Araceli A Seolatto
@ufg.br
Instituto de Química
Universidade Federal de Goiás
Possui graduação em Engenharia Química pela Universidade Estadual do Oeste do Paraná (2003), mestrado (2005) e doutorado (2008) em Engenharia Química pela Universidade Estadual de Maringá. Tem experiência na área de Tecnologia Ambiental, com ênfase em desenvolvimento de processos, atuando principalmente nos seguintes temas: produção de bioetanol por meio de biomassas, tratamentos de efluentes líquidos, remoção de poluentes utilizando adsorventes alternativos. É professora nível Associado 2 do Instituto de Química da Universidade Federal de Goiás.
Scopus Publications
Scopus Publications
Fabíola Melazo Amorim Silva Costa, Araceli Aparecida Seolatto, Rodrigo Silva Fontoura, and Fernanda Ferreira Freitas
Informa UK Limited
Rowander A Moura, Araceli A Seolatto, Maria E de Oliveira Ferreira, and Fernanda F Freitas
Hindawi Limited
In this study, the potential of bone char for Royal Blue Tiafix and Black Tiassolan dyes adsorption from aqueous solutions was evaluated. The adsorbent was characterized physically and chemically by adsorption/desorption of N2 at 77 K, scanning electron microscopy, X-ray diffraction, and infrared spectroscopy. The equilibrium adsorption results for bone char can be successfully modeled by the Langmuir and Freundlich isotherms. Pseudo-first-order and pseudo-second-order models were used to describe the kinetic data and rate constants were evaluated. Kinetics of each dye was found to follow pseudo-second-order rate kinetic model, with great correlation (higher than 0.99). In order to reduce the number of experiments to achieve better dye removal efficiency, a 2³ full factorial design with three central points and six axial points was applied in the equilibrium experiments. The variables analyzed were agitation, temperature, and pH.
A. A. Seolatto, T. D. Martins, R. Bergamasco, C. R. G. Tavares, E. S. Cossich, and E. A. da Silva
FapUNIFESP (SciELO)
In this work, the biosorption of Cr3+ and Ni2+ by Sargassum filipendula pre-treated with CaCl2 was studied. Kinetic and equilibrium experiments were carried out for mono- and multi-component solutions in a batch reactor at pH 3.0 and 30 oC. The results from the kinetic experiments showed that Cr3+ adsorbs slower than Ni2+. This behavior was explained by means of a mechanistic analysis, which showed that Cr3+ uptake presented three adsorption stages, whereas Ni2+ adsorption presents only two. The mono-component equilibrium data, along with binary kinetic data obtained from mono-component experiments, showed that, although the kinetics for Cr3+ removal are slower, the biomass had a stronger affinity for this ion. Almost all Ni2+ is desorbed from the biomass as Cr3+ adsorbs. The binary equilibrium data also presented this behavior. The binary data was also modeled by using modified forms of the Langmuir, Jain and Snoeyink, and Langmuir-Freundlich isotherms. However, the prediction obtained presented low accuracy. An alternative modeling with artificial neural networks was presented and the results showed that this technique could be a promising tool to represent binary equilibrium data. The main contribution of this work was to obtain experimental data for Cr3+/Ni2+ adsorption, which is a system rarely found in the literature and that provides information that could be used in process modeling and simulation.
Daniel de A. Soares, Araceli A. Seolatto, Taísa de M. Campos, and Uaitã P. do Nascimento
IWA Publishing
A large part of the chemical industry sectors, particularly industrial surface treatments, contributes to the contamination of water bodies with heavy metals. The environmental laws have been stringent regarding discharge of effluents containing these compounds. This study evaluated the removal of metals Ni(II) and Zn(II) by adsorption on activated bone char residue. To evaluate the adsorption capacity, experiments were performed using kinetics in a monocomponent system and adsorption isotherms in monocomponent and bicomponent systems. The models used to fit the isotherms were the Langmuir and Freundlich.
A. Seolatto, C. J. S. Filho and D. Mota
Effluents containing metals may come from different types of industries, including paper mills, petrochemical plants, inorganic reagents and fertilizers, petroleum refining, steel foundries and metal working, textile mills, leather tanning, and others. These industries produce large volumes of wastewater requiring efficient and low-cost treatment. Pequi (Caryocar brasiliense Camb.) is a fruit native to the Brazilian cerrado, and its skin, which represents about 60% by weight of the fruit, is often overlooked during processing. In this work, pequi skins were used as biosorbent material in solutions containing chromium, lead, and cadmium. Factors such as biomass dose, pH, and biomass size were studied using a factorial statistical design. The results showed that the metal with the highest biosorption in the biomass was lead, with an average biosorption of 16.78 mg.g-1 and up to 80% removal of the solution, while there was less removal of chromium and cadmium. The dose of biomass and pH were found to be the most important factors in the biosorption. The grain size, on the other hand, generally did not influence the adsorption and can be discounted among the factors that act in the process.
