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Cobalt Ion Sorption Properties of Potassium Niobate Powders Under Hydrothermal Conditions by Hiromichi Hayashi; Akiko Ueda; Yukiya Hakuta is a Engineering article available to read on EtoBox.

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Hydrothermally synthesized potassium hexaniobates powders were used for cobalt ion adsorbent under hydrothermal conditions to evaluate adsorbents for the removal of soluble corrosion-products, mainly 60 Co under pressurized water reactor coolant conditions. Selectivities for transition metal ions increased in the order; Ni 2+ < Mn 2+ < Co 2+ Fe 2+ whereas light brown precipitate took place in the case of Fe 2+ ions. The Co 2+ adsorption capacities at 473 K for the K 4 Nb 6 O 17 hydrothermally synthesized at 573, 673 K and the conventional solid-state synthesized K 4 Nb 6 O 17 were 2.04, 2.25 and 1.98 mmol/g, respectively. Co uptake on the K 4 Nb 6 O 17 hydrothermally synthesized at 673 K was highest among the K 4 Nb 6 O 17 adsorbents examined. Co adsorption capacities at 473 K were exceeded compared to the Co-exchange capacity calculated from the composition. In addition, Co desorption amounts from the adsorbent decreased with an increase in the adsorption temperature and the formation of cobalt niobate (Co 2 Nb 5 O 14 ) was confirmed by the XRD pattern. Therefore, Co can be fixed in the niobate matrix under hydrothermal conditions.

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Author

Hiromichi Hayashi; Akiko Ueda; Yukiya Hakuta

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0896-8446)

Published

2008

Language

EN

Field

Engineering (Physical Sciences)