Regina F. P. M. Moreira | Universidade Federal de Santa Catarina - UFSC (Federal University of Santa Catarina) (original) (raw)

Papers by Regina F. P. M. Moreira

Adsorventes carbonados estao entre as melhores opcoes na remocao de compostos orgânicos volateis ... more Adsorventes carbonados estao entre as melhores opcoes na remocao de compostos orgânicos volateis (COV) de correntes gasosas, pela boa afinidade que apresentam com compostos dessa natureza, alem de baixo custo e disponibilidade. O presente trabalho avalia o desempenho do ciclo adsorcao/dessorcao de dois compostos orgânicos volateis (fenol e tolueno) em nanotubos de carbono (NTC) comparativamente a um carbono grafitizado de aplicacao tipicamente analitica (Carbotrap). As metodologias de amostragem e analise empregadas compreendem a coleta de gases por bombeamento (amostragem ativa) em cartuchos (tubos, contendo o material adsorvente) com posterior analise por cromatografia gasosa e espectrometria de massa (CG/EM), de acordo com o Metodo TO-17 da USEPA. Em relacao ao desempenho dos adsorventes, o nanotubo obteve clara vantagem em relacao ao Carbotrap, conseguindo reter mais adsorbato por massa de adsorvente. Alem disso, nao foi verificada interacao diferenciada do fenol e tolueno com o...

Acta Scientiarum. Technology, 2010

Os compostos orgânicos voláteis (COV) são importante classe de poluentes do ar, e a adsorção tem ... more Os compostos orgânicos voláteis (COV) são importante classe de poluentes do ar, e a adsorção tem sido largamente empregada no seu tratamento há vários anos. O presente trabalho utilizou metodologias analíticas convencionais para avaliar o nanotubo cup-stacked (CSCNT) na purificação de correntes gasosas contaminadas com COV. O CSCNT é constituído de múltiplas camadas de grafeno em formato cônico, apresentando extremidades abertas em sua superfície externa e canais centrais vazios. Foi adotado o Carbotrap como suporte do cup-stacked. O adsorvente-parâmetro de comparação do desempenho desse compósito foi o próprio Carbotrap (sem o nanotubo). Foi avaliada a capacidade de adsorção de cada adsorvente, bem como suas capacidades de saturação para cada uma das concentrações trabalhadas com os dois adsorbatos utilizados (1, 5, 20 e 35 ppm de tolueno e fenol). Na modelagem das curvas massaxtempo, utilizou-se o modelo da força motriz linear (LDF-linear driving force). A metodologia proposta para determinação das curvas massatempo mostrou-se aplicável a análises desta natureza. Em relação ao desempenho dos adsorventes, o compósito obteve clara vantagem em relação ao Carbotrap; os valores das capacidades de saturação para o compósito foram, em média, 67% superiores aos obtidos para o Carbotrap. Palavras-chave: adsorção, COV, cup-stacked, nanotubo de carbono, força motriz linear. ABSTRACT. Modeling volatile organic compounds (voc's) adsorption onto cupstacked carbon nanotubes (cscnt) using the linear driving force model. Volatile organic compounds (VOC's) are an important category of air pollutants and adsorption has been employed in the treatment (or simply concentration) of these compounds. The current study used an ordinary analytical methodology to evaluate the properties of a cupstacked nanotube (CSCNT), a stacking morphology of truncated conical graphene, with large amounts of open edges on the outer surface and empty central channels. This work used a Carbotrap bearing a cup-stacked structure (composite); for comparison, Carbotrap was used as reference (without the nanotube). The retention and saturation capacities of both adsorbents to each concentration used (1, 5, 20 and 35 ppm of toluene and phenol) were evaluated. The composite performance was greater than Carbotrap; the saturation capacities for the composite was 67% higher than Carbotrap (average values). The Langmuir isotherm model was used to fit equilibrium data for both adsorbents, and a linear driving force model (LDF) was used to quantify intraparticle adsorption kinetics. LDF was suitable to describe the curves.

