title: Conductive carbon-clay nanocomposites from petroleum oily sludge.
abstract: Oily sludge samples formed in water-oil separation tanks from a petroleum industry were collected, characterized and heat-treated at different temperatures, in order to yield carbon-clay composites. EDX microanalysis, XRD and FTIR data revealed that before carbonization the oily sludge was formed mainly by a mixture of quartz, montmorillonite, calcite, barite and oil residues. After carbonization, mineral phases present were mainly quartz, anorthite and gehlenite, in addition to graphitic and disordered carbon domains, according to XRD, Raman and TEM measurements. A preliminary evaluation of the electrical conductivity performed by Impedance Spectroscopy revealed that the composites formed are conductive, exhibiting conductivity values typical of semiconductors, in contrast to the precursor material.
authors.affiliation: Núcleo de Pós-graduação em Química, Universidade Federal de Sergipe-UFS, Av. Marechal Rondon s/n, São Cristóvão, SE, Brazil.
authors.forename: Patricia Fernanda
authors.initials: PF
authors.lastname: Andrade
authors.forename: Thiago Figueiredo
authors.initials: TF
authors.lastname: Azevedo
authors.forename: Iara F
authors.initials: IF
authors.lastname: Gimenez
authors.forename: Antonio Gomes
authors.initials: AG
authors.lastname: Souza Filho
authors.forename: Ledjane Silva
authors.initials: LS
authors.lastname: Barreto
mesh_terms: D000538:Aluminum Silicates; D002244:Carbon; D000077215:Clay; D004553:Electric Conductivity; D006358:Hot Temperature; D007220:Industrial Waste; D008903:Minerals / Q000032:analysis; D053761:Nanocomposites / Q000737:chemistry*; D010578:Petroleum; D012666:Semiconductors; D012722:Sewage / Q000737:chemistry*; D013057:Spectrum Analysis; D013696:Temperature
chemical_list: D000538:Aluminum Silicates; D007220:Industrial Waste; D008903:Minerals; D010578:Petroleum; D012722:Sewage; D002244:Carbon; D000077215:Clay