Engenharia Química

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http://repositorio.ufes.br/handle/10/17472
Programa de Pós-Graduação em Engenharia Química

Centro: CCAE
Telefone: (28) 3552 8719
URL do programa: http://www.engenhariaquimica.alegre.ufes.br/pos-graduacao/PPEQ

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Navegando Engenharia Química por Autor "Altoe, Mario Alberto Simonato"

Agora exibindo 1 - 4 de 4
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    Adsorção de sulfato por compósito de hidróxido duplo lamelar do tipo Mg6Al2(CO3)(OH)16.4H2O e quitosana
    (Universidade Federal do Espírito Santo, 2022-08-18) Pessanha, Maria Luiza Gomes Soares; Guimarães, Damaris; https://orcid.org/0000000249323252; http://lattes.cnpq.br/6576377621734943; Altoe, Mario Alberto Simonato; http://lattes.cnpq.br/8481776828705621; Profeti, Demetrius; https://orcid.org/0000000345653331; http://lattes.cnpq.br/5030262115789096
    The sulfate is a common ion present in several wastewater industrial segments and domestic wastewater. The high concentration of sulfate ion could cause several types of damage, like laxative effect on humans and animals, and is related to incrustation and corrosion of industrial pipes. For the treatment of these effluents, the adsorption technique stands out for the variety of adsorbents. In this work, the SO4 2- adsorption process by the LDH-Mg-Al-CO3 and chitosan composite was carried out. The chitosan was synthesized from shrimp residues from the region, and the composite was synthesized by the co-precipitation method, common in the LDH synthesis. The DD% was determinated for chitosan, obtaining the value of 54,47% which confirms that the material obtained from the deacetylation of chitin can be considered chitosan. The characterization of adsorbents was carried out through the XDR, SEM-EDS and FTIR techniques, showing that the material has characteristic peaks and morphological aspects of LDH-Mg-Al-CO3 and chitosan before and after adsorption, indicating there was no change in the structure of the material. The kinetic test showed the SO4 2- loading by the LDH-Mg-Al-CO3 and chitosan composite was 234,15 mg g-1, and the equilibrium time was reached in 180 minutes. Applying kinetic models to the data, pseudo-first order (R² = 0,93) and pseudo-second order (R² = 0,91) resulted in similar values, and it was not possible to conclude which of them best fitted the kinetic data. With the isotherm study, it was observed the Redlich-Peterson model (R²= 0,96, β=0,84) was the best model adjusted to data, assuming behavior of the Langmuir isotherm with monolayer adsorption, because the β parameter is closer to 1. In view of the results obtained throughout the study, it was possible to observe that there was a synergy between LDH-Mg-Al-CO3 and chitosan in the composite, which resulted in better loading results of SO4 2- adsorption, in relation to the precursor adsorbents.
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    Avaliação da adsorção da etilenotioureia utilizando esmectita Cu(II) como adsorvente
    (Universidade Federal do Espírito Santo, 2019-02-22) Bazzarella, Andréia Zacchi; Profeti, Demetrius; Profeti, Luciene Paula Roberto; Neves, Mirna Aparecida; Altoe, Mario Alberto Simonato
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    Remoção de íons sulfato aplicando a hidrocalumita calcinada como agente precipitante
    (Universidade Federal do Espírito Santo, 2020-08-25) Santana, Dantara Freires; Guimaraes, Damaris; https://orcid.org/0000000249323252; http://lattes.cnpq.br/6576377621734943; https://orcid.org/0000000314364553; http://lattes.cnpq.br/; Altoe, Mario Alberto Simonato; https://orcid.org/; http://lattes.cnpq.br/8481776828705621; Profeti, Luciene Paula Roberto; https://orcid.org/; http://lattes.cnpq.br/6517975282316378
    The hydrocalumite (Ca2Al(OH)6Cl.2H2O), a layered double hydroxide (LDH), was synthesized and calcined at different temperatures in order to evaluate its application as a precipitating agent in the sulfate removal. For the characterization of the used mate
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    Síntese de um compósito empregando resíduo do processamento de quartzito e quitosana e sua utilização na adsorção do corante reativo preto 5
    (Universidade Federal do Espírito Santo, 2020-02-20) Coura, Jean Cota; Profeti, Luciene Paula Roberto; https://orcid.org/0000-0001-6280-2410; http://lattes.cnpq.br/6517975282316378; https://orcid.org/0000-0001-8652-6705; http://lattes.cnpq.br/2291025928996444; Guimaraes, Damaris; https://orcid.org/0000000249323252; http://lattes.cnpq.br/6576377621734943; Altoe, Mario Alberto Simonato; https://orcid.org/; http://lattes.cnpq.br/8481776828705621; Profeti, Demetrius; https://orcid.org/0000000345653331; http://lattes.cnpq.br/5030262115789096
    The ornamental rocks extraction and the culture of shrimps are activities that perform an important role in the Brazil economy. However, the ornamental rocks manufacturing, as well as the cleaning of shrimps yield a great quantity of solid wastes that damage the environment when inappropriately discarded. Another environmental problem is the release of effluent containing dye, such as Reactive Black 5 (RB 5), causing the contamination and eutrophication of water. Among the methods of wastewater treatment, the adsorption is highlighted due to its efficiency and operational simplicity. Nevertheless, this method becomes feasible economically only when low- cost alternative adsorbent materials are used. Thus, the aim of this study was synthesizing a composite formed by chitosan extracted from shrimp husks dispersed on the quartzite powder, which is a residue from the ornamental stone processing. This adsorbent material was applied in adsorption of Reactive Black 5 dye. The composite was characterized by Fourier transformed infrared (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The adsorption kinetics, adsorption equilibrium and adsorption thermodynamics of RB 5 onto quartzite/chitosan composite were investigated. The main functional groups of chitin and chitosan were found in FTIR analysis attesting the success of the synthesis. The SEM micrographs showed that the composite has a rough surface with high porosity and heterogeneity. The active sites in the surface was filled after adsorption of dye. The elemental analysis by EDS indicated the predominance of Si, O, and C in the composite. The XRD analysis assigned that the quartz is the main crystalline phase of the composite, and a small diffraction peak could be attributed to the presence of chitosan. This specie was also confirmed by TGA. The adsorption kinetics data were better fitted to the pseudo- second-order model, indicating that chemical interactions occur between adsorbent and adsorbate. The Sips and Liu isotherm models described the adsorption equilibrium. The maximum capacity of removal was found as 171.50 mg/g, at 55 °C. The thermodynamic studies showed that the adsorption of RB 5 onto quartzite/chitosan composite is an endothermic process with higher spontaneity as the temperature increases. Thus, the composite synthesized in this study is a sustainable and effective adsorbent for RP 5 removal of aqueous solutions, presenting potential to be used, also, in the decontamination of effluents containing such pollutant.