scholarly journals Modeling ion exchange performance of crystalline silicotitanate to support SRS tank 10H closure (U)

2017 ◽  
Author(s):  
T. Hang ◽  
D. McCabe ◽  
L. Hamm ◽  
J. Wohlwend
Keyword(s):  
Ion Exchange ◽  
Exchange Performance ◽  
Crystalline Silicotitanate

scholarly journals Small to Full-Height Scale Comparisons of Cesium Ion Exchange Performance with Crystalline Silicotitanate

2020 ◽  
Vol 39 (1) ◽  
pp. 104-122
Author(s):  
Amy M. Westesen ◽  
Sandra K. Fiskum ◽  
Truc T. Trang-Le ◽  
Andrew M. Carney ◽  
Reid A. Peterson ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Exchange Performance ◽  
Cesium Ion ◽  
Height Scale ◽  
Crystalline Silicotitanate ◽  
Full Height

scholarly journals Small to Full Height Scale Comparisons of Cesium Ion Exchange Performance with Crystalline Silicotitanate

2020 ◽  
Author(s):  
Amy Westesen ◽  
Sandra Fiskum ◽  
Truc LT Trang-Le ◽  
Andrew Carney ◽  
Reid Peterson
Keyword(s):  
Ion Exchange ◽  
Exchange Performance ◽  
Cesium Ion ◽  
Height Scale ◽  
Crystalline Silicotitanate ◽  
Full Height

scholarly journals Ion Exchange Processing of AP-105 Hanford Tank Waste through Crystalline Silicotitanate in a Staged 2- then 3-Column System

2021 ◽  
Author(s):  
Sandra Fiskum ◽  
Amy Westesen ◽  
Andrew Carney ◽  
Truc LT Trang-Le ◽  
Reid Peterson
Keyword(s):  
Ion Exchange ◽  
Column System ◽  
Crystalline Silicotitanate ◽  
Tank Waste

scholarly journals The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate-Polyacrylonitrile (AMP-PAN) Composites

2019 ◽  
Author(s):  
Alistair Holdsworth ◽  
Harry Eccles ◽  
daniel rowbotham ◽  
Adam Brookfield ◽  
David Collison ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Gamma Irradiation ◽  
Fuel Cycle ◽  
Radioactive Isotopes ◽  
Limited Attention ◽  
Spent Fuel ◽  
Physiochemical Properties ◽  
Exchange Performance ◽  
Effects Of Radiation ◽  
By Products

Managing certain by-products of the nuclear fuel cycle, such as the radioactive isotopes of caesium: Cs-134, Cs-135 and Cs-137 is challenging due to their environmental mobility and radioactivity. While a great many materials can isolate Cs<sup>+</sup> ions from neutral or basic aqueous solutions via ion exchange, few of these, with the exception of ammonium phosphomolybdate (AMP), function effectively in acidic media. The use of AMP, and its porous composite in polyacrylonitrile (PAN) for management of Cs radioisotopes in various nuclear wastes have been known for decades and are well studied, yet the effects of radiation on the physiochemical properties of such composites have only received limited attention to date. In a previous publication, we demonstrated that a 100 kGy gamma irradiation dose has negligible effect on the ion exchange performance of AMP and AMP-PAN with respect to capacity or kinetics under the Cs<sup>+</sup> concentrations and acidity found in spent fuel recycling. As a continuation of this prior study, in this publication we explore the effects of gamma irradiation on the physiochemical properties of AMP and AMP-PAN using a range of characterisation methods. The effects of the same gamma dose on the oxidation state of Mo in AMP and AMP-PAN, the thermal degradation of both AMP and AMP-PAN, combined with a first study into the high-temperature degradation AMP, are reported. The implications of irradiation, its possible mechanism, the conditions present in SNF recycling, and for the end-of-life disposal or recycling of these materials are also discussed.

