SABINE NEUSATZ GUILHEN

SABINE NEUSATZ GUILHEN

(Fonte: Lattes)

Resumo

Possui graduação em Química com atribuições Tecnológicas e Biotecnológicas pelo Instituto de Química da Universidade de São Paulo (2005), mestrado (2009) e doutorado (2018) em Tecnologia Nuclear (Materiais) pelo Instituto de Pesquisas Energéticas e Nucleares (IPEN), Universidade de São Paulo. Tem experiência em Química Analítica com ênfase em Análise de Traços, atuando principalmente no desenvolvimento de métodos analíticos empregando técnicas espectrofotométricas (AAS, ICP OES e ICP-MS) para caracterização de amostras ambientais, arqueológicas, biológicas, forenses e nucleares. Atualmente, ocupa o cargo de Tecnologista em "Caracterização Química" no Centro de Química e Meio Ambiente (CQMA) do IPEN (CNEN/SP), onde desempenha atividades de pesquisa e desenvolvimento tecnológico em atendimento às demandas institucionais ligadas ao Ciclo do Combustível Nuclear e aos Programas de Pesquisa de caráter multidisciplinar, em apoio a projetos de Inovação Tecnológica e ao Programa de Pós-Graduação do IPEN/USP. Além disso, atua na geração de produtos tecnológicos e no desenvolvimento de materiais adsorventes de baixo custo e alto valor agregado visando o aproveitamento de materiais e resíduos naturais e/ou renováveis no tratamento de efluentes e rejeitos. (Texto extraído do Currículo Lattes em 4 maio 2023)

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Physical and chemical characteristics of feed coal and its by-products from a Brazilian thermoelectric power plant
2019 - IZIDORO, JULIANA de C.; MIRANDA, CAIO; CASTANHO, DAVI; ROSSATI, CARLOS; CAMPELLO, FELIPE; GUILHEN, SABINE N.; FUNGARO, DENISE A.; WANG, SHAOBIN
In this study, feed coal (FC) from the Figueira Thermoelectric Power Plant (FTPP), located in the state of Paraná (PR), Brazil was characterized by X-ray fluorescence (XRF), X-ray diffractometry (XRD), infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), particle size distribution analysis by laser diffraction, loss of ignition (LOI), total carbon content (TC), pH and conductivity. FC-derived by-products (CCBs) collected at the FTPP were: bottom ash (BA), fly ash from cyclone filter (CA) and fly ash from bag filter (FA). In addition to the techniques used for feed coal characterization, CCBs were also characterized by total surface area (by using BET method), external surface area (by using laser diffraction), cation exchange capacity (CEC), bulk density, besides leaching and solubilization tests. FC sample contains 72.2% of volatile material, of which 55.3% is total carbon content. LOI, FTIR, TGA and TC analyzes corroborated with these results. The main crystalline phases in the FC sample were found to be quartz, kaolinite and pyrite. The elements As, Cr, Ni and Pb were encountered in the FC sample, indicating that the use of FTPP feed coal should be monitored due to the toxic potential of these elements. The three coal ashes were classified as class F according to ASTM and presented similar chemical composition, with total content of the main oxides (SiO2, Al2O3 and Fe2O3) above 72%. Ashes enrichment factor analysis (EF) showed that As, Zn and Pb concentrate mainly in fly ash from bag filter (FA), whereas the elements K and Mg presented higher enrichment in the bottom ash (BA) . All ashes presented quartz, mullite and magnetite as crystalline phases, as well as the same functional groups, related to the presence of humidity, organic matter and Si and Al compounds. XRD, XRF, TGA, FTIR, LOI and TC techniques were correlated and confirmed the obtained results. Total and external surface area values of CCBs were related to the total carbon content (TC), as well as to the results of particle size distribution and the scanning electron micrographs of the samples. On the other hand the CEC of the ashes showed relation with the particle size distribution and with the external surface area. Leaching and solubilization tests of CCBs showed that FA sample was considered hazardous and classified as class I waste, while CA and BA samples were considered non-hazardous and non-inert wastes and classified as class II-A. FA sample from Figueira power plant must be discarded only after treatment or a stringent disposal criterion must be followed to avoid contamination on site. In this work, feed coal sample was also compared to the CCBs samples generated from it. The results showed the differences between fuel and products through the different characterization techniques. In addition to contributing to the understanding of the relationship between coal and its combustion products, this work can also help to reduce the environmental impacts caused by the CCBs disposal, as well as can also be used to compare the characteristics of CCBs from FTPP with the new wastes that will be generated by the same thermal power plant that will be soon modernized.
