LILIANE LANDINI
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Resumo IPEN-doc 29970 Apoio no processamento de cargas de agro-resíduos com micro-ondas, para a síntese de óxido de grafeno reduzido2023 - CARDOSO, ISADORA de A.; ARAUJO, SUMAIR G. de; LANDINI, LILIANEResumo IPEN-doc 24683 Production of 57Co, 109Cd, 111In and 117mSn using CV-28 cyclotron at IPEN-CNEN/SP2001 - OSSO JUNIOR, J.A.; LANDINI, L.; LION, L.F.; MORAES, V.Several radioisotopes produced in Cyclotrons have physical properties of decay suitable to be used as: radiopharmaceuticals, for in vivo Diagnosis images (with the techniques of SPET and PET, Single Photon Emission Tomography and Positron Emission Tomography, respectively) and for Therapy, in Nuclear Medicine; calibration sources of several instruments applied in the nuclear area and in Metrology; and as radioactive tracers of elements investigated in many fields, such as Chemistry, Physics and Biology. This work describes the production of four of these radioisotopes that are very important in these areas: 57Co, 109Cd, 111ln and 117mSn. They can be obtained using the CV-28 Cyclotron at IPEN, because it can accelerate proton beams with energies up to 24MeV and currents up to 20μA (external). 57Co (t1/2=271.3 d) decays by electron capture to 57Fe with the emission of γ-rays and one characteristic X-ray. It is widely used as calibration source of detectors such as: Ge(Li), Ge(HP), Nal(TI) and dose calibrators (well type detectors). Besides these applications, 57Co Flood Sources are used to test the response uniformity of gamma cameras, in Nuclear Medicine. 109Cd has a half-life of 462.6 d and decays by electron capture to 109Ag with the emission of one γ-ray and one characteristic X-ray. This radioisotope can be employed as calibration source of X-ray and γ-rays detectors; as a radioactive tracer of Cd, an environment pollutant and used in the EDXRF (Energy Dispersion X-Ray Fluorescence) technique. 57Co was produced through the irradiation of natNi. Thick target yields for 55Co, 56Co, 57Co, 58CO, 56Ni and 57Ni were measured and the mean values were 346.69kBq/μA.h (9.37μCi/μA.h), for the direct production of 57Co and 150.59kBq/μA.h (4.07μCi/μA.h), through the decay of 57Ni (11.31 days after EOB - End of Bombardment). A solution of 57CoCl2 was prepared, to fill a flood source for calibration of gamma camera, with activity of 222MBq (6mCi) of 57Co and impurity levels of 1.13 and 1.29% for 56Co and 58Co, respectively, at delivery time. In order to achieve these results, a chemical separation method was developed with a separation yield of 93% for 5'7Co and a negligible loss of Ni. A composite target of Ni and Ag was prepared and a chemical separation method proposed to allow the separation between the targets and the products of interest, 57Co and 109Cd. The yields obtained in the irradiation of the composite target were: 947.94kBq/μA.h (25.62μCi/μA.h) of 57Co - direct reaction, 259-00kBq/μA.h (7μCi/μA.h) of 57Co - indirect reaction (11.31 days after EOB) and 71.41kBq/μA.h (1.93μCi/μA.h) of 109Cd, which showed the efficiency of its use, as well as the chemical separation, with a yield of 80% for 57Co and 109Cd. 111ln (t1/2=67.5 h) has appropriate characteristics for Diagnosis in Nuclear Medicine due to its decay mode (100% by electron capture) and its adequate half-life to slow biological studies, that makes it one of radioisotopes of interest of Brazilian Physicians. It can also be used in angular correlation studies in Nuclear Physics. 111In was produced by the 112Cd(p,2n)111ln reaction, that has the highest yield. The Cd targets were prepared by electroplating of CdSO4 solution in copper and copper/nickel backings. After being irradiated, a chemical separation was performed by an acetic acid extraction method, with an overall recovery yield for 111ln higher than 95%. The level of the chemical impurities of Cd, Ni and Cu were bellow than the permissible values. 