) .0), corresponding to the decalcification of the calcium silicate hydrate (C-S-H) phases. The behaviour of anionic RN seems to be correlated to the evolution of calcium concentration and is opposed to the evolution of sulphate concentration in solution which could have a competing effect. Comparison is done with the behaviour of caesium and uranium(VI), which is a cationic RN but has a major negative hydrolysed species at high pH. As awaited, the uranium(VI) behaviour is very different from purely anionic RN one in accord with spectroscopic analyses from literature works. The R d values have also been measured for the organic ligands isosaccharinate (ISA) and EDTA. The uptake of ISA can be important and competing effect with the sorption of SeO 3 2− has been evidenced in HCP suspensions as a function of the ISA concentration.

show abstract

Section: Behaviour Of Anionic Rn In Cement Pastes Suspensions Vs Degmentioning

confidence: 99%

Uptake of anionic radionuclides onto degraded cement pastes and competing effect of organic ligands

Pointeau¹,

Coreau²,

Reiller³

2008

Radiochimica Acta

View full text Add to dashboard Cite

show abstract

“…The effect on the measured value of any iodine that might remain absorbed on the filter and the container was not examined because no effect by absorption has been reported. 8) …”

Section: Measurement Of Concentrations In Solution and Solidmentioning

confidence: 97%

“…8) In this study, we performed two kinds of experiments using the hardened product of mixture of alumina cement, CaSO 4 ·2H 2 O, Ca(OH) 2 (weight ratios; 100:50:120, respectively) and water (Material-B). One was the sorption experiment onto Material-B, and the other was the desorption experiment from Material-B with I − that was obtained from the sorption experiment.…”

Section: Introductionmentioning

confidence: 99%

“…6, 7) In a previous report, we proposed a formulation of cement for waste solidification to effectively sorb I − . 8) This cement consists of commercial alumina cement mixed with calcium sulfate (CaSO 4 ·2H 2 O) to a weight ratio of 100:15.5. The hardened product of the mixture of these materials and water (Material-A) raises the iodine distribution coefficient K d between solid and liquid in dual phase mixture to a level that is 0.2 to 1 m 3 /kg higher than the 2×10 −3 m 3 /kg obtainable with Portland cement.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Contribution to Understanding Iodine Sorption Mechanism onto Mixed Solid Alumina Cement and Calcium Compounds

Toyohara

Kaneko

Mitsutsuka

et al. 2002

Journal of Nuclear Science and Technology

Self Cite

View full text Add to dashboard Cite

An experimental study on the iodine sorption mechanism onto mixed solid alumina cement and calcium compounds was carried out. The solids were prepared by mixing the alumina cement with Ca(OH) 2 and/or CaSO 4 ·2H 2 O. Batch experiments were performed for iodine sorption onto the solid and iodine desorption from the solid that was obtained after a sorption experiment. In order to clarify the hydrates in the solids, X-ray diffraction measurement and scanning electron microscopic observation were adopted. The iodine sorption onto the solid proceeded to replace the OH − in 4CaO·Al 2 O 3 ·13H 2 O by I − in solution to form the new hydrate, 3CaO·Al 2 O 3 ·CaI 2 ·12H 2 O. The results of sorption and desorption experiments showed that the iodine sorption proceeded reversibly and was independent of concentration of iodine up to 1×10 −2 mole/dm 3 in solution.

show abstract

“…Several research works are available on the sorption of different oxy anions on goethite and similar oxides extensively used for environmental and radioactive waste management. 4,5) X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) techniques have been used for analyzing the adsorption of Pb(II) 6) and iodine 7) on different ceramic surfaces for understanding the mechanism involved in the adsorption process.…”

Section: Introductionmentioning

confidence: 99%

Studies on Sorption of Antimony on Carbon Steel Surface in Chemical Decontamination Medium

Mittal¹,

Bera²,

Velmurugan³

et al. 2011

J. Nucl. Sci. Technol.

View full text Add to dashboard Cite

Antimony(III) in a mixed solution of nitrilo tri acetic acid, ascorbic acid, and citric acid, known as a chemical decontamination solution, was found to be deposited on a carbon steel (CS) surface under deaerated condition. The deposited antimony on the CS surface was characterized by X-ray photoelectron spectroscopy and X-ray diffraction technique. The deposited material was found to contain elemental Sb and the Fe-Sb-O compound. The characterization results showed the initial adsorption of Sb on CS and the subsequent surface precipitation of the Fe-Sb-O compound. A commercial organic inhibitor Rodine 92B was used to stop the initial adsorption of Sb(III) and further growth of the Fe-Sb-O compound on the CS surface. Nitrogen in the inhibitor was observed to act as the bridging agent between Fe and the inhibitor for growing a layer of the inhibitor that stopped the adsorption of Sb. The work has direct relevance to nuclear reactors in terms of prevention of deposition of radioactive antimony on CS surfaces during chemical decontamination.

show abstract

Iodine Sorption onto Mixed Solid Alumina Cement and Calcium Compounds

Cited by 26 publications

References 11 publications

Uptake of anionic radionuclides onto degraded cement pastes and competing effect of organic ligands

Uptake of anionic radionuclides onto degraded cement pastes and competing effect of organic ligands

Contribution to Understanding Iodine Sorption Mechanism onto Mixed Solid Alumina Cement and Calcium Compounds

Studies on Sorption of Antimony on Carbon Steel Surface in Chemical Decontamination Medium

Contact Info

Product

Resources

About