Application of high-purity zeolite a synthesized from different coal combustion by-products in carbon dioxide capture
2019 - IZIDORO, JULIANA; CASTANHO, DAVI; ROSSATI, CARLOS; FUNGARO, DENISE; GUILHEN, SABINE; NOGUEIRA, THIAGO; ANDRADE, MARIA de F.
High-purity zeolites A were synthesized from different coal combustion by-products (baghouse filter fly ash, cyclone filter ash, and bottom ash) and characterized in terms of morphology, chemical, and mineralogical composition. The products were tested for carbon dioxide capture by using a continuous CO2 flow system passing through a column packed with the adsorbent material, which was connected to an analyser that directly measures the concentration of CO2. The values of CO2 adsorption capacities calculated for the unmodified Na-A zeolites (ZABF, ZACF, and ZABA) were 556.48, 494.29 and 654.82 mg g–1, respectively. These values were higher than those achieved by the calcium-modified zeolite samples. ZABA adsorbent presented the best performance in CO2 capture when compared to the other adsorbent material and achieved an adsorption capacity 32% higher than a 4A commercial zeolite. In the adsorption cycles study, the percentage of CO2 desorption by ZABA at the second and third cycles reached 93%, showing that zeolite A can be regenerated by heating at 150 ºC. The use of coal ashes to obtain zeolites and the application of these products for the CO2 adsorption can be an important strategy to mitigate both the problem of waste management and the greenhouse gases emission in coal-fired power plants.
Synthesis of nanocrystalline zeolite Na-A from coal fly ash and different aluminum sources
2018 - FUNGARO, DENISE A.; IZIDORO, JULIANA C.; GUILHEN, SABINE N.; SILVA, KATIA C.; WANG, SHAOBIN
This chapter describes the synthesis process to obtain zeolite Na-A from coal fly ash via fusion with NaOH followed by hydrothermal reaction. Coal fly ash is a low cost source of both silica and alumina. The molar ratio of SiO2/Al2O3 for zeolite 4A formation was achieved by the addition of sodium aluminate solution or aluminum waste from tertiary industry as aluminum sources. The effects of temperature and time at the fusion step and the hydrothermal reaction time on crystalline products were investigated. The synthesized products were studied for their purity and yield as well as were characterized by different techniques such as Xray powder diffraction (XRD), scanning electron microscopy (SEM) and cation exchange capacity (CEC), among others. Analysis of the properties of the raw materials and the products demonstrates that the by-products can be used to produce a high purity zeolite A. The optimum conditions related to the synthesis was set and the samples were pure, highly crystalline and white. The synthesized zeolites were used for both the removal of Cd (II) and Zn (II) from aqueous solution. The results showed that coal fly ash and aluminum source can be transformed into zeolite A, which is considered as value-added material with adsorption properties.
