Papers by Rosângela Bergamasco
Avanços dos estudos científicos na área das ciências exatas, 2022
Aluno de doutorado da Pós-Graduação em Engenharia Química da Universidade Estadual de Maringá. lu... more Aluno de doutorado da Pós-Graduação em Engenharia Química da Universidade Estadual de Maringá. [email protected] Aluna de doutorado da Pós-Graduação em Engenharia Química da Universidade Estadual de Maringá. [email protected] Professor da Faculdade de Engenharia e Inovação Técnico Profissional FEITEP. [email protected] Aluno de doutorado da Pós-Graduação em Biotecnologia Ambiental da Universidade Estadual de Maringá. [email protected] Professora do Departamento de Engenharia de Alimentos da Universidade Estadual de Maringá. [email protected] Professora do Departamento de Engenharia Química da Universidade Estadual de Maringá. [email protected]
Revista UNINGÁ Review, 2019
Nanotechnology enables the control of matter at nanoscale and the creation of materials that have... more Nanotechnology enables the control of matter at nanoscale and the creation of materials that have properties with a specific function, which allows its application in many fields. The Fields that are most affected by nanotechnology in environmental applications including water treatment are divided into: treatment and remediation, sensing and detection and pollution control. The use of nanostructured iron oxides like maghemite has been deeply studied due to the advantages that this material has in comparison to other materials. Its characteristics include its low cost, ease of separation through external magnetic fields, high surface area, high adsorption capacity and efficient action as a photocatalyst. This facilitates its use in processes such as coagulation flocculation. Considering this context, the present study, which is a bibliographic review, aims to contribute with the current bibliography about the use of nanoparticles of iron oxide in water treatment. Given the topic app...
Environmental Technology, 2021
Safranin orange (SO) is a cationic dye widely used in industrial sectors. It becomes a threat to ... more Safranin orange (SO) is a cationic dye widely used in industrial sectors. It becomes a threat to the aquatic ecosystem once it reaches water resources, directly affecting photosynthetic activity and dissolved oxygen rate. In view of this scenario and considering the large production of agro-industrial waste, which provides significant disposal costs and environmental impacts, the agricultural by-products such as mandarin peels (MP) are being used as biosorbent materials. Thus, this work proposed the use of MP for SO adsorption. The material was characterized by SEM, zeta potential, and FTIR analysis, in which it was possible to verify heterogeneous porous morphology, predominantly negative surface, and organic functional groups that facilitate adsorption. The results were promising, wherein the maximum adsorption capacity was 464 mg g-1 (318 K), 0.4 g L-1 adsorbent concentration, 120 minutes equilibrium time and removal percentage of 84.75%. The experimental data showed a better fit to the Langmuir and pseudo-second order mathematical models. The thermodynamic analysis inferred spontaneous, endothermic, and reversible character for SO adsorption onto MP. The main proposed adsorptive mechanisms were hydrogen bonds, π-interactions, and electrostatic interactions. In addition, the reuse of MP showed good efficiency since the adsorption capacity was maintained above 50% after four cycles (from 77.90 to 41.55 mg g-1). Moreover, when evaluating the effect of pH and ionic strength, it verified that the adsorption efficiency was not reduced. Therefore, when compared with other materials, the versatility and potential applicability of MP as a low-cost adsorbent for wastewater treatment is notable.
Science of The Total Environment, 2020
A wide variety of chemical compounds are used in human activities; however, part of these compoun... more A wide variety of chemical compounds are used in human activities; however, part of these compounds reach surface water, groundwater and even water considered for potable uses. Due to the limited efficiency of water treatment by the Water and Wastewater Treatment Plants, the presence of these compounds in natural and human consumption waters can be very harmful due to their high persistence and adverse effects; these characteristics define the contaminants of emerging concern (CECs). Water treatment by Electrochemical Advanced Oxidation Processes (EAOPs) has been evaluated as a promising process for the removal of persistent and recalcitrant organic contaminants. With this background, the present review aims to gather studies and information published between 2015 and 2020 regarding the occurrence of CECs in surface, potable and groundwater, its treatment by EAOPs, the main operating conditions and by-product generation of EAOPs, contaminant toxicity assessments and international statutory guideline values concerning CEC standards and allowable concentrations in the environment and treated drinking water. Therefore, in this review it was found that the compounds bisphenol A (BPA), diethyltoluamide (DEET), 17α-ethinyl estradiol (EE2), perfluorobutanoic acid (PFBA), carbamazepine, caffeine and atrazine were the most frequently detected in water sources, with concentrations ranging from 35.54-4800, 1.21-98, 0.005-38.5, 5-742.904, 0.0071-586, 0.89-1040, and 100-323 (ng L-1), respectively. Among the operational conditions of EAOPs, current density, pH and oxidant concentration are the main operational parameters that have an influence on these treatment technologies, besides the by-products generated, which might be removed by the integration of EAOPs with biological digestion treatments. Regarding the values of water quality standards, many CECs do not have established standard allowable concentration values, which represents a concern toward the possible toxic effects of these compounds on non-target organisms.