Effect of Coal Property and Ratio of Acid to Coal on Ion Exchange Performance of Sulfonated Coal

2013 ◽  
Vol 807-809 ◽  
pp. 1493-1496 ◽  
Author(s):  
Qing Jie Tang ◽  
Jun Tao Xing ◽  
Li Peng Zhao ◽  
Bei Bei Gao
Keyword(s):  
Ion Exchange ◽  
Brown Coal ◽  
Raw Material ◽  
Lower Price ◽  
Exchange Property ◽  
Coal Quality ◽  
Exchange Performance ◽  
Coal Property ◽  
Exchange Properties

There are more advantage for Sulfonated coal such as lower price, materials widely, and stronger ion exchange performance. Sulfonated coal were prepared by huolinhe brown coal and shanxi anthracite as raw material, and the effect of coal quality, ratio of acid to coal on the ion exchange properties of sulfonated coal were studied. Results show that the brown coal is more advantageous to sulfonation reaction, the temperature is 120, sulfonated time is 9 h, and ratio of acid to coal is 5:1. Under the conditions, the ion exchange property of sulfonated coal is best.

Ion Exchange of Selected Group II Metals and Lead by Crystalline Silicotitanate and Competition for Cs Exchange Sites

2020 ◽  
Vol 39 (1) ◽  
pp. 90-103
Author(s):  
Emily L. Campbell ◽  
Sandra K. Fiskum ◽  
Truc T. Trang-Le ◽  
Reid A. Peterson
Keyword(s):  
Ion Exchange ◽  
Crystalline Silicotitanate ◽  
Group Ii

Small- to large-scale comparisons of cesium ion exchange performance with spherical resorcinol formaldehyde resin

2019 ◽  
Vol 54 (12) ◽  
pp. 1922-1931 ◽  
Author(s):  
Sandra K. Fiskum ◽  
Reid A. Peterson ◽  
Heather A. Colburn ◽  
Margaret R. Smoot ◽  
Matthew R. Landon ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Large Scale ◽  
Formaldehyde Resin ◽  
Resorcinol Formaldehyde ◽  
Exchange Performance ◽  
Cesium Ion

scholarly journals The Effect of Gamma Irradiation on the Physiochemical Properties of Caesium-Selective Ammonium Phosphomolybdate–Polyacrylonitrile (AMP–PAN) Composites

2019 ◽  
Vol 1 (1) ◽  
pp. 294-310
Author(s):  
Holdsworth ◽  
Eccles ◽  
Rowbotham ◽  
Brookfield ◽  
Collison ◽  
...  
Keyword(s):  
Ion Exchange ◽  
Gamma Irradiation ◽  
Nuclear Fuel ◽  
Spent Nuclear Fuel ◽  
Fuel Cycle ◽  
Radioactive Isotopes ◽  
Limited Attention ◽  
Physiochemical Properties ◽  
Exchange Performance ◽  
Effects Of Radiation

Managing certain by-products of the nuclear fuel cycle, such as the radioactive isotopes of caesium: 134Cs, 135Cs and 137Cs is challenging due to their environmental mobility and radioactivity. While a great many materials can isolate Cs+ ions from neutral or basic aqueous solutions via ion exchange, few of these, with the exception of ammonium phosphomolybdate (AMP), function effectively in acidic media. The use of AMP, and its porous composite in polyacrylonitrile (PAN) for management of Cs radioisotopes in various nuclear wastes have been known for decades and are well studied, yet the effects of radiation on the physiochemical properties of such composites have only received limited attention to date. In a previous publication, we demonstrated that a 100 kGy gamma irradiation dose has negligible effect on the ion exchange performance of AMP and AMP–PAN with respect to capacity or kinetics under the Cs+ concentrations and acidity found in spent nuclear fuel (SNF) recycling. As a continuation of this prior study, in this publication we explore the effects of gamma irradiation on the physiochemical properties of AMP and AMP–PAN using a range of characterisation methods. The effects of the same gamma dose on the oxidation state of Mo in AMP and AMP–PAN, the thermal degradation of both AMP and AMP–PAN, combined with a first study into the high-temperature degradation AMP, are reported. The implications of irradiation, its possible mechanism, the conditions present in SNF recycling, and for the end-of-life disposal or recycling of these materials are also discussed.

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