Immobilization agents study of toxic elements in coal ash
2018 - IZIDORO, JULIANA; FUNGARO, DENISE; CAMPELLO, FELIPE; GUILHEN, SABINE
Metal leaching from coal fly ashes into the environment is of a much concern. A series of batch tests were performed to investigate the potential leaching of metals from fly ash modified with organosilane (OS) and quaternary ammonium surfactant (SF). The fly ash was collected at the Figueira Thermal Power Plant, located in the city of Figueira, State of Paraná. Firstly, the influence of ash mass/water volume ratio on the concentration of the elements in the leachates from untreated fly ash was evaluated. Subsequently, the capacities of immobilization of toxic elements by the different immobilizing agents were determined by measuring the pH and conductivity of the leachates from the treated fly ash. A significant reduction in the concentration of the elements was observed for all the leachate samples obtained from the ashes treated with OS. The concentrations were reduced by 89%, 77%, 42% and 11% for Cr, Mo, As and Se, respectively. When SF was used for the ash treatment, the concentration reduction in the leachates was found to be above 60% for all elements. These results show that both the OS and SF can be used as immobilizing agents for the retention of toxic elements presented in coal ashes.
Chemical, mineralogical and environmental characterization of combustion byproducts generated from mineral coal used for electricity production
2017 - IZIDORO, JULIANA de C.; MIRANDA, CAIO da S.; GUILHEN, SABINE N.; FUNGARO, DENISE A.
The coal combustion by-products, bottom ash (BA), fly ash from cyclone filter (CA) and fly ash from bag filter (FA), generated in a Brazilian thermoelectric power plant, were characterized by Xray fluorescence, X-ray diffractometry and leaching and solubilization tests. The material retention systems used in the Brazilian power plant from where these by-produtcts were sampled are showed in Figure 1. The three types of coal ashes presented similar chemical composition, with a total content of main oxides (SiO2, Al2O3 and Fe2O3) above 72% and were classified as class F (according to ASTM). The analysis of ash enrichment factor showed that arsenic, zinc and lead concentrate mainly on FA, whereas the elements that presented the greatest enrichment in the bottom ash (BA) and therefore present low volatility are K and Mg. All ashes presented quartz, mullite and magnetite as crystalline phases. In the leaching and solubilization study, the FA sample was considered hazardous and classified according to Brazilian regulation as Class I solid waste, whereas CA and BA samples were considered non-hazardous and not inert solid wastes and classified as Class II-A. Therefore, FA sample from this Brazilian power plant must be discarded only after treatment or stringent disposal criteria must be followed to avoid contamination on site.
Removal of cadmium and zinc from aqueous solutions using zeolite synthesized from coal fly ash and industrial aluminium waste
2018 - SILVA, K.C.; GUILHEN, S.N.; IZIDORO, J.C.; FUNGARO, D.A.
Coal fly ash can be used as a source of Silicon and Aluminum for 4A zeolite synthesis. It is necessary to consider the adequate proportion of Si / Al for the synthesis, so the aluminum waste from tertiary industry was used as an alternative and sustainable aluminum source. The synthesis was carried out by alkaline fusion followed by the hydrothermal treatment obtaining sodium aluminosilicate, which was then crystallized in NaOH solution. The samples were characterized by XRF, XRD and cation exchange capacity. The zeolite produced has the capacity to adsorb the Cd (II) and Zn (II) ions from aqueous solutions. The maximum adsorption capacity was 78.0 and 35.8 mg.g-1 for the Cd and Zn, respectively. The results showed that the aluminum waste and the fly ash together can be transformed into zeolite A, considered as value-added material and with promising adsorption properties.
Treatment of coal ash landfill leachate using zeolitic materials from coal combustion by-products
2018 - IZIDORO, JULIANA de C.; MIRANDA, CAIO da S.; GUILHEN, SABINE N.; FUNGARO, DENISE A.; WANG, SHAOBIN
Three different zeolitic materials derived from coal combustion by-products (CCBs) were used to treat local coal ash landfill leachate at the same power plant. The zeolitic materials properties were characterized in terms of mineralogical composition (XRD), chemical composition (XRF), total carbon content, morphological analysis (SEM), specific surface area (BET method), cation exchange capacity (CEC), loss of ignition, pH, conductivity and bulk density. XRD indicated that sodalite zeolite was formed in all the samples after hydrothermal activation of CCBs. One zeolitic product from baghouse fly ash (ZFB) presented the lowest SiO2/Al2O3 ratio, highest CEC and specific surface area, thus having a high capacity in removal of heavy metal pollutants. The zeolitic products were efficient to reduce arsenic concentration to a value below the legislation. All zeolitic materials also showed a significant removal of Ni, Cd, Zn and Co except of Cr at a dose of 10 g L-1. Thus, this work provides a sustainable strategy to resolution of solid waste from power plants.