117mSn (t1/2=14 d) has suitable characteristics of decay to be used as a tracer of SnCl2 in the labeling of organic molecules with 99mTc and also in radiotherapeutical applications. It was prepared by the irradiation of natural tin through the nuclear reactions natSn(p,xn)117Sb→117mSn. The production thick target yield of 117mSnnn was 784.4kBq/μA.h (21.20μCi/μA.h) and with the proper decay time of its precursor, 117Sb, no radionuclidic impurities appeared in the final product. A chemical separation method was developed to separate first 117Sb from the irradiated Tin and then 117mSn from Sb with a good chemical yield. The quality control procedures showed the good quality of the final product, 117mSn.Artigo IPEN-doc 27414 Study of the feasibility of biodiesel production, from vegetable oils and catalysts of seafood residues, in a batch hydrogenation reaction unit, assisted by microwave and conventional heating2020 - ARAUJO, S.G.; LANDINI, L.; SALVADOR, V.L.R.; SCAPIN, M.A.; MASSANARES, B.F.; URBANINHO, A.B.In this work, it was proposed to study the feasibility of biodiesel production, from residues of vegetable oils used in domestic activities, employing (CaCO3) shells prepared like calcium oxide (CaO) as catalysts, in a batch reaction unit, on bench scale, installed at IPENCNEN/ SP. This unit is capable of operating with high pressure hydrogen gas (up to 200bar) and high temperature (up to 500°C, using microwave - MW (2.450MHz, with up to 2kW continuous and 8kW pulsed) and conventional heating – (electric) MC. In the tests, the oil load (mL), type and mass of catalyst, with or without hydrogen gas pressure (bar), temperature (°C), reaction time (h), microwave power (W), the speed of the load (rpm) agitation and the conventional heating were evaluated. The analytical determinations of the samples were carried out by means of density, gas chromatography (GC) and X-ray fluorescence. Data were collected in order to be compared with other methodologies, already used in the literature. The purpose of this work was to analyze the efficiency of the use of these types of catalysts and oils in the production of biodiesel, as an alternative technology. The Ca and CaO contents found in the pink shell, before and after the calcination, were 36.2% and 98.8%, respectively. The best result obtained for the density was 0.875182g/cm3, for the test with 4g of calcined shell catalyst and reaction of 1h. As to the methyl ester content, the highest result was 95.33%, in a test with 4g of catalyst and reaction of 3h. In the non-calcined shell test (22.5g), although the amount of mass used was much larger (5% of the oil mass), the ester content was very low, 2.11%.Resumo IPEN-doc 26818 Resíduos de frutos do mar2019 - ARAUJO, S.G.; LANDINI, L.; ZEFERINO, G.R.; SALVADOR, V.; SCAPIN, M.A.Resíduos de frutos do mar: oportunidades potenciais para produção de materiais bioativos Resíduos de frutos do mar são fontes ricas em diversos compostos e materiais bioativos e anualmente, no mundo, milhões de toneladas destes resíduos (conchas, ostras, camarões, caranguejos, lagostas, mariscos, etc) são produzidos. No Brasil, cerca de 2 milhões de toneladas somente no Litoral Sul/SP. Com este problema ambiental, há grande geração de resíduos sólidos de atividades pesqueiras e/ou de maricultura,frequentemente despejados em terrenos baldios, aterros sanitários ou no mar. No entanto, eles embutem grande quantidade de elementos/compostos químicos valiosos (cálcio, quintina, pigmentos, proteínas), e poderiam ser usados para diversas aplicações na medicina, industrias farmacêuticas, alimentícias, energéticas, etc., Estes resíduos normalmente têm seus valores potenciais ignorados e o seu aproveitamento diminuiria a agressão ambiental e geraria renda aos maricultores e pescadores Neste trabalho, resíduos de frutos do mar foram calcinados para converter CaCO3 em CaO, sendo um dos catalisadores sólidos heterogêneos, altamente ativo, mais utilizados em reação de transesterificação de óleos vegetais para produção do biodiesel. Eles foram calcinados a 1000°C e usados em pó (100 a 200mesh). A caracterização antes e após calcinação foi por WDXRF (FRX por dispersão de comprimento de onda),. O teor de Ca era de 36,2% e de 98,8% de CaO, respectivamente. As propriedades catalíticas foram verificadas em testes de produção de biodiesel, em uma unidade reacional com micro-ondas do IPEN. O maior teor de éster metílico, em GC, obtido foi de 98%, em um teste de 11g de catalisador (P-300W; t-1h; T-65°C; 600rpm). As densidades ficaram dentro das especificações (850 a 900kg/m3) - 20°C. Com estes estudos, verificou-se que é possível aproveitar