CHRISTINA APARECIDA LEAO GUEDES DE OLIVEIRA FORBICINI

CHRISTINA APARECIDA LEAO GUEDES DE OLIVEIRA FORBICINI

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Evaluation of microwave technology in the additional purification of Mo-99, produced from LEU targets
2019 - LANDINI, LILIANE; ARAUJO, SUMAIR G.; FORBICINI, CHRISTINA A.L.G.O.
In the present work, the feasibility of the microwave technology was studied as an additional purification step (sublimation) in the production of Mo-99, via the alkaline dissolution of LEU (low enrichment uranium) targets of UAlx/Al, in the RMB (Brazilian Multipurpose Reactor) project, which is usually accomplished by induction furnace. The intention was to decrease the time spent in this purification step, for later comparison between the methods. Thus, non-radioactive samples of sodium molybdate (solution) and appropriate catalysts/materials (which could withstand up to 1300°C) were prepared and employed. All experiments were performed in a microwave oven scale (1000W/2.45GHz), under atmospheric pressure. Considering that the experiments with induction furnace lasted from 1.5h to 2h for the sublimation of oxide and molybdenum separation, the preliminary results, obtained in this study, demonstrated the time savings and the possibility of reaching temperatures up to 1200°C in less than 30 minutes. Therefore, the use of this technique is considered promising for this application, although other studies and specific devices are required.
Study of new routes for purification of fission (99)Mo
2019 - DAMASCENO, MARCOS O.; MARQUES, FERNANDA A. da S.; DIAS, RICARDO R.; SANTOS, JACINETE L. dos; FORBICINI, CHRISTINA A.L.G. de O.
99mTc is the most widely applied medical radioisotope in the world, especially for cancer diagnosis procedures. It is provided by 99Mo radioactive decay, which is one of the fission products of irradiated uranium by nuclear reactors. At main production centers, 99Mo chemical processing line up different steps to separate it from other fission products, depending on features of targets or local requirements. In this work, two new routes (MR1 and MR2) for 99Mo purification are presented, called MR1 and MR2, can be set up in the Brazilian Multipurpose Reactor project (RMB). In the first studied route, 99Mo purification initiated by eluting the solution through a Dowex 1x8 resin chromatography column, followed by a second step using a Chelex resin column and finally, the process was finished using an alumina column. For a second route, the first step is also performed with a Dowex 1x8 column, followed by a second separation step using alumina column, and lastly, a sublimation process was carried out in a tubular oven under programmed conditions. The final yield for the MR1 route has reached 84.4% and the overall time process about 7 hours, by contrast, MR2 route came to 75.3% in 9 hours.
Direct oxidation of ethylene glycol on PtSn/C for application in alkaline fuel cell
2017 - SOUZA, LETICIA L. de; OLIVEIRA NETO, ALMIR; FORBICINI, CHRISTINA A.L.G. de O.
PtSn/C electrocatalysts with different molar ratios were synthesized by borohidrate process for glycol ethylene oxidation. All electrocatalysts were, also, characterized by X-ray diffraction (XRD), transmission electronic microscopy (TEM), attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIRS), energy dispersive X-ray (EDX), while the electrochemical activities of those materials were evaluated by cyclic voltammetry, chronoamperometry and polarization curves in Direct Ethylene Glycol Alkaline Fuel Cells (DEGAFC). TEM results for PtSn/C electrocatalysts showed crystallite size of 4 nm. The curves of power density indicated that PtSn/C, with molar ratio of 70:30, presented the best results for glycol ethylene oxidation, in comparison with other alternatives prepared. These results may be associated to the selectivity to form oxalate or a bifunctional mechanism (oxygenated species from Sn).
Recovery of 131I from fission 99Mo production process by distillation method
2017 - DAMASCENO, MARCOS O.; BALOGH, TATIANA S.; FORBICINI, CHRISTINA A.L.G. de O.