Estudo da imobilização de elementos tóxicos presentes nas cinzas de carvão por meio do tratamento com agentes imobilizadores
2017 - CAMPELLO, F.A.; IZIDORO, J.C.; GHILHEN, S.N.; FUNGARO, D.A.
A capacidade de imobilização de elementos tóxicos presentes nas cinzas de carvão usando orgânosilano (OS) e surfactante (SF) como agentes imobilizadores foi determinada por experimentos em batelada. As cinzas de carvão utilizadas no estudo foram coletadas na Usina Termelétrica de Figueira, localizada na cidade de Figueira, Estado do Paraná. Primeiramente, a influência da relação massa de cinzas/volume de água na concentração dos elementos nos lixiviados foi avaliada. Posteriormente, as capacidades de imobilização de elementos tóxicos usando os diferentes agentes imobilizadores, o pH e a condutividade dos lixiviados foram determinados. Observou-se uma significativa redução da concentração dos elementos para todas as amostras de lixiviados das cinzas tratadas com OS. As reduções de concentração usando OS foram de 89%, 77%, 42% e 11% para Cr, Mo, As e Se, respectivamente. No ensaio das cinzas tratadas com SF, a redução de concentração nos lixiviados estava acima de 60% para todos os elementos. Esses resultados mostram que tanto o orgânosilano, como o surfactante podem ser usados como agentes imobilizadores para retenção de elementos tóxicos presentes nas cinzas de carvão.
Avaliação da remoção de elementos metálicos tóxicos presentes no efluente do aterro de cinzas de carvão mineral usando zeólita sintética
2017 - MIRANDA, CAIO da S.; IZIDORO, JULIANA de C.; GUILHEN, SABINE N.; FUNGARO, DENISE A.
A produção de energia elétrica usando carvão mineral gera diferentes tipos de resíduos que precisam ser dispostos adequadamente para não causar impactos ambientais significativos. Diversas técnicas têm sido adotadas para que haja a redução da lixiviação dos elementos metálicos tóxicos presentes nas cinzas. O preparo do aterro de cinzas usando camadas de calcário e argila foi usado como alternativa por uma usina termelétrica a carvão localizada na região sul do Brasil. A utilização das cinzas leves para a síntese de materiais de valor agregado, por outro lado, também pode amenizar esse problema pelo fato de reduzir a quantidade de resíduo a ser disposto. O objetivo do presente trabalho foi avaliar a remoção de elementos tóxicos presentes no efluente de um aterro de cinzas usando zeólitas sintetizadas a partir dos próprios resíduos de combustão do carvão. Os ensaios foram realizados em batelada empregando-se 10 g de zeólita/L e 20 g de zeólita/L. A comparação entre as concentrações dos elementos do efluente antes e após o contato com a zeólita, bem como as análises de pH e condutividade foram realizadas. Os resultados indicaram que cromo e arsênio foram os principais elementos tóxicos presentes no efluente do aterro de cinzas que apresentavam concentração acima do permitido pela legislação ambiental. Após o tratamento com a zeólita, a concentração de arsênio no efluente reduziu de 1,09 mg/L para 0,275 mg/L na dose de 10 g/L e ficou abaixo do limite de detecção do equipamento (< 0,01) na dose de 20 g/L. Para o cromo, não houve alteração da concentração, enquanto uma elevação dos valores de pH e condutividade do efluente foi observada. O presente estudo sugere que a zeólita de cinzas leves de carvão podem ser usadas como forma de tratamento de efluentes contendo elevados níveis de arsênio.