Papers by Fabiano Bisinella Scheufele
Social Science Research Network, 2021
Revista Brasileira de Energias Renováveis, Mar 28, 2019
As contaminações das águas superficiais por antibióticos vêm causando um efeito negativo de longo... more As contaminações das águas superficiais por antibióticos vêm causando um efeito negativo de longo prazo para a sustentabilidade ecológica prejudicando a vida aquática e a saúde humana. Neste contexto, a biossorção se configura como uma alternativa promissora para a remediação dessas águas contaminadas. Este trabalho teve como objetivo avaliar o melhor tratamento químico em relação à capacidade de adsorção da amoxicilina e da cefalexina pelo epicarpo do açaí. Inicialmente, foi determinado o ponto de carga zero (pHpcz) do biossorvente, logo após, realizaram-se testes de adsorção em diferentes pHs (3, 5, 7 e 9) com diferentes tratamentos (H3PO4 e NaOH (0,5 mol L -1 )). A impregnação do material adsorvente com o ativador químico ocorreu na proporção de 10 gramas de sólido por litro de solução, a mistura foi aquecida a 80 °C por 30 minutos e desidratado a 110 °C. Após 24 h, lavou-se o material com água destilada, a 100 °C, até a estabilização do pH e posteriormente secagem à 110 °C. Os resultados obtidos Revista Brasileira de Energias Renováveis, v.8, n.2, p.426-439, 2019 demonstraram que o (pHpcz) do biossorvente, com tratamento básico, foi de 5,9. O açaí com tratamento básico apresentou maior teor de remoção 95% para a cefalexina no pH 5. Verificouse assim que a adsorção foi favorecida com o tratamento básico fazendo com que a carga superficial do biossorvente torna-se mais negativa, alterando o pH do açaí. Portanto, evidenciase o ótimo potencial do epicarpo de açaí na remoção da cefalexina.
Journal of Food Processing and Preservation, 2022
Process Biochemistry, Nov 1, 2016
Abstract Green energy production connected with global warming is one of the hottest topics for i... more Abstract Green energy production connected with global warming is one of the hottest topics for industry, technology, and life science. Microalgae culture and its potential for industrial applications in CO2 fixation from flue gases for second generation biofuels and many other valuable metabolites’ production has received much attention in recent years. The goal of this review is to combine all the key knowledge obtained in state of the art studies in recent years about the modeling of photobioreactors (PBRs). In order to develop the complex PBR phenomenological model, we considered it as a system and applied the theory of system analysis on PBR. Special attention was given to decomposition principles of this theory where the PBR system was divided into sub-systems. Furthermore, this review shows how to combine the knowledge from modeling of sub-systems by taking into account relationships between them, and how such interrelationships influence the overall PBR modeling procedure for the particular microalgal cultivation process. The result of this work is a successful development of a complex PBR phenomenological model, which was presented as an independent original authors’ work.
DOAJ (DOAJ: Directory of Open Access Journals), Mar 1, 2012
<p class="aresumo">A soja possui ampla disponibilidade de componentes bioquímicos... more <p class="aresumo">A soja possui ampla disponibilidade de componentes bioquímicos como proteínas, polissacarídeos, lipídios, carboidratos, minerais, vitaminas, fibras, lecitina, dentre outros, tornando interessante sua utilização como substrato para a fermentação em estado sólido (FES). Este processo, apesar de não ser tão utilizado industrialmente quanto à fermentação submersa (Fsm), apresenta-se viável, pois tem apresentado resultados superiores de produtividade, principalmente no cultivo de fungos filamentosos e na produção de enzimas. Assim, o objetivo deste trabalho foi o de comparar a produção de diferentes tipos de complexos enzimáticos por FES utilizando diferentes tipos de sojas (orgânica, transgênica e convencional) com o fungo <em>Aspergillus niger</em>. Realizou-se a caracterização dos substratos para a produção de amilase, protease e lipase, avaliação das curvas de crescimento do microrganismo e das condições ótimas de produção da protease utilizando planejamento de experimentos. As maiores atividades enzimáticas no estudo dos parâmetros da fermentação foram observadas para a protease, utilizando soja convencional com umidade inicial de 50%, 144h de fermentação, concentração inicial do inóculo de 4.10<sup>6</sup> esporos g<sup>-1</sup> e tamanho de partícula de 0,6 mm. O estudo de otimização do processo indicou que os melhores resultados de atividade enzimática para a protease foram obtidos em pH 3,0 e tamanho de partícula dos grãos de soja de 0,6 mm após a fragmentação para as fermentações.</p>
Determinação do conteúdo de açúcares redutores totais (ART) ... 3.12.6 Determinação da atividade ... more Determinação do conteúdo de açúcares redutores totais (ART) ... 3.12.6 Determinação da atividade enzimática (AE) total em papel filtro .. 3.12.7 Determinação do conteúdo de hemicelulose .
