Navegando por Autor "Moura, M. C. P. A."
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Artigo Development of asphalt emulsions incorporating waste lubricating oil(Associação Brasileira de Petróleo e Gás, 2015) Brito, P. K. S.; Carvalho, D. F.; Moura, M. C. P. A.; Barros Neto, Eduardo Lins; Dantas, Tereza Neuma de Castro; Dantas Neto, Afonso AvelinoThe aim of this study is to develop asphalt emulsions incorporating used lubricating oil (OLUC), as a modifier agent, to produce stable emulsions and resulting in cost-effective and environmentally friendly product suitable for paving applications. A central composite design (CCD) is proposed to reduce the experiment’s number. The asphalt emulsions were characterized by Saybolt Furol viscosity, residue by evaporation, settlement and storage stability, sieve test, ductility, and penetration over residue. The results showed that asphalt emulsions, in accordance with all technical specifications, can be produced at 80°C, using 5 minutes as emulsification time and low amounts of surfactant. Moreover, the experiment incorporated OLUC in the composition of asphalt emulsions to obtain new low-cost products for use in paving operationsArtigo Removal of Reactive Blue 19 using nonionic surfactant in cloud point extraction(ELSEVIER, 2014-12-10) Melo, Ricardo Paulo Fonseca; Barros Neto, Eduardo Lins de; Dantas, Tereza Neuma de Castro; Dantas Neto, Afonso Avelino; Moura, M. C. P. A.; Oliveira, Humberto Neves Maia deTextile wastewater represents a serious environmental issue due to the presence of toxic dyes. The cloudpoint extraction, which involves the application of nonionic surfactants at temperatures above the cloudpoint, was applied in this research to remove Reactive Blue 19 dye from a synthetic wastewater. Nonyl-phenol with 9.5 ethoxylation degree was used as nonionic surfactant. Dye removal was evaluated consid-ering the influence of surfactant concentration, temperature, and initial dye concentration. Equilibriumdata followed the Langmuir isotherm model. Negative Gibbs energy, enthalpy, and entropy showed thatthe process was spontaneous and exothermal. Dye removal reached 91% when using 7.5 wt% surfactant,at 65.0°C. Cloud point extraction can be used as an efficient alternative for treating textile wastewatercontaining Reactive Blue 19