Environmental Technology, 2019
In this work, the adsorption of sodium diclofenac (DCF) on graphene oxide nanosheets (GON) was ev... more In this work, the adsorption of sodium diclofenac (DCF) on graphene oxide nanosheets (GON) was evaluated. GON was synthesized by the modified Hummers method and characterized regarding its composition, morphology, and surface load. It was applied in batch adsorption tests. The process was evaluated from the kinetic, isothermal and thermodynamic properties, and parameters such as adsorbent mass and solution pH were optimized. The best working condition was observed at the natural pH of the solution (6.2) and 0.25 g L-1 adsorbent dosage. The pseudo-first-order and pseudo-second-order models were applied to verify the behavior of the adsorption kinetics, and the adsorption isotherms were also developed at temperatures ranging from 25 to 45 °C. The isotherm models of Langmuir, Freundlich, and Temkim were applied to the equilibrium data. The thermodynamic parameters of enthalpy, entropy, and Gibbs free energy were evaluated to describe the behavior of the adsorptive process. The maximum adsorption capacity of DCF at 25 °C was 128.74 mg g-1 with a removal rate of 74 % in 300 minutes. The process was favourable and spontaneous with adsorptive capacity decreasing with increasing temperature. In addition, an adsorption mechanism was proposed to show the possible bonds that occur between adsorbate and adsorbent and the interactions formed through the influence of pH.
LWT, 2018
The demand for healthier and less processed food preservatives, which also accumulate therapeutic... more The demand for healthier and less processed food preservatives, which also accumulate therapeutic properties, has attracted the attention of consumers and industries, tus boosting the search for new technologies. The aim of the present work was to evaluate the thickening action performance of Moringa seed extracts in the elaboration of yoghurt. For this purpose, we evaluated the impact of the addition of different fractions of Moringa seed saline extract obtained via ultrafiltration in yogurt fermented by culture probiotic lactic production. In order to evaluate the influence of Moringa additives in final products, analysis of texture, pH, total protein content, susceptibility to syneresis, besides rheology assays, were performed throughout a four week storage-refrigerated period. Results revealed that yogurts added with Moringa extracts presented lower syneresis values, higher protein contents, higher consistency index values and more cohesive casein net, when compared to the control. This study endorses the potential application of Moringa seed extracts as thickener agents in food systems, which could represent a new option in the market of natural food additives.
Chemical Engineering Journal, 2019
Two-stage integrated system photo-electro-Fenton and biological oxidation process assessment of s... more Two-stage integrated system photo-electro-Fenton and biological oxidation process assessment of sanitary landfill leachate treatment: an intermediate products study,
Materials Research, 2017
In this article was developed a green synthesis of CuO nanoparticles on vegetal activated carbon ... more In this article was developed a green synthesis of CuO nanoparticles on vegetal activated carbon (VAC), using pomegranate leaf extract as reducing and stabilizing agent in the removal of multiple pollutants. The impregnated carbons with CuO nanoparticles were characterized morphologically and structurally. The SEM and XRD analysis, after carbons modification, showed that the surface structure remained porous with CuO nanoparticles sizes between 40 and 78 nm. As concern to the contaminants atrazine, caffeine and diclofenac, it is observed that the maximum adsorption capacities practically did not suffer interference by the presence of 1.5% Cu nanoparticles, keeping their values very close to those obtained with pure carbon. The nitrate removal was favored by the impregnation of CuO nanoparticles, from 0.93 mg g-1 to 4.09 mg g-1. The results are promising and demonstrate that it is possible to obtain VAC impregnated whit nanoparticles of CuO by a non-polluting and low cost method.
Journal of environmental management, 2017
Pharmaceutical pollutants are of significant effect on the environment, so that their treatments ... more Pharmaceutical pollutants are of significant effect on the environment, so that their treatments have been addressed in many studies. Activated carbon (AC) adsorbent shows best attraction for these compounds due to its unique characteristics represented by high capacity and porosity. In this article, the adsorption performance of AC towards non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen, ketoprofen, naproxen, and diclofenac were reviewed. According to collected data, maximum adsorption capacities of 417, 25, 290, and 372 mg/g were obtained from Langmuir isotherm for these drugs, respectively. The values of 1/n for Freundlich isotherm were lower than unity for all studied drugs, confirming the nonlinear and favorable adsorption. In addition, kinetics data were well represented by the pseudo-second-order model and mechanism was not controlled by the pore diffusion step alone. AC adsorption demonstrated superior performance for all selected NSAIDs, thus being efficien...
