Navegando por Autor "SANTOS, Davis Castro dos"

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Acesso aberto (Open Access)
Application of carbon composite adsorbents prepared from coffee waste and clay for the removal of reactive dyes from aqueous solutions
(2015-05) SANTOS, Davis Castro dos; ADEBAYO, Matthew Ayorinde; LIMA, Éder Cláudio; PEREIRA, Simone de Fátima Pinheiro; CATALUÑA VESES, Renato; SAUCIER, Caroline; THUE, Pascal Silas; MACHADO, Fernando Machado
A novel carbon composite was prepared from a mixture of coffee waste and clay with inorganic:organic ratio of 1.3 (CC-1.3). The mixture was pyrolysed at 700 °C. Considering the application of this adsorbent for removal of anionic dyes, the CC-1.3 was treated with a 6 mol L-1 HCl for 24 h to obtain ACC-1.3. Fourier transform infrared (FTIR), N2 adsorption/desorption curves, scanning electron microscope (SEM) and powder X-ray diffractometry (XRD) were used for characterisation of CC-1.3 and ACC-1.3 carbon adsorbents. The adsorbents were effectively utilised for removal of reactive blue 19 (RB-19) and reactive violet 5 (RV-5) textile dyes from aqueous solutions. The maximum amounts of RB-19 dye adsorbed at 25 °C are 63.59 (CC-1.3) and 110.6 mg g-1 (ACC-1.3), and 54.34 (CC-1.3) and 94.32 mg g-1 (ACC-1.3) for RV-5 dye. Four simulated dye-house effluents were used to test the application of the adsorbents for treatment of effluents.
Acesso aberto (Open Access)
O ensino da matemática na educação de jovens e adultos em uma escola pública de Altamira (PA)
(Universidade Federal de Itajubá, 2020) FEITOSA, Samara Mendes; FORMIGOSA, Marcos Marques; CORDEIRO, Leonardo Zenha; SANTOS, Davis Castro dos
This article is the result of a research that had as its general objective to analyze how the methodologies in mathematics teaching reflect on the teaching and learning process of the students of EJA. The place chosen for the research was a public school located in the city of Altamira (PA). Initially we conducted a bibliographic research and, later, a field research, with a questionnaire applied to two teachers who teach Mathematics, where the data were analyzed from a qualitative perspective. It is noticed that the teaching of mathematics in the EJA needs reformulations of the most diverse, starting with the didactic material and the qualification of the teachers, so that there are different methodologies for the teaching of mathematics directed to this public.