https://repositorio.ufba.br/handle/ri/7160 2026-04-17T04:54:15Z https://repositorio.ufba.br/handle/ri/39992 Título: Revisão sobre a aplicação de microemulsões baseadas em óleos vegetais e estabilizadas com nanopartículas para recuperação avançada de petróleo. Autor(es): Santos, Verena Filgueiras Borges dos; Santos, Adriana Vieira dos; Rodrigues, Pamela Dias; Santos, Flávia Cristina Cerqueira dos; Simonelli, George; Santos, Luiz Carlos Lobato dos Abstract: Petroleum plays a crucial role in both the global economy and the energy sector. However, many oil wells are in advanced stages of exploration, leading to a decline in production. Some older fields have naturally exhausted their production capacity, while others can no longer extract sufficient oil through secondary recovery methods. In this context, enhanced recovery methods are being considered. Among these methods, the use of microemulsions has gained significant attention in recent years. The primary role of microemulsions in improving oil recovery is to reduce the interfacial tension between oil and water and to alter the rock's wettability, with the aim of extracting a greater amount of residual oil from the reservoir. However, the stability of microemulsions poses a challenge, especially under extreme conditions of temperature and salinity. Recently, nanoparticles have emerged as promising stabilizers for microemulsions, offering advantages such as resistance to adverse conditions, improved mobility control, and reduced surfactant consumption. This makes nanoparticle-stabilized microemulsions an attractive option for enhancing oil recovery and an integral part of the evolution of nanotechnology in various technological applications. This article reviews the use of this technology as a promising approach to optimize oil recovery efficiency. Editora / Evento / Instituição: Universidade Federal de Sergipe Tipo: Artigo de Evento 2024-06-13T00:00:00Z https://repositorio.ufba.br/handle/ri/38874 Título: Formulação de agente de limpeza ecologicamente correto visando a remediação de areia de praia Autor(es): Santos, Verena Filgueiras Borges dos; Santos, Adriana Vieira dos; Simonelli, George; Santos, Luiz Carlos Lobato dos Abstract: The spill, in 2019, on the northeastern coast of Brazil, spread oil on several beaches, causing a great environmental impact. An environmentally friendly cleaning agent was formulated based on a microemulsion composed of pine oil as the oily phase, surfactant from coconut oil, isopropyl alcohol as a cosurfactant and distilled water as the aqueous phase. This study proposes the application and evaluation of a microemulsion formulation (Winsor IV) to treat sand from beach impacted with oil. A pseudoternary phase diagram, C/T ratio = 10, was used to define the microemulsion area, and some combinations were selected for beach sand remediation. The proposed cleaning agent showed 23.48% contaminant removal efficiency and has potential in sand cleaning. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Artigo de Evento 2023-10-01T00:00:00Z https://repositorio.ufba.br/handle/ri/36250 Título: Distribution and sources of polycyclic aromatic hydrocarbons (PAHs) in surface sediments of a Tropical Bay influenced by anthropogenic activities (Todos os Santos Bay, BA, Brazil) Autor(es): Almeida, Marcos de; Nascimento, Danielle Vasconcelos do; Mafalda Junior, Paulo de Oliveira; Patire, Vinicius Faria; Barbosa, Ana Cecília Rizzatti de Albergaria Abstract: The present study aimed to evaluate the distribution and origin of 16 Priority PAHs in surficial sediment samples of Todos os Santos Bay (TSB, Brazil). Total PAHs concentrations ranged from below the method detection limit (< DL) to 533 ng g−1 (dry weight). The toxic equivalent concentrations (TEQcarc) of PAHs in the studied area ranged from 0 to 104 ng g−1 and were lower when compared to other contaminated bays in the world. Diagnostic ratios indicated that pyrogenic processes, such as pyrolysis of fossil fuel, biomass, and coal, were the main PAHs sources for sediments. Proximity of the sources, the hydrodynamics and geochemistry of the sediments were the factor influencing the distribution of PAHs along the studied area. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Artigo de Periódico 2018-10-17T00:00:00Z https://repositorio.ufba.br/handle/ri/36247 Título: Optimization of sample preparation procedures for evaluation of the mineral composition of fish feeds using ICP-based methods Autor(es): Souza, Sidnei de Oliveira; Pereira, Talita Reis dos Santos; Ávila, Dayara Virgínia Lino; Paixão, Luciane Brito da; Soares, Sarah Adriana Rocha; Queiroz, Antônio Fernando de Souza; Pessoa, Amália Geiza Gama; Korn, Maria das Graças Andrade; Maranhão, Tatiane de Andrade; Araújo, Rennan Geovanny Oliveira Abstract: Este trabalho descreve a aplicação de um desenho experimental na otimização da decomposição e do espectrómetro condições operacionais para a análise dos alimentos para peixes. O teor de 22 elementos (seis macroelementos, quatro microelementos e onze elementos de traço) nos alimentos para peixes (ornamentais e para consumo humano) foi determinado por métodos indutivamente acoplado ao plasma (ICP). Foram obtidos limites de quantificação e valores variaram entre 0,02 mg kg−1 (Cd) e 76 mg kg−1 (Al). A avaliação dos métodos foi conseguida através de análise de material de referência padrão, tecido ostra (NIST 1566b) e Chá (NCS DC 73351). As concentrações de elementos em amostras de alimentos para peixes ornamentais variaram entre < 0,02 mg kg−1 (Cd) e 2,79% (P) e para os peixes reprodução para consumo humano de < 0,02 mg kg−1 (Cd) a 2,00% (Ca). As concentrações dos elementos obtidos nos alimentos para peixes analisados estavam dentro dos limites estabelecidos pela legislação brasileira e americana para elementos regulados. Editora / Evento / Instituição: Universidade Federal da Bahia Tipo: Artigo de Periódico 2018-01-29T00:00:00Z