The Canadian Journal of Chemical Engineering, 2017
This article has been accepted for publication and undergone full peer review but has not been th... more This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as
International Journal of Chemical Reactor Engineering, 2007
Stevia rebaudiana is a plant native of South America, and its active constituents are considered,... more Stevia rebaudiana is a plant native of South America, and its active constituents are considered, by Food Science researchers, the "sweeteners of the future." Therefore, research on this plant has been increased. Stevia is a source of natural diet sweetening, without calories and safe for health. Its crude extract, however, is foul-smelling, bitter tasting, and dark brown; subsequent purification is essential to obtain a product of commercial quality. In this work, adsorption in modified zeolites associated with the filtration with membranes was applied in order to purify stevia crude extract. For the adsorption process, 40 g of CaX modified zeolites were used. In the ultrafiltration process, membranes with porosities of 0.05, 0.1 and 0.2 ?m were used. The transmembrane pressure was fixed at 2, 4 and 6 bar for each membrane. The best conditions of flux were obtained with the 0.2 ?m membrane and 6 bar, resulting in high clarification and recuperation of stevioside (91.75%)....
Ambiente e Agua - An Interdisciplinary Journal of Applied Science, 2019
Granular activated carbon was loaded with 0.5% manganese and 1.0% iron (m/m) for glyphosate remo... more Granular activated carbon was loaded with 0.5% manganese and 1.0% iron (m/m) for glyphosate removal from aqueous solutions. The adsorbent material was characterized by scanning electron microscopy, dispersive energy spectrometry, nitrogen adsorption techniques and zeta potential analyses. Batch studies were performed to investigate the adsorption equilibrium, kinetics mechanisms and to obtain thermodynamic information. Glyphosate adsorption increased with the contact time and achieved equilibrium within 24 h, with a maximum adsorption capacity of 9.19 mg g-1 at 45°C. Batch kinetic experimental data obeyed the pseudo-second-order model with R2>0.99. Adsorption isotherm experiments were carried out at 5, 15, 25, 35 and 45°C. The adsorption isotherms presented a better fitting using the Freundlich model (R2>0.98), indicating a multilayer adsorption of glyphosate. Thermodynamics studies showed that the adsorption of glyphosate onto granular activated carbon loaded with manganese ...
DESALINATION AND WATER TREATMENT, 2021
Diclofenac sodium is a pharmaceutical that is extensively prescribed and consumed worldwide. Cons... more Diclofenac sodium is a pharmaceutical that is extensively prescribed and consumed worldwide. Consequently, its release into water bodies has become a global concern, as it poses ecotoxicity, leading to severe public health and environmental problems. A literature research was performed to find a low-cost adsorbent with cationic characteristics that could be used to remove anionic contaminants from water, such as diclofenac sodium. In view of the above, this work aimed to investigate diclofenac sodium (DFS) removal using eucalyptus wood biochar (EWB) through the adsorption process. EWB was characterized by various techniques to obtain information regarding its surface charge, morphology and functional groups. Scanning electron microscopy displayed a porous surface, and Fourier-transform infrared spectroscopy showed a notable number of functional groups on the EWB surface. Brunauer–Emmett–Teller presented an ABET of 619.35 m2 g–1 and the point of zero charge was 7.98. The influence of...
Revista Águas Subterrâneas, 2011
Concentrações elevadas de compostos nitrogenados e metais pesados em desacordo com os parâmetros ... more Concentrações elevadas de compostos nitrogenados e metais pesados em desacordo com os parâmetros exigidos pela Portaria do Ministério da Saúde número 518/2004, ingeridos pelo homem, podem causar efeitos adversos a saúde. Assim, o objetivo da presente pesquisa foi avaliar a presença de compostos nitrogenados e metais pesados na água subterrânea provenientes de poços artesianos na cidade de Maringá-PR. Foram coletadas 10 amostras de água em poços de diferentes locais da área urbana, destes constatada a presença de nitrato acima do limite máximo de potabilidade em 4 amostras principalmente na área central da cidade.
Ambiente e Agua - An Interdisciplinary Journal of Applied Science
The main objective of this study was to synthesize a nanocomposite using graphene and manganese f... more The main objective of this study was to synthesize a nanocomposite using graphene and manganese ferrite nanoparticles (MnFe2O4-G) and to evaluate its antibacterial activity for water treatment purposes. Its morphological characteristics were evaluated by instrumental techniques, such as scanning electron microscopy and transmission electron microscopy. The characterization results indicated that the nanocomposite presented nanoparticles of approximately 25 nm well dispersed in transparent and large (14 μm) graphene nanosheets. The antibacterial activity was evaluated in a batch experiment using a concentration of 40 μg mL-1 of nanocomposite (MnFe2O4-G, bare MnFe2O4 nanoparticles or graphene oxide), 1x105 CFU mL-1 of Escherichia coli, and 8 h of contact time at room temperature. The highest antibacterial capacity was observed for the hybrid nanocomposite (91.91%), due to the synergic effect of graphene and MnFe2O4 nanoparticles. Various mechanisms were proposed to explain the effecti...