Environmental Technology, Feb 26, 2018
(F.B. Scheufele). (=15.38 mg g-1 and. Speciation diagram of Zn species along with the leached spe... more (F.B. Scheufele). (=15.38 mg g-1 and. Speciation diagram of Zn species along with the leached species demonstrated that, for the studied pH range, the biosorption was the most likely phenomena rather than precipitation. Finally, the hybrid neutralization/biosorption process showed great potential since both the Zn concentration levels and the pH reached the legislation standards (C Zn =4 mg L-1 ; pH=5). Hence, based on the characterization and biosorption results, a comprehensive evaluation of the involved mechanisms in such complex system helped to verify the prospective of FS biosorbent for Zn treatment from solution, in both individual and hybrid process.
Chemical Engineering Journal, 2017
This work focused in the assessment of the potential of reactive blue dye 5G (RB5G) adsorption by... more This work focused in the assessment of the potential of reactive blue dye 5G (RB5G) adsorption by polymeric adsorbent Dowex Optipore SD-2 (DOSD-2) in closed batch system by a phenomenological investigation of the adsorption process by both experimental data and mathematical modeling of kinetics, equilibrium and thermodynamics. The kinetic model of adsorption on the adsorbent sites described experimental data, consequently the adsorption itself is the rate-limiting step of the
Este trabalho teve como objetivo a avaliação da cinética e equilíbrio do processo de secagem do b... more Este trabalho teve como objetivo a avaliação da cinética e equilíbrio do processo de secagem do bagaço com a finalidade de melhorar a sua eficiência num processo de remoção do corante têxtil. Os experimentos de cinética foram realizados em estufa com circulação de ar, em camada fina. O equilíbrio de sorção de umidade foi determinado pelo método estático, entre 35 e 65°C. Para todas as temperaturas avaliadas, o processo de secagem apresentou período de taxa de secagem decrescente, o qual foi melhor representado pelo modelo Dois Termos. Os valores de difusividade variaram entre 6,47.10-9 e 3,97.10-8 m 2 s-1 e a energia de ativação foi 30,20 kJ mol-1. Os dados de equilíbrio apresentaram dependência da temperatura, com isotermas no formato sigmoidal melhor representados pelo modelo de Oswin. Em todas as temperaturas avaliadas, o processo de secagem apresentou cinética favorável, viabilizando sua utilização como adsorvente.
Materials advances, 2021
Templated porous carbon materials (TPCMs) have recently received attention due to their many appl... more Templated porous carbon materials (TPCMs) have recently received attention due to their many applications. In this context, this work focused on the development of a simple synthesis method to produce highly porous carbon materials, by applying commercial sugar as a carbon source, pyrolyzed silica (as a template) and deionized water. The synthesis of the materials consisted of: (i) gel formation, wherein the mass ratio sugar/template (S/T) was evaluated as well as the deionized water volume; (ii) carbonization: the gels were carbonized under an N 2 inert atmosphere at a heating rate of 10 1C min À1 and a temperature of 700 1C for 1 h; and (iii) template leaching, in which two leaching agents were evaluated (NaOH and HF) for silica template removal. In order to evaluate the potential and characteristics of the TPCMs, morphological, textural and chemical characterization were carried out through N 2 and CO 2 physisorption, Raman spectroscopy, X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FT-IR). Overall, the NaOH-leached materials reached similar chemical and textural properties when compared to the HF, which is interesting from the economical, safety and environmental points of view. The N 2 physisorption analyses evidenced the synthesis of a highly porous material after the removal of the template; C1-I (NaOH leaching) showed a specific surface area of 462 m 2 g À1 and a micropore area of 610 m 2 g À1 , and elevated pore volume (1.04 cm 3 g À1), wherein micropores (0.21 cm 3 g À1) and mesopores (0.83 cm 3 g À1) were identifiedmost interesting values for the best TPCM amongst the studied conditions. An average diameter value of ultramicropores and supermicropores (2.9 Å) was also identified by CO 2 physisorption. The XRD diffractograms and Raman analyses indicated the formation of a semi-crystalline structure in the templated porous carbon material (TPCM), with large domains of graphite and graphene oxide sheets in a random pattern (turbostratic), along with amorphous carbon. From the FT-IR analysis it was possible to determine that the carbonized samples underwent partial oxidation and to identify the presence of bonds and vibrations of the aromatic skeleton (nOH, nC-H and nCQC). Overall, the characterization of the TPCMs, produced from simple raw materials, have demonstrated the great potential of this synthesis method for highly porous carbonaceous materials.
