High surface niobium oxide ambigel for simulated nuclear waste immobilization
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2017
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BRAZIL MRS MEETING, 16th
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Niobium is predominantly found in Brazil, and it is, therefore, of great interest to
find new technological applications for Nb and its compounds. It has been
demonstrated that porous niobium oxide glasses can be used to trap nuclear
waste [1]. Glass frits require high energy processes and high sintering
temperature for their production. Ambigels on the other hand can be produced
under ambient conditions (~25 °C, 1 atm.) and due to their high specific area they
require much lower sintering temperatures, two characteristics that attract their
use as hosts for nuclear waste immobilization [2]. In this work, we produced
niobium oxide ambigels intended as host matrix for simulated multicomponent
liquid nuclear waste. We synthetized ambigels using niobium pentachloride
(NbCl5) as precursor, ethanol as solvent and nitric acid as catalyst. Following
rapid gelation the gels were left to age in ethanol, passing to hexane through
sequential solvent exchange until 100% hexane were reached. In the last step, the
gels were dried under ambient conditions for 48 hours. We have produced
ambigels with high specific surface area (> 110 m²/g) and amorphous niobium
oxide phase. The ambigels were impregnated with saline solutions that simulate a
multicomponent nuclear waste. The weight gain after thermal treatment was
determined and used as indicator for the amount immobilized. Nb2O5-based
ambigels can be used as a mesoporous host matrix for nuclear waste
immobilization.
Como referenciar
SOUZA, GRACIANO B. de; MULLER, DALIANA; MELLO-CASTANHO, SONIA R.H.; FALK, GILBERTO; HOTZA, DACHAMIR; RAMBO, CARLOS R. High surface niobium oxide ambigel for simulated nuclear waste immobilization. In: BRAZIL MRS MEETING, 16th, September 10-14, 2017, Gramado, RS. Abstract... São Carlos, SP: Aptor Software, 2017. p. 1773-1773. Disponível em: http://repositorio.ipen.br/handle/123456789/31200. Acesso em: 26 Apr 2024.
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