The results of one of the recovery stages of 131I as a byproduct of the 99Mo fission production process are presented in this work. A modified wet-distillation apparatus was used for iodide purification and some work parameters were tested. The assays included iodide anion eluent, concentration of H2SO4, H2O2, the catalyst effect of MoO3, temperature and time process. The results of eluting anions demonstrated lower recovery of 131I using nitrate salt. The sulfate solution and its respective acid (H2SO4) at concentration 1.6 M, presented better results. Hydrogen peroxide was used as a main oxidant of the ions iodide, the experiments realized with 6 mL of H2O2 3% showed higher recovery than assays prepared with H2O2 higher and lower amount. Molybdenum oxide was evaluated as catalyst of iodine in solution; however, the results did not demonstrate an advantage in relation to its absence. In addition, the recovery of iodide was delayed at initial periods of the process in presence of the catalyst, leading to an increase on time process. Temperature decrease of distillation solution from 80 to 50 °C showed advantageous since the recovery yields were similar beside a lower wet drag to trap solution. Time distillation was carried out at least four hours with sampling each hour; the best times were between 1 and 2 hours. Shorter periods of distillation avoid dilution of the capture solution on the further recovery process. Several parameters were studied and it was possible to set up system that provided 131I recovery around 50% yield.
Status report on thechnical progress for LEU-based sup(99)Mo production at IPEN-CNEN/SP, Brazil - Modified Cintichem process
2015 - OSSO JUNIOR, J.A.; DIAS, C.R.B.R.; TEODORO, R.; CATANOSO, M.F.; BRAMBILLA, T.P.; POZZO, L.; SQUAIR, P.; FUKUMORI, N.; CARVALHO, F.M.S.; ZINI, J.; CAMILO, R.L.; FORBICINI, C.; YAMAMURA, M.; ARAUJO, I.C.; FREITAS, A.A.; CARVALHO, E.U.; DURAZZO, M.; SILVA, A.M.; PIRES, M.A.; MARUMO, J.T.; DELLAMANO, J.C.; MENGATTI, J.; PERROTTA, J.A.
Otimizacao das condicoes de dissolucao de pastilhas de uranio metalico
1993 - CAMILO, R.L.; KUADA, T.A.; FORBICINI, C.A.L.G.O.; COHEN, V.H.; LOBAO, A.S.T.; ARAUJO, B.F.
Electrocatalysts based on Pt and Lanthanum oxide for the oxygen reduction reaction and application in PEM fuel cell
2012 - VASCONCELLOS, MARI E. de; GOMES, THIAGO B.; SANTORO, THAIS A.B.; OLIVEIRA NETO, ALMIR; SPINACE, ESTEVAM V.; SILVA, DIONISIO F. da; GERALDES, ADRIANA N.; LINARDI, MARCELO; FORBICINI, CHRISTINA A.L.G. de O.
Characterization of lanthanium oxide on the thermal stability of gamma alumina catalyst supports
2007 - ROCHA, S.M.R.; VASCONCELLOS, M.E. de; QUEIROZ, C.A.S.; FORBICINI, C.A.L.G.O.; SENEDA, J.A.; PEDREIRA, W.R.
Preparation of Pt rate earth/C electrocatalysts using the alcohol-reduction process ethanol electro-oxidation
2008 - RODRIGUES, RITA M. de S.; RIBEIRO, VILMARIA A.; BRANDALISE, MICHELE; TUSI, MARCELO M.; LINARDI, MARCELO; FORBICINI, CHRISTINA A.L.G.O.; SPINACE, ESTEVAM V.; OLIVEIRA, ALMIR
Studies on the separation of 99Mo from nitric acid medium by alumina
2010 - YAMAURA, M.; FREITAS, A.A.; YAMAMURA, A.P.G.; TANAKA, R.M.N.; FORBICINI, C.A.L.G. de O.; CAMILO, R.L.; ARAUJO, I.C.