Navegando por Autor "Anjos, Marcelino José dos"
Agora exibindo 1 - 2 de 2
- Resultados por página
- Opções de Ordenação
Artigo Characterization of retorted shale for use in heavy metal removal(Elsevier, 2010-04) Melo, Marcus Antônio de Freitas; Pimentel, Patrícia Mendonça; Oliveira, Rosane Maria Pessoa Betânio; Melo, Dulce Maria de Araújo; Anjos, Marcelino José dos; González, GasparThere has been a growing interest in the use of cost-effective materials to remove heavy metals from wastewater. In this study, retorted shale, a solid residue of the thermal transformation of oil shale, was characterized with the objective of preparing heavy metal adsorbents. The fine residue was characterized using different techniques including thermogravimetric analyses, BET, FTIR, XRD, SEM, and TEM. Batch adsorption studies in wastewater were performed. The SRTXRF technique was used to determine element concentration. Removal was approximately 50–70% for Cr, Fe, Co, Ni, Cu, and Zn and > 90% for Hg and Pb. Thus, retorted shale can be used as an efficient adsorbent for heavy metal removal from wastewaterArtigo Multi-elemental analysis of produced water by synchrotron radiation total reflection X-ray fluorescence(Elsevier, 2008-02-15) Melo, Marcus Antônio de Freitas; Pimentel, Patrícia Mendonça; Anjos, Marcelino José dos; Melo, Dulce Maria de Araújo; Gonçalves Júnior, Lauro de Melo; Silva Júnior, Carlos Neco da; Lopes, R. T.he synchrotron radiation total reflection X-ray fluorescence (SRTXRF) technique was used for the analysis of heavy metals in produced watersamples from oil field in Rio Grande do Norte, in order to determine potential sources of pollution. Since the inorganic components in producedwater generally resembling sea water, pre-concentration procedures have been applied to increase the concentration of the analyte of interest andto minimize the salt matrix effects. This technique allows us to determine the contents of V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Hg and Pb in 20 producedwater samples. The great majority of the sampling points presented low elemental concentration value. However, in some sample, the Fe, Ni, Cu,Zn and Hg concentration were higher than the established limits by the Brazilian legislation