DAMARIS COSTA
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Resumo IPEN-doc 26950 The comparison of charcoal activation processes using methylene blue adsorption2017 - NUNES, R.M.; COSTA, D.; SOUZA, S.B.R. de; ORTIZ, N.A series of activation processes was performed on charcoal waste to absorb and remove methylene blue (MB) from polluted waters. The results were used to calculate the MB removal percentage and the surface coverage area. Both aspects are important indication of the activation process efficiency. The activated process with potassium chloride, potassium carbonate and water stream showed high adsorption efficiency with removal percentage of 90, 84 and 79% respectively and 24.5, 24.0 and 18.9 of m2 g-1 of surface cover area (θ) such surface area increment was considered an important aspect to evaluate the promising properties of activated charcoal to be use in water treatment plant.Resumo IPEN-doc 26949 Using charcoal micronized carbon (MEC) to methylene blue adsorption2017 - SOUZA, S.R.B.; COSTA, D.; NUNES, R.M.; ORTIZ, N.A comparison of different isotherm calculations was performed using micronized eucalyptus charcoal (MEC) absorbing methylene blue. The dye wastewater could affect in large scale the surface water quality and the metabolism of many species. The micronized charcoal was able to remove about 75% for the dye accordingly with Langmuir, Freundlich and Redlich-Peterson isotherm calculations suggesting a promising new, efficient and low cost water treatment process.Artigo IPEN-doc 24338 The use of eucalyptus activated biocarbon for water treatment-adsorption processes2017 - NUNES, ROBERTA M.; COSTA, DAMARIS; ORTIZ, NILCEA biocarbon after activation process showed the removal percentage of 92% of methylene blue in solution, the equilibrium parameter—RL value was in the interval from 0 to 1, with 46% of surface coverage degree. The Freundlich constant (n) was higher than 1 as an indication of the physical adsorption process. The Radlich-Peterson calculations obtained the higher R2 value which g constant near 1, a high similarity with Langmuir model. Temkin constant B1 was a positive indication of endothermic process. All calculations provided favorable results for the use of activated biocarbon for dye removing and possible for other organic substances.Resumo IPEN-doc 23271 The comparison of charcoal activation processes to improve methylene blue adsorption for water treatment2017 - NUNES, R.M.; COSTA, D.; SOUZA, S.B.R. de; ORTIZ, N.A series of charcoal activation processes was performed to absorb and remove methylene blue (MB) from synthetic solutions. The MB adsorption can also promote valuable measurements for charcoal activated processes evaluation. The higher activations efficiencies were obtained using potassium chloride, potassium carbonate and water stream. The activated charcoal removal percentages were 90, 88 and 79 % respectively, the surface coverage degree (Ɵ) 2.87, 5.72 and 6.04 % and surface area of 230.0, 145.0 and 121.9 (m2/mg).