Separation and Purification Technology, Dec 1, 2018
The objective of this work was to maximize the efficiency of the ciprofloxacin (CIP) removal in f... more The objective of this work was to maximize the efficiency of the ciprofloxacin (CIP) removal in fixed-bed column, packed with SGC650H resin, by the optimization of the volumetric flow rate (Q) and bed height (H bed). For this, a hybrid procedure based on statistical and phenomenological modeling was used. Based on a central composite rotatable design (CCRD) the conditions of Q and H bed were defined to obtain breakthrough curves, wherein only 8 of a total of 11 assays were experimentally obtained. Based on the resin textural characterization and molecular dimensions analysis of the ciprofloxacin, phenomenological models were employed to describe the experimental data. The most accurate mathematical model for the breakthrough curves description, namely, adsorption on the sites model (AS) was validated with the experimental results of the CCRD and further used to predict other experimental 2 conditions. For this, independent experiments were performed to evaluate the proposed methodology, which demonstrated a predictive capacity of the model and allowed the fixed-bed column performance optimization, achieving a maximum efficiency of 81.5%. In general, the presented data may be useful for the development of fixed-bed systems. In addition, the results evidenced the potential of the adsorption process for trace-level pollutants treatment, due to elevated CIP adsorption capacities and high affinity to the SGC650H resin as well as favorable kinetics. Besides, by applying predictive phenomenological modeling, the hybrid proposed approach presents a perspective to support the optimization and scale-up of fixed-bed column operation, thus allowing the application of the treatment method in industrial scale.
Journal of Materials Science, Feb 26, 2018
We present a feasibility study of different adsorbent materials, namely residual fish scales bios... more We present a feasibility study of different adsorbent materials, namely residual fish scales biosorbent (FS), mineral dolomite (DL) and commercial resin (CR) in the heavy metals removal in multicomponent solution based on the properties of a real effluent from automotive battery recycling industry. Considering the effluent complex characteristics, the materials were assessed aiming to provide not only the heavy metals removal, but also the effluent neutralization and lower sludge generation. For this, all the studied materials were physicochemically and morphologically characterized with the aim of understanding the mechanisms involved in the process. Further, the elemental compositions of the solid and liquid phases generated from each treatment process were assessed by X-ray fluorescence spectrometry. The effluent presented highly acidic characteristics and heavy metals above the legislated limits for discharge (Fe, Zn and Pb). Each adsorbent material followed different mechanisms which led to dissimilar removal and neutralization capacities. The CR showed remarkable heavy metals removal capacity governed by an ion exchange mechanism; conversely, it did not show a neutralization effect. In contrast, FS and DL presented lower removal capacities by complex simultaneous phenomena (ion exchange, precipitation and/or complexation), but a great neutralization potential related to leaching of alkaline constituents. When sludge generation is considered as a key factor, mitigation and enhancement of treated effluent quality could
Acta Scientiarum-technology, Feb 26, 2021
The objective of this work was to evaluate the ability of CCC as an adsorbent material for the ac... more The objective of this work was to evaluate the ability of CCC as an adsorbent material for the acidity removal of RFO, aiming at the application of the oil in biodiesel production. For that, a RCCD was used for FFA removal by applying the CCC and CAC for comparative purposes. In the RCCD removal assays the effect of the Temperature, Agitation and Mass factors were assessed over acidity removal of the oil. Under the best conditions from RCCD, an evaluation of adsorption kinetics was performed, wherein it was observed the equilibrium was reached within 4 h, for the CCC. Also, the influence of the adsorbent dosage was performed. It was verified that 4 g was sufficient to allow the system to reach the maximum FFA removal. Overall, the CCC presented results approximately twice as high than those obtained by the CAC, mainly due to the pore size distribution which led to a "molecular sieving effect" for the CCC adsorbent. It allowed the major diffusion of the FFA molecules inside its narrow-distributed pores, whereas the CAC with a wider pore distribution (up to 260 Å) resulted in the larger molecules competition for the active sites inside the porous structure. The adsorbents' characterization also evidenced that CCC adsorbent presented a higher content of oxygenated groups in its surface which acted as potential active sites for the FFA molecules resulting in an enhanced adsorbent-adsorbate affinity. Lastly, the wastes generated in the adsorption experiments, were evaluated as to their calorific power resulting in a value of 31,933 J g-1 , suggesting that it could be further used for energetic purposes, such as a solid fuel for boilers and furnaces to generate thermal energy. Based on these results, the CCC stands out as a promising material for RFO acidity removal.
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Papers by Fabiano Bisinella Scheufele