diversos tipos de materiais, empregando metodologias alternativas e mais conscientes, para proteção do meio ambiente.Artigo IPEN-doc 26287 Preliminary assessment of the content of rare earth elements, uranium and thorium in tantalite after processing with microwave2019 - ARAUJO, SUMAIR G.; LANDINI, LILIANE; ZEFERINO, GABRIEL R.; SALVADOR, VERA L.R.; SCAPIN, MARCOS A.The microwave application of (MW) was studied with the aim of verifying the potentiality in the processing of tantalite containing compounds of rare earth elements (REEs), uranium and thorium (radioactivity level was below the background). The samples were prepared powdered and had, as initial composition, mainly: Ta2O5 (24.20)%, La2O3 (18.00%), CeO2 (6.30%), Nd2O3 (2.35%), Pr6O11 (1.99%), Y2O3 (1.57%), ThO2(0.11%) and U3O8(0.035%). They were processed in the microwave batch reactor (2.45GHz, 2kW). After the processing, the results of characterization by X-Ray Fluorescence (FRX), Scanning Electron Microscopy (SEM) and Energy-Disperse X-Ray Spectroscopy (EDS) showed that the content of the main compounds of REEs, besides Th and U were: La2O3 (9.38%), CeO2 (20.00%), Nd2O3 (6.29%), Pr6O11 (3.58%), Y2O3 (2.57%), ThO2(0.33%) and U3O8(0.036%). This occurred in the samples prepared with distilled water and irradiated with 15bar of H2. These preliminary tests were promising, but more experiments are needed, since many variables may still be explored and laboratory infrastructure is available for this purpose, at IPEN-CNEN/SP. As the demand for the use of REEs is rapidly increasing, due to the various applications (for example, as neutron moderators in nuclear reactors, special magnets, TV screens, cell phones and computers, catalysts, missiles, electric vehicles, wind and solar energy, among others), future studies would make it possible to add value and improve the quality of this ore. Finally, microwave technology could be used as an alternative for the reuse of these elements contained in mineral exploration residues.Artigo IPEN-doc 26275 Evaluation of microwave technology in the additional purification of Mo-99, produced from LEU targets2019 - 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.Resumo IPEN-doc 25424 Estudo da viabilidade de produção de biodiesel, a partir de óleos vegetais e catalisadores de resíduos de frutos do mar, em uma unidade reacional de hidrogenação em batelada, assistida por micro-ondas e aquecimento convencional2018 - ARAUJO, S.A. de; LANDINI, L.; SALVADOR, V.L.R.; SCAPIN, M.A.; MASSANARES, B.F.; URBANINHO, A.B.Neste trabalho a proposta foi a realização de estudo da viabilidade da produção de biodiesel, partir de resíduos de óleos vegetais de atividades domésticas, empregando resíduos de conchas (CaCO3), preparados na forma de óxido de cálcio (CaO) como catalisadores, em uma unidade de reação em batelada, em escala de bancada, instalada no IPEN-CNEN/SP. Ela é capaz de operar com alta pressão de gás hidrogênio (até 200bar) e alta temperatura (até 500°C), utilizando micro-ondas (2.450MHz, com até 2kW contínuo e 8kW pulsado) e aquecimento convencional (elétrico). Nos testes, foram avaliadas as carga de óleo (mL); tipo e massa de catalisador, com ou sem pressão de gás hidrogênio (bar); temperatura (°C); tempo de reação (h); potência de micro-ondas (W); velocidade de agitação da carga (rpm); aquecimento convencional (MC). As determinações analíticas das amostras foram feitas por meio de densidade, cromatografia em fase gasosa (GC), titulação potenciométrica e fluorescência de raios-X. Foram levantados dados, a fim de compará-los com outras metodologias já utilizadas em literatura. A proposta deste trabalho foi analisar a eficiência do uso destes tipos de catalisadores e óleos, na produção de biodiesel, como uma tecnologia alternativa.Resumo IPEN-doc 17615 Microwave energy applied to chloroprene rubber devulcanization2011 - SCAGLIUSI, SANDRA R.; ARAUJO, SUMAIR G. de; LANDINI, LILIANE; LUGAO, ADEMAR B.Resumo IPEN-doc 16308 Microwave energy applied to chloroprene rubber devulcanization2008 - SCAGLIUSI, S.R.; ARAUJO, S.G. de; LANDINI, L.; LUGAO, A.B.Resumo IPEN-doc 16299 Application of microwave heating to study the radioactive wate immobilization by using bitumen/rubber polymeric matrices2008 - CARATIN, R.L.; ARAUJO, S.G. de; LANDINI, L.; LUGAO, A.B.