| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Olin, Markus
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2017Effect of layer charge on the crystalline swelling of Na+, K+ and Ca2+ montmorillonites : DFT and molecular dynamics studiescitations
- 2016Effect of layer charge on the crystalline swelling of Na+, K+ and Ca2+ montmorillonites: DFT and molecular dynamics studiescitations
- 2013Evidence for internal diffusion of sulphide from groundwater into grain boundaries ahead of crack tip in Cu OFP coppercitations
- 2011Sulphide induced stress corrosion cracking of copper
- 2003Adsorption studies on iron oxides with reference to the oxide films formed on material surfaces in nuclear power plants
- 2000AGE special report
Places of action
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report
Adsorption studies on iron oxides with reference to the oxide films formed on material surfaces in nuclear power plants
Abstract
The construction materials used in coolant systems innuclear powerplants become covered with oxide films as aresult of exposure to the aqueouscoolant. The presentwork belongs to a research program on the properties ofsuch films and especially on the transport of inorganicspecies through thefilms. The focus is on theincorporation of the highly energetic long-livedcobaltisotope 60Co in the films causing build-up of radiationfields in theout-of-core system. The present report concentrates on experimentaladsorption studies both in ambient conditions and inhigh-temperature (573 Kand 507 K), high-pressureconditions closely resembling those prevailing inthecooling circuits of nuclear power plants. In addition tocobaltadsorption, adsorption of zinc and nickel werestudied, as a novel method todecrease the activityincorporation due to 60Co is injection of zinc into theprimary coolant. Potentiometric acid-base titrations ofhematitesuspensions were conducted in the presence andabsence of adsorbing metalcations (Zn2+, Co2+, Ni2+).Qualitatively the effect of adsorbed metal cationisnoticed as a shift in the potentiometric titration curve,at a given pHmore base is consumed due to the metaladsorption. Adsorption of inorganicsolutes on oxide surfaces isnowadays most frequently modelled by employingthesurface complexation approach, which was succesfully usedalso in thisstudy to explain the results of theroom-temperature experiments. However, itwas found thata simple surface complexation model was not accurateenoughto reproduce the high-temperature titration datain the presence of a metalcation. A reasonable fit ofthe high-temperature experimental data wasobtained byextending the surface complexation model to take intoaccountsurface precipitation. The tentative equilibriumconstants of the adsorptionreactions, extracted byFITEQL version 4.0 modelling software, were used tocalculate high-temperature adsorption edges. Althoughthere seems to bepractically no difference in thehigh-temperature adsorption affinitiesbetween zinc andcobalt, it is easy to understand that zinc can, however,beused to retard cobalt adsorption provided that zincconcentration in thesolution is considerable higher thancobalt concentration.