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Silicon dioxide extraction from cashew nut ashes
Martins, Felipe Mota; Alencar, Francisco Klayton Marques de; Freire, Francisco Nivaldo Aguiar; Sena, Aline Cosmo de; Rocha, Hélio Henrique BarbosaAfter the cashew nuts processing, the husks rich in silicon are used as fuel in boilers where they are burned at temperatures above 1000 °C. In this study, it was investigated a form of silicon extraction from the ashes taken from the boiler using a chemical route. At first, the ashes were bathed with an aqua regia solution (+ 3), then it were bathed with sulfuric acid (4) and taken to the oven at 600 °C for tw...
Photoelectrodes with titanate nanotubes sensitized by mesoporphyrin derivative ...
Souza, Antonio Paulo Santos; Almeida, Ana Fabíola Leite; Conegero, Leila de Souza; Viana, Bartolomeu Cruz; Ferreira, Odair PastorTitanate nanotubes (TiNTs) with the chemical composition Na2Ti3O7.nH2O (NaTiNT) were obtained through a hydrothermal method in highly alkaline medium. Protonated titanates nanotubes (H-TiNTs), with the composition H2Ti3O7.nH2O, were prepared by ion exchange reaction through a suspension of Na2Ti3O7nH2O nanotubes in HCl medium, promoting the exchange of Na+ ions by H+. Both Na2Ti3O7.nH2O and H2Ti3O7.nH2O produc...
Qualidade de águas subterrâneas em área do sertão central do Ceará com base em ...
Alencar, Francisco Klayton Marques deWater resources are strategic elements for the development of societies, their use and management must be done effectively and efficiently, mainly in semiarid regions, which present natural conditions unfavorable to access to water. It is common in these regions to increasingly exploit groundwater, however, their rampant use represents threat in quantitative and qualitative terms to aquifers. Salinization of wa...