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Microstructural evaluation of initial dissolution of aluminosilicate particles and formation of geopolymer material

Particuology 2018年第6期16卷 101-111页

作者： Rozineide A.Antunes Boca Santa Julia Cristie Kessler Cintia Soares humberto gracher riella Department of Chemical Engineering Federal University of Santa CatannaP.O.Box 476TrindadeFlorianopolis88040-900SCBrazil

The rheological behavior of microparticulate structures of geopolymers was *** materials were developed from alternative sources of aluminosilicate and were activated in different concentrations using 5,10,and 15M sodium hydroxide,and sodium silicate,which were added in a 2:1ratio (by volume).The solid constituents used were bottom ash/metakaolin and neat metakaolin in a 2:1blend. The theological characteristics were determined after 5min of homogenization and a subsequent curing of the pastes at room temperature for 28 *** materials presented amorphous characteristics, which confirmed the formation of geopolymers.A thixotropic behavior was observed for all forrfiulations,except for bottom ash/metakaolin activated at 5M,which resulted in geopolymers with a lower intensity compared with those activated at 10 and 15M,High activator concentrations exhibited a proportional relationship for geopolymer ring growth,which resulted in a reduced structure mobility and, consequently,an increased viscosity and yield *** effects are more evident in the metakaolin samples,and are associated with the water content that is required for *** that were activated with 10M sodium hydroxide presented a favorable workability and particle packing,in terms of the theological and structural aspects.

关键词： Metakaolin Bottom ash Alkaline activation Geopolymer particle Microstructural Rheology

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Determination of Uranium Traces in Nuclear Reactor IEA-R1 Pool Water

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World Journal of Nuclear Science and Technology 2017年第3期7卷 155-166页

作者： Adonis Marcelo Saliba-Silva Olair dos Santos Elita Fontenele Urano de Carvalho humberto gracher riella Michelangelo Durazzo Nuclear and Energy Research Institute—IPEN/CNEN-SP S&atilde o Paulo Brazil Chemical Engineering Department Santa Catarina Federal University Florianópolis Brazil

IEA-R1 nuclear reactor operation has the routine to control uranium content in pool water to be in trace range below 50 μg/L. There are several routes to determine the uranium trace content in water in the literature;voltammetry has been systematically employed. In the present study, the chosen chemical determination of uranium traces used the voltammetric method known as AdCSV (adsorptive cathodic stripping voltammetry). This technique, based on mercury voltammetry, is an adequate methodology to determine uranium traces. The chloranilic acid [CAA] (2,5-dichloro-3,6-dihydroxy-1,4-benzo-quinone) is indicated as chelating agent. The redox reaction of UO2+2?with CAA is sensitive in the range of 2 2(CAA)2] reduction potential. In this work, we present the uranium trace results for IEA-R1 reactor water, sampled after an operation routine shutdown. The uranium trace determination for IEA-R1 pool water showed content around 1 μg/L [U] with statistical significance. Therefore the IEA-R1-reactor-water purification showed to be adequate and safe.

关键词： Chloranilic Acid Coolant Water Research Reactor Uranium Voltammetry Uranium Traces

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