Capture of iodine from the vapour phase and immobilisation as sodalite

Maddrell, Ewan R.; Vance, E. R.; Gregg, Daniel J.

doi:10.1016/j.jnucmat.2015.09.038

Cited by 29 publications

(22 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Since I À incorporates into sodalite, the nuclear waste community has considered sodalite as a vehicle for immobilizing radioactive iodine-129 in the b-cage. 3,[12][13][14] This is an attractive option because of the feasibility of synthesis at low temperatures (<200°C) to control iodine volatility and because the aluminosilicate framework of the sodalite is compatible with glass matrices used to encapsulate the sodalite crystallites. In addition, chlorosodalite, Na 8 Al 6-Si 6 O 24 Cl 2 , has been studied extensively and has been proposed as the baseline mineral for the spent electrochemical salt waste that would be produced when reprocessing used nuclear fuel via the pyrochemical method.…”

Section: Iodosodalitementioning

confidence: 99%

“…Since I − incorporates into sodalite, the nuclear waste community has considered sodalite as a vehicle for immobilizing radioactive iodine‐129 in the β‐cage . This is an attractive option because of the feasibility of synthesis at low temperatures (<200°C) to control iodine volatility and because the aluminosilicate framework of the sodalite is compatible with glass matrices used to encapsulate the sodalite crystallites.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and characterization of iodosodalite

et al. 2017

View full text Add to dashboard Cite

The effects of six process variables were investigated on the hydrothermal growth of iodosodalite, Na8Al6Si6O24I2: pH (NaOH concentration), aging time, temperature, Al/Si ratio, precursors used (i.e., zeolite 4A, kaolinite, meta‐kaolin, colloidal silica, and sodium aluminate), and precursor concentration. Powder X‐ray diffraction (XRD) with Rietveld refinements, X‐ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) were performed to characterize the structures, phase fractions, chemical state, and surface morphology of the synthesized products. Iodosodalite yield increased as aging time and pH increased. The crystallization of iodosodalite was favored in the temperature range 140°C‐180°C. Decreasing the Al/Si ratio by half increased the crystallization of basic cancrinite. Lowering the precursor concentration by adding water revealed the crystallization of nepheline hydrate I and a decrease in the sodalite fraction. Among the tested precursors, zeolite 4A yielded the highest mass fraction of iodosodalite in the synthesized powders. From the aging time and temperature variation experiments, the phase transformation of zeolite A→sodalite→cancrinite was observed. XPS and FTIR results showed the presence of only iodide but not iodate in the synthesized product. The crystallization of various minerals suggests that mechanisms for transport of the ions and formation of the aluminosilicate frameworks vary with hydrothermal conditions.

show abstract

Section: Iodosodalitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of iodosodalite

et al. 2017

View full text Add to dashboard Cite

show abstract

“…It has been reported that the radioiodine can be fixed in a zeolitic structure such as sodalite (SOD) and cancrinite (CAN) by structurally transforming the iodine-containing zeolites by applying high temperature (>800 • C) and high pressure (>100 MPa). This is known as the hot isostatic pressing technique [1,[13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Immobilization of Radioiodine via an Interzeolite Transformation to Iodosodalite

Kweon

Park³

et al. 2020

Nanomaterials

View full text Add to dashboard Cite

We described a technology for immobilizing radioiodine in the sod-cages by the interzeolite transformation of iodine-containing LTA (zeolite A) and FAU (zeolites X and Y) into a sodalite (SOD) structure. The immobilization of iodine in the sod-cage was confirmed using diverse characterization methods including powder XRD, elemental analysis, SEM–EDS, 127I MAS NMR, and I 3d XPS. Although both zeolites A (Na-A) and X (Na-X) were well converted into SOD structure in the presence of NaI and AgI, the iodide anions were fixed in the sod-cages only when NaI was used. The ability to adsorb methyl iodide (CH3I) was evaluated for zeolites A and X in which Na+ and/or Ag+ ions were exchanged, and Ag+ and zeolite X showed better adsorption properties than Na+ and zeolite A, respectively. However, when both CH3I adsorption ability and the successive immobilization of iodine by interzeolite transformation were considered, Na-X was determined to be the best candidate of adsorbent among the studied zeolites. More than 98% of the iodine was successfully immobilized in the sod-cage in the SOD structure by the interconversion of Na-X following CH3I adsorption, although the Na-X zeolite exhibited half the CH3I adsorption capacity of Ag-X.

show abstract

“…Research within ANSTO Synroc continues to pursue solutions for problematic nuclear waste streams, including solutions for the immobilization of Cs, 111 I, [112][113][114][115] pyroprocessing wastes 116 and particularly Pu-bearing wastes. 99,100,117 Research is also being undertaken at ANSTO for generation IV reactor wastes, and the Synroc process is relevant for graphite and fluoride molten salt wastes.…”

Section: Prospectsmentioning

confidence: 99%

Synroc technology: Perspectives and current status (Review)

et al. 2020

View full text Add to dashboard Cite

Dr Eric (Lou) Vance spent 32 years at the Australian Nuclear Science and Technology Organisation (ANSTO), where he was dedicated to the development of Synroc technology, a waste treatment solution for intractable nuclear wastes. The original form of Synroc, a multiphase ceramic wasteform based on stable and leach resistant titanate minerals, was invented by Australian scientists in the late 1970s. This formulation was directed toward the immobilization of PUREX wastes from the reprocessing of nuclear fuels. Synroc at ANSTO under the scientific leadership of Dr Vance since evolved beyond these original titanate ceramics into a waste treatment technology platform. This platform can be applied to produce glass, glass‐ceramic and ceramic wasteforms and offers distinct advantages in terms of waste loading and suppressing volatile losses. The platform therefore provides an opportunity to treat those waste streams that are problematic for glass matrices alone or existing vitrification process technologies. Such wastes include, for example, actinide‐bearing wastes, those that contain large proportions of refractory elements, those with significant fission product or corrosive volatile emissions and those wastes resulting from radiopharmaceutical production. The implementation of the latter will see the industrialization of Synroc technology via a first‐of‐a‐kind Synroc Waste Treatment Facility that is currently under construction at ANSTO. This paper will review Synroc technology, particularly noting the substantial and essential contributions from the late Dr Vance. The review will also provide some perspective on the development of the technology for nuclear waste immobilization and describe the significant recent advancements at ANSTO.

show abstract

Capture of iodine from the vapour phase and immobilisation as sodalite

Cited by 29 publications

References 3 publications

Synthesis and characterization of iodosodalite

Synthesis and characterization of iodosodalite

Immobilization of Radioiodine via an Interzeolite Transformation to Iodosodalite

Synroc technology: Perspectives and current status (Review)

Contact Info

Product

Resources

About