Greenhouse Gases - Capturing, Utilization and Reduction, 2012

CO 2 in the flue gas can be comprised of a support, usually of high surface area, with an immobil... more CO 2 in the flue gas can be comprised of a support, usually of high surface area, with an immobilized amine or other reactant on the surface. Physical adsorbents can separate the CO 2 from the other flue gas constituents, but do not react with it. Instead, they use their cage-like structure to act as molecular sieves. These sorbents can be regenerated using a pressure swing or a temperature swing, although the costs associated with a pressure swing may be prohibitively high. Physisorbents such as activated carbon and zeolites will be safe for the local environment, and are generally relatively inexpensive to manufacture. Conventionally, activated carbon materials have been widely applied in industry for gas separation, and also have been investigated for CO 2 capture. Carbon dioxide emissions are frequently associated with large amounts of nitrogen gas, and thus an adsorbent selective to one of these compounds is required. These adsorbents should also be selective even at high temperatures, i.e., temperatures typical of carbon dioxide emission sources. Activated carbon is a suitable adsorbent and its CO 2 adsorption characteristics are dependent on its surface area and chemical surface characteristics. The surface chemistry of activated carbon is determined by the amount and type of heteroatom, for example oxygen, nitrogen, etc. Therefore, the adsorption capacity of activated carbon for carbon dioxide is a function of its pore structure and the properties of the surface chemistry. Strategies like PSA (pressure swing adsorption), TSA (temperature swing adsorption) and ESA (electric swing adsorption) processes have been proposed and investigated for adsorption in a cyclic process (Cavenati et al., 2006; Grande & Rodrigues, 2008; Zhang et al., 2008). PSA is a cyclical process of adsorption/desorption that occurs through pressure changes and can be very suitable for carbon dioxide separation from exhaust gases due to its easy application in a large temperature range. The most studies presents the CO 2 /N 2 separation using PSA process at room temperature, but it has been reported that is possible to obtain high purity CO 2 (~90%) at high temperature (Ko et al., 2005). Recently, Grande and Rodrigues (2008) reported that it is possible to recover around 89% of the CO 2 from a CO 2 /N 2 mixture using honeycomb monoliths of activated carbon through ESA. However, the temperature of the CO 2 /N 2 mixture in a typical exhaust gas can exceed 100 o C and at such temperatures the recovery and purity of CO 2 can be significantly modified.

Environmental Technology, 2021

Oil emulsified in water is one of the most difficult mixtures to treat due to the good stability ... more Oil emulsified in water is one of the most difficult mixtures to treat due to the good stability of emulsions, so there is a growing demand for more efficient methods for separating immiscible oil/water mixtures. In this context, the focus of this study was to obtain an adsorbent for the selective treatment of a simulated oily wastewater. To this aim, a modified hydrotalcite sample with hydrophobic and magnetic characteristics was prepared and characterized. Initially, the effect of sodium dodecyl sulfate (SDS) amount on the adsorbent characteristics was evaluated (266-800 mgSDS g-1LDH). The hydrophobic hydrotalcite (LDH-SDS) containing 533 mgSDS g-1LDH (LDH-SDS2) presented a higher interlayer space where the surfactant molecules were arranged perpendicular to the lamellae, allowing better access to the hydrotalcite pores and facilitating the selective adsorption of oil compounds. Moreover, the synergistic association of hydrophobic properties with super-wetting and effective adhesion oil to Fe3O4 favored the selective adsorption of the simulated oily wastewater onto the hydrophobic and magnetic hydrotalcite (LDH-MSDS), facilitating the post-treatment separation. The kinetic analysis demonstrated that the adsorption equilibrium was attained in 120 min and the pseudo-second order model was the most suitable for predicting the removal of total organic carbon (TOC) from the simulated oily wastewater. The Langmuir model described very well the equilibrium experimental data, with a maximum adsorption capacity for TOC removal using LDH-MSDS of 659.9 mg g-1. Therefore, the modified hydrotalcite prepared in this study showed intrinsic characteristics that make it a promising adsorbent for the selective treatment of oily wastewaters.