Araceli A. Seolatto, Maurício M. Câmara, Eneida S. Cossich, Célia R. G. Tavares, and Edson A. Silva
IWA Publishing
The reusability of the alga Sargassum filipendula was studied in batch reactor and in fixed-bed column in order to investigate Zn(II)-laden biomass regeneration. Four types of desorbing solutions at two different concentrations were tested and the results obtained to the desorption efficiencies were higher than 90% for three of the agents. Ten consecutive sorption-regeneration cycles at a flow rate of 8 mL/min were carried in fixed bed column with the feed concentration of 50 mg/L and using two eluent solutions: H2SO4 (0.1 M) and MgSO4 (3.5% at pH 3), which showed the best ability to elution tests in batch system. The column was used for a period of 30 days. The adsorption capacity decreased the passing of cycles, but the total amount of zinc removed after 10 cycles was approximately 8 times greater than if the biomass had been used for only one time, for both agents tested. Therefore, the regeneration in the Sargassum filipendula column through the two desorbing agents tested showing high efficient use of biomass and facilitating the process of treatment of wastewater containing metals that has successive exchanges of biomass.
Márcia Teresinha Veit, Edson Antonio da Silva, Célia Regina Granhen Tavares, Márcia Regina Fagundes-Klen, Gilberto da Cunha Gonçalves, Araceli Aparecida Seolatto, and Luiz Gustavo de Lima Vaz
Springer Science and Business Media LLC
The application of fixed bed adsorption is an important separation technique used for heavy metals in environmental pollution control. To design a fixed bed column, it is necessary to find dynamics data in the breakthrough curve form. The objective of this study was to model the biosorption process of nickel by using biomass of Sargassum filipendula in a fixed bed column. Experimental data were generated at 30°C, pH 3, flow rate of 6 ml/min and feed concentrations of 1, 1.5, 2, 3, 5 and 6 mequiv/l. Langmuir isotherm was used to represent the equilibrium data in the column (qmax = 2.496 mequiv/g, b = 0.456 l/mequiv) and in a batch operation of the system (qmax = 1.577 mequiv/g, b = 0.269 l/mequiv). These Langmuir parameters were used to simulate the continuous adsorption process of nickel. The partial differential equations model has taken into consideration the mass transfer resistance in the biosorbent as the key controlling phenomenon, which adequately represented the dynamic biosorption process of nickel.
Araceli Aparecida Seolatto, Célia Regina Tavares, Eneida Sala Cossich, Edson Antonio da Silva, and Terezinha Aparecida Guedes
Universidade Estadual de Maringa
In order to conduct a study on the effect of important design parameters in nickel desorption from the macroalgae Sargassum filipendula , four agents were tested in sets of full 2 3 factorial designs (eluant agent, nickel load, initial acid concentration and solid:liquid ratio). Two responses were analyzed: the amount desorbed for the agents and the weight loss during the desorption process. The results showed that all factors were significant in both responses. Additionally, several interactions among the factors were also significant. Analyzing the contribution of each factor, it was verified that the best operational conditions were obtained for eluents H 2 SO 4 /MgSO 4 , at the highest tested concentration, highest nickel load and lowest solid:liquid ratio. In this configuration, the results obtained with the desorption (%) was greater than 95%, making the biosorption process very interesting in the treatment of nickel solutions. Once regenerated, the Sargassum filipendula biomass can be used in subsequent biosorption cycles, lowering biomass costs and facilitating the treatment process that does not require successive biomass changes.
Soraya Moreno Palacio, Fernando Rodolfo Espinoza-Quiñones, Raquel Manozzo Galante, Dilcemara Cristina Zenatti, Araceli Aparecida Seolatto, Evandro Kleber Lorenz, Carlos Eduardo Zacarkim, Nickeli Rossi, Márcia de Almeida Rizzutto, and Manfredo Harri Tabacniks
FapUNIFESP (SciELO)
The present work was performed using the common onion (Allium cepa L.) as a bioindicator of toxicity of heavy metals in river water. The test waters were collected at two sampling sites: at the beginning and the end of the Toledo River. The bulbs of A. cepa L. were grown in test water with nine concentration levels of copper, zinc and lead from 0.1 to 50 ppm. In the laboratory, the influence of these test liquids on the root growth was examined during five days. For test liquids containing below 0.03-ppm dissolved Cu the root growth was reduced by 40% However, the same reduction occurred for 1-ppm dissolved Zn. For dissolved Pb, results reveal toxicity above 0.1 and 0.6 ppm at the beginning and the end of the Toledo river water, respectively.