Revista Gestão & Sustentabilidade Ambiental
O acesso à água é essencial a manutenção da vida dos seres humanos, entretanto mesmo sendo indisp... more O acesso à água é essencial a manutenção da vida dos seres humanos, entretanto mesmo sendo indispensável, a própria atividade antrópica a torna poluída. Faz-se necessário o desenvolvimento de técnicas alternativas que sejam eficientes na remoção de poluentes, de fácil implementação e possuam viabilidade econômica, dentre tais alternativas o processo de adsorção apresenta-se como uma boa solução. A adsorção consiste na separação de uma fase fluida denominada adsorvato, por meio de uma fase sólida porosa denominada adsorvente, que possui características para aderir uma das espécies que estavam contidas na fase fluida inicialmente, tal capacidade dos adsorventes varia dependendo das características dos materiais, da extensão das alterações químicas, e da concentração de adsorvato. Os compostos farmacêuticos são substâncias amplamente presentes na sociedade moderna, produzidos para atingirem rotas metabólicas de seres humanos e animais, causam por consequência efeitos colaterais, tais p...
Journal of Water Process Engineering
Abstract The textile industry generates large amounts of effluents, often treated by coagulation/... more Abstract The textile industry generates large amounts of effluents, often treated by coagulation/flocculation. The tannin-based coagulants produce a high-quality treated effluent and a more biodegradable sludge. Efforts have been made to reuse the sludge, however, the synthesis of hydrochars and activated hydrochars from this residue was never evaluated before. Therefore, this study aimed to produce a novel sludge-based adsorbent, through hydrothermal carbonization (HTC) and KHCO₃ activation, from real laundry wastewater treated with tannin (Tanfloc SG), in order to remove methylene blue (MB) from aqueous solutions. Tanfloc SG coagulant was more effective to reduce color and turbidity than chemical oxygen demand. The best coagulant concentration (140 mg L−1) was selected to produce sludge, the hydrochar (HC-S), and activated hydrochar (AHC-S). The characterization demonstrated that activation volatilized the organic matter, leaving coke and inorganic solids. However, despite the lower carbon content, AHC-S presented a notorious surface area (3005.57 m² g−1). Minerals were presented in the adsorbents and AHC-S showed graphene-like layers. Regarding MB adsorption, pseudo-second-order and Langmuir models fitted kinetic and equilibrium data, respectively. HC-S and AHC-S obtained qmax of 69.77 and 808.83 mg g−1, respectively, and the latter was higher than other activated hydrochars, demonstrating the potential of the adsorbent.
A saude humana esta intimamente ligada a qualidade da agua de consumo. A disponibilidade de agua ... more A saude humana esta intimamente ligada a qualidade da agua de consumo. A disponibilidade de agua subterrânea, a facilidade de perfuracao de pocos, o baixo custo de captacao e tratamento, a menor sucetibilidade a contaminacao, vem aumentando a quantidade de pocos em sistemas de abastecimento publicos. Assim, este estudo visou avaliar a qualidade da agua de 20 pocos tubulares profundos de abastecimento publico rural do municipio de Santa Helena - Parana, por meio de analises de coliformes totais, termotolerantes e Escherichia coli, no periodo de 2004 a 2008. Analises pontuais foram realizadas em 2004, sendo repetidas nos mesmos pocos em 2008, com monitoramento de seis meses. Os resultados em 2004 mostraram a ocorrencia de contaminacao por coliformes totais (10 pocos) e termotolerantes (2 pocos). Ambos estao em desacordo com os padroes de potabilidade vigentes (Portaria No518/2004-MS). Em 2008, constatou-se um aumento de pocos contaminados em relacao a 2004. O aumento de pocos contamin...
Environmental Technology
A distributed parameter model and two lumped parameter models were used in order to find the rate... more A distributed parameter model and two lumped parameter models were used in order to find the rate-limiting step in the adsorption process of a herbicide (Diuron) by Moringa oleifera husks, a possible low-cost adsorbent. For that, 4 kinetics assays, differentiated by the initial Diuron concentration, were performed. Langmuir isotherm well represented the equilibrium data and through this evaluation, Moringa husks proved to be a potential adsorbent for Diuron removal from water. The internal mass transfer resistance, analyzed as a distributed parameter model, was found to better represent the experimental data. This fact enabled the simulation of the process according to the variation of time and space, what contributed to the better understanding of the adsorption process.
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Papers by Rosângela Bergamasco