Environmental Progress & Sustainable Energy, 2021

Flotation sludge from the meat processing industry can be applied as biofuel in already existing ... more Flotation sludge from the meat processing industry can be applied as biofuel in already existing plant‐scale boilers. This biosolid is rich in oil and grease and has higher energetic content on a dry ash‐free basis (22.74 and 27.71 MJ kg−1) than the wood‐based fuel (16.62 and 16.16 MJ kg−1). Co‐combustion trials were performed at a pilot‐scale cyclonic combustor (100 kg h−1) and at an industrial flamotubular rotatory grate‐fired system (6000 kg h−1), co‐firing pre‐dried and centrifuged flotation sludges (respectively) and wood at a mass ratio of 1:3. At a moisture content of 60.13 wt%, the lower heating value of the centrifuged sludge was 10.24% lower compared to wood, thus reducing it to at least 40 wt% would be advisable to obtain energy gains in the industrial plant when operating the co‐combustion. The emissions were evaluated and compared to emission standards, including the characterization of polycyclic aromatic hydrocarbons and polychlorinated dibenzo‐p‐dioxins and polychlorinated dibenzofurans (given as Toxicity Equivalent Factors at O2ref = 7%), which have not yet been reported. The 16 target polycyclic aromatic hydrocarbons were identified at pilot and plant scales (0.582 ± 0.143 μg Nm−3 and 0.602 ± 0.506 μg Nm−3, respectively) being lower than the Danish reference standard (5.0 μg Nm−3). The polychlorinated dibenzo‐p‐dioxins and polychlorinated dibenzofurans concentrations were 0.0004 ± 0.0001 ng Nm−3 at pilot scale and 0.3617 ± 0.1310 ng Nm−3 at plant scale, both below the Brazilian and American standards but differed greatly between the scales, requiring further investigation since their formation can occur due to combustion and postcombustion conditions.

Ozone: Science & Engineering, 2017

ABSTRACT Ozone is an unstable and highly reactive gas applied in drinking water or wastewater tre... more ABSTRACT Ozone is an unstable and highly reactive gas applied in drinking water or wastewater treatment to oxidize and/or mineralize pollutants. Its application in wastewater treatment leads to a destruction of persistent pollutants combined with an improvement of biodegradability. The oxidation of organic and inorganic compounds in tannery wastewater at different pHs applying O3 was studied. Results after O3-treatment were determined by conventional wastewater parameters, e.g., total organic carbon (TOC), biochemical oxygen demand after 5 days (BOD5), and chemical oxygen demand (COD), as well as by substance-specific mass spectrometric analytical techniques, i.e., gas chromatography—mass spectrometry (GC/MS) and liquid chromatography—mass and tandem mass spectrometry (LC/MS and—MSn). In parallel, variations in the toxicity of the tannery wastewater against water organisms before and after O3-treatment were determined by means of biotoxicity testing, i.e., Daphnia magna Straus and Vibrio fischeri bioassays.

Waste Management, 2012

In the present work, selected agroindustrial solid residues from Brazil-biosolids from meat proce... more In the present work, selected agroindustrial solid residues from Brazil-biosolids from meat processing wastewater treatment and mixture of sawdust with these biosolids; residues from apple and orange juice industries; sugarcane bagasse; açaí kernels (Euterpe oleracea) and rice husk-were characterised as solid fuels and an evaluation of their properties, including proximate and ultimate composition, energy content, thermal behaviour, composition and fusibility of the ashes was performed. The lower heating value of the biomasses ranged from 14.31 MJ kg À1 to 29.14 MJ kg À1 , on a dry and ash free basis (daf), all presenting high volatile matter content, varying between 70.57 wt.% and 85.36 wt.% (daf) what improves the thermochemical conversion of the solids. The fouling and slagging tendency of the ashes was predicted based on the fuel ash composition and on the ash fusibility correlations proposed in the literature, which is important to the project and operation of biomass conversion systems. The potential for application of the Brazilian agroindustrial solid residues studied as alternative energy sources in thermochemical processes has been identified, especially concerning direct combustion for steam generation.

Energy, 2011

The biosolids originating from the wastewater treatment process of two meat processing plants (LF... more The biosolids originating from the wastewater treatment process of two meat processing plants (LFP and LFG) were characterized as a fuel and their potential for utilization as alternative energy sources was assessed through the combustion of LFP in a pilot scale cyclone combustor. A comparative evaluation of the LFP, LFG and SD (sawdust) properties as well as the emissions during the combustion test was performed. The high energy content of LFP (LHV (lower heating value) equal to 25.77 MJ kg À1) and LFG (LHV ¼ 25.89 MJ kg À1), both dry and ash free (daf), combined with the high volatile matter content (85.29 and 85.61 wt%, daf, respectively) improve the ignition and burning of the solids. Also, the fouling and slagging tendencies of the ashes were predicted based on the fuel ash composition and ash fusibility correlations. The emissions of CO, SO 2 , and NO x and total organic carbon (TOC) were compared to guideline limits established by Brazilian and international legislation. The TOC concentrations were below the emission limits. The high level of nitrogen in LFP (9.24 wt%, daf) led to high levels of NO x. In this regard, further combustion tests are being performed by the authors.

Brazilian Journal of Chemical Engineering, 2013

Besides high industrial development, Brazil is also an agribusiness country. Each year about 330 ... more Besides high industrial development, Brazil is also an agribusiness country. Each year about 330 million metrics tons (Mg) of biomass residues are generated, requiring tremendous effort to develop biomass systems in which production, conversion and utilization of bio-based products are carried out efficiently and under environmentally sustainable conditions. For the production of biofuels, organic chemicals and materials, it is envisaged to follow a biorefinery model which includes modern and proven green chemical technologies such as bioprocessing, pyrolysis, gasification, Fischer-Tropsch synthesis and other catalytic processes in order to make more complex molecules and materials on which a future sustainable society will be based. This paper presents promising options for valorization of Brazilian agroindustrial biomass sources and residues originating from the biofuel production chains as renewable energy sources and addresses the main aspects of the thermochemical technologies which have been applied.

Revista Virtual de Química

The removal of arsenic from natural water has been successfully performed using powdered iron oxi... more The removal of arsenic from natural water has been successfully performed using powdered iron oxides as adsorbent. However, low particle size adsorbents are not applicable in continuous large scale operation. Is this sense, the goal of this work is to produce industrial-scale nanostructured hematite pelletized applied to the removal of arsenic from wastewater. Pellets were prepared with the addition of bentonite (7% in mass) to produce a material suitable for use in fixed bed units. The pelletized solids, as well as a similar commercial material (GEH), were characterized by determination of friability, X-ray fluorescence (FRX), pH in the point of zero charge (pH pzc), specific area and pore size distribution, scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). The adsorption capacity was determined in finite bath and fixed bed column, evaluating the removal efficiency of arsenic in aqueous solution and effluent derived from acid mine drainage. The Langmuir and Freundlich models were used for fitting the adsorption isotherms, which presented adsorptive capacity of 9.0, 7.25 and 7.19 mg g-1 for NHP, NHP7B and GEH, respectively, in pH 4.0. The results of the adsorption in fixed bed column showed an adsorption capacity of 1.25x10-3 , 0.89x10-3 and 15.07x10-3 mg g-1 for NHP, NHP7B and GEH, respectively.

Langmuir

Graphite microparticles (d 50 6.20 μm) were oxidized by strong acids, and the resultant graphite ... more Graphite microparticles (d 50 6.20 μm) were oxidized by strong acids, and the resultant graphite oxide was thermally exfoliated to graphene oxide sheets (MPGO, C/ O 1.53). Graphene oxide was treated with nonthermal plasma under a SO 2 atmosphere at room temperature. The XPS spectrum showed that SO 2 was inserted only as the oxidized intermediate at 168.7 eV in the S 2p region. Short thermal shocks at 600 and 400°C, under an Ar atmosphere, produced reduced sulfur and carbon dioxide as shown by the XPS spectrum and TGA analysis coupled to FTIR. MPGO was also submitted to thermal reaction with SO 2 at 630°C, and the XPS spectrum in the S 2p region at 164.0 eV showed that this time only the nonoxidized episulfide intermediate was inserted. Plasma and thermal treatment produced a partial reduction of MPGO. The sequence of thermal reaction followed by plasma treatment inserted both sulfur intermediates. Because oxidized and nonoxidized intermediates have different reactivities, this selective insertion would allow the addition of selective types of organic fragments to the surface of graphene oxide.

Engenharia Sanitaria e Ambiental, 2009

... 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. Texto completo SciELO Brasil. Texto compl... more ... 1 / 1, LILACS, seleciona. para imprimir. Fotocópia. Texto completo SