Navegando por Autor "PINTO, Marcos Vinicios de Souza"

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Acesso aberto (Open Access)
Obtenção e caracterização de carvão ativado de caroço de buriti (Mauritia flexuosa L. f.) para a avaliação do processo de adsorção de cobre (II)
(Instituto Nacional de Pesquisas da Amazônia, 2013-03) PINTO, Marcos Vinicios de Souza; SILVA, Denilson Luz da; SARAIVA, Augusto Cesar Fonseca
In the Amazon region some industries discharges copper into watercourse that in high concentrations is toxic to the biota. The removal of copper from industrial effluent is performed by several processes such as adsorption. This work shows the result of copper (II) adsorption on activated carbon obtained from buriti kernel, carbonized at 400 °C and activated at 900 °C. The activated carbon was characterized according to specific area, pore size, apparent and real density, porosity, scanning electron microscopy, ash content, pH, moisture, fixed carbon and surface functional groups. The study of adsorption equilibrium evaluated the influence of the coal particles diameter, contact time adsorbent/adsorbate, pH and copper (II) solution initial concentration on copper (II) remotion. The results showed a higher removal efficiency of copper (II) to the diameter D < 0.595 mm, contact time of 300 minutes, pH of 4.01 and the copper (II) initial concentrations of 50 and 80 mg L-1. The mathematical model of Langmuir was the best fit to the adsorption equilibrium data. From the contact time of 15 minutes, all the equilibrium concentrations were below the allowed maximum of 1,0 mg L-1 provided by law for discharging effluents into receiving bodies.
Acesso aberto (Open Access)
Obtenção e caracterização de carvão ativado de caroço de buriti (Mauritia flexuosa L. f.) para avaliar o processo de adsorção de uma solução de Cu (II)
(Universidade Federal do Pará, 2013-09-30) PINTO, Marcos Vinicios de Souza; SILVA, Denilson Luz da; http://lattes.cnpq.br/4241759369873376
Buriti core carbon (CCB) was produced from the reject of artisanal production of its fruit for the extraction of oil, heated to 400ºC. Then, the CCB was activated at temperatures of 800ºC and 900ºC. Adsorption tests were performed to evaluate the discharge of these activation temperatures in the adsorption of a solution of copper (II) to a known initial concentration of 50 mg/L. After having examined the results, it was decided by the activation of coal to 900ºC. The activated carbon of the buriti core (CACB) to 900ºC was characterized according to commercial properties such as specific area, porosimetry, apparent and real densities, porosity of a bed fix, scanning electron microscopy, ash content, pH, moisture, fixed carbon and acid surface functional groups present in the CACB. The results showed a higher removal efficiency of copper (II) to the diameter D < 0.595 mm, for the contact time of 300 minutes, for the pH of 4.01 and the initial concentrations of copper (II) 50 and 80 mg/L. Mathematical models of Langmuir and Freundlich were applied to the data of adsorption equilibrium. The mathematical model of Langmuir was the best fit to the data of balance. The Langmuir’s mathematical model was the best fit to the data of balance. According to data from the kinetic equilibrium, it was observed that from the contact time of 15 minutes all the equilibrium concentrations were below the allowed maximum of 1,0 mg/L under the law CONAMA nº 357/2005 for release effluent into aqueous environments. The experimental results obtained are indicative that it is possible to remove copper (II) from industrial effluent using CACB activated physically at 900ºC for a period of 60 minutes.