SABINE NEUSATZ GUILHEN

Resumo

Possui graduaĆ§Ć£o em QuĆ­mica com atribuiƧƵes TecnolĆ³gicas e BiotecnolĆ³gicas pelo Instituto de QuĆ­mica da Universidade de SĆ£o Paulo (2005), mestrado (2009) e doutorado (2018) em Tecnologia Nuclear (Materiais) pelo Instituto de Pesquisas EnergĆ©ticas e Nucleares (IPEN), Universidade de SĆ£o Paulo. Tem experiĆŖncia em QuĆ­mica AnalĆ­tica com ĆŖnfase em AnĆ”lise de TraƧos, atuando principalmente no desenvolvimento de mĆ©todos analĆ­ticos empregando tĆ©cnicas espectrofotomĆ©tricas (AAS, ICP OES e ICP-MS) para caracterizaĆ§Ć£o de amostras ambientais, arqueolĆ³gicas, biolĆ³gicas, forenses e nucleares. Atualmente, ocupa o cargo de Tecnologista em "CaracterizaĆ§Ć£o QuĆ­mica" no Centro de QuĆ­mica e Meio Ambiente (CQMA) do IPEN (CNEN/SP), onde desempenha atividades de pesquisa e desenvolvimento tecnolĆ³gico em atendimento Ć s demandas institucionais ligadas ao Ciclo do CombustĆ­vel Nuclear e aos Programas de Pesquisa de carĆ”ter multidisciplinar, em apoio a projetos de InovaĆ§Ć£o TecnolĆ³gica e ao Programa de PĆ³s-GraduaĆ§Ć£o do IPEN/USP. AlĆ©m disso, atua na geraĆ§Ć£o de produtos tecnolĆ³gicos e no desenvolvimento de materiais adsorventes de baixo custo e alto valor agregado visando o aproveitamento de materiais e resĆ­duos naturais e/ou renovĆ”veis no tratamento de efluentes e rejeitos. (Texto extraĆ­do do CurrĆ­culo Lattes em 4 maio 2023)

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Resultados de Busca

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  • Artigo IPEN-doc 25729
    Kinetic study of uranium removal from aqueous solutions by macaĆŗba biochar
    2019 - GUILHEN, SABINE N.; ROVANI, SUZIMARA; PITOL FILHO, LUIZILDO; FUNGARO, DENISE A.
    MacaĆŗba (Acronomia aculeata) is a palm tree native of the Brazilian savanna and a valuable renewable source of vegetable oil for human consumption and biodiesel production. In this study, the potentiality of the macaĆŗba endocarp for biochar (BC) production was demonstrated. Moisture, density, elemental and molecular composition, along with TGA, FTIR, and XRD analyses were performed for the endocarp. Adsorption of uranyl ions, U(VI), from aqueous solutions was studied by batch technique using BC produced by slow pyrolysis of the endocarp at 350 Ā°C (BC350). The effect of contact time on the removal of U(VI) by BC350 was evaluated. Linear and non-linear kinetics models were employed and the best fit for the experimental data was achieved for pseudo-first order non-linear model. The adsorption equilibrium was attained after 180 min of contact time and the equilibrium adsorption capacity achieved was of 400mg g-1. Finally, BC350 was characterized by SEM, FTIR, WDXRF, and XRD techniques.
  • Artigo IPEN-doc 22635
    Evaluation of europium-doped HA/'beta'TCP ratio fluorescence in biphasic calcium phosphate nanocomposites controlled by the pH value during
    2016 - SILVA, FLAVIA R.O.; LIMA, NELSON B.; GUILHEN, SABINE N.; COURROL, LILIA C.; BRESSIANI, ANA H.A.
    Europium-doped hydroxyapatite (HA), beta-tricalcium phosphate (Ī²-TCP) and biphasic phosphate nanopowders were synthesized by co-precipitation method and their crystal structures and fluorescence properties were investigated depending on the pH of the starting solution. In the range of pH 6ā€“10, HA and Ī²-TCP phases coexist. The Ī²-TCP proportion increased as the pH of the solution decreased, while HA yields decreased. At pH below 6, monophasic Ī²-TCP powder was obtained after thermal treatment. In particular, HA and Ī²-TCP can be used as luminescent materials when activated by Eu3Ć¾ ions in substitution of Ca2Ć¾ ions. Herein, the Eu3Ć¾ ions doped HA and Ī²-TCP phase composition were analyzed in order to investigate the fluorescence emission of the HA, Ī²-TCP and biphasic compounds. Eu-doped HA exhibited a red-orange emission at 575 nm with several minor peaks at 610ā€“640 nm, while Eu-doped Ī²- TCP had an unexpected strong red emission at 610ā€“620 nm and a secondary band at 590ā€“600 nm. In fact, the Eu:Ī²-TCP integrated emission area is almost 20-fold higher than Eu:HA for the same europium ion concentration. These results demonstrate the potential of Eu:Ī²-TCP as biomarker for medical applications, as drug release and targeting based on their luminescent properties