https://ri.ufs.br/jspui/handle/riufs/135 Sun, 05 Apr 2026 19:42:36 GMT 2026-04-05T19:42:36Z https://ri.ufs.br/jspui/handle/riufs/24773 Título: Effect of the acid treatment of montmorillonite clay in the oleic acid esterification reaction Autor(es): Nascimento, Alexsandra Rodrigues do; Alves, José Antônio Barros Leal Reis; Reis, José Antônio Barros Leal; Mel, Dulce Maria de Araújo; Souza, Marcelo José Barros de; Pedrosa, Anne Michelle Garrido Thu, 01 Jan 2015 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/24773 2015-01-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/24706 Título: Simulación del proceso de biodegradación de aguas residuales de la industria de carne mediante una red neuronal artificial perceptrón multicapa Autor(es): Santana, José Carlos Curvelo; Araújo, Sidnei Alves de; Biazus, Joana Paula Menezes; Souza, Roberto Rodrigues de Abstract: In this paper, the use of a multilayer perceptron (MLP) artificial neural network (ANN) is proposed to simulate the variation of protein concentration according to the time and also to determine the end and optimal conditions of the biodegradation process of wastewater from meat industry. To reduce the protein concentration, papains from Carica papaya latex have been used at controlled condition of pH (5 and 7) and temperature (25 and 30 °C). Results showed that a reduction of 82 to 91% of protein concentration by the action of papains for 30 to 40 h of process time. Simulations showed that the best condition of the process occurred at pH 5, 30 °C and 35 h, in which a maximum biodegradation of 91% was obtained. Thu, 01 Jan 2015 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/24706 2015-01-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/24383 Título: Avaliação da potencialidade de argilas da formação geológica Calumbi e Riachuelo em Sergipe para aplicação em revestimento cerâmico Autor(es): Goes, José Resende; Azevedo, Thiago Figueiredo; Dutra, T. X. C.; Santos, V. B.; Severo Júnior, J. B.; Barreto, Ledjane Silva Abstract: Clays are the most important materials from the technological point of view, for the production of ceramic materials. Its chemical and mineralogical composition strongly influences the physical and chemical properties to be obtained in the finished product of ceramic. The aim of this paper was to evaluate the potential of clays of the Calumbi and Riachuelo geological formation in Sergipe, Brazil, for the application in ceramic tiles. Samples were collected from 03 clay deposits (“A”, “B” and “C”) and characterized by granulometryassays, plasticity, X-ray diffraction, and differential thermogravimetric analysis, infrared and X-ray fluorescence. The main identified phases were: quartz, kaolinite, illite, calcite and feldspar, and deposits “B” and “C” showed high levels of calcite. It was found that for ceramic processing conditions adopted in this paper, the properly mixed clay deposits of “A” and “B” are suitable for use in the processing industry ceramic tiles, particularly for obtaining of the classification of the absorption group “BIII”. Wed, 01 Jan 2014 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/24383 2014-01-01T00:00:00Z https://ri.ufs.br/jspui/handle/riufs/24194 Título: Redes metalorgânicas e suas aplicações em catálise Autor(es): Ramos, André Luis Dantas; Tanase, Stefania; Rothenberg, Gadi Abstract: Metal-organic frameworks (MOFs) form a new class of materials with well-defined yet tunable properties. These are crystalline, highly porous and exhibit strong metal-ligand interactions. Importantly, their physical and chemical properties, including pore size, pore structure, acidity, and magnetic and optical characteristics, can be tailored by choosing the appropriate ligands and metal precursors. Here we review the key aspects of synthesis and characterization of MOFs, focusing on lanthanide-based and vanadium-based materials. We also outline some of their applications in catalysis and materials science. Wed, 01 Jan 2014 00:00:00 GMT https://ri.ufs.br/jspui/handle/riufs/24194 2014-01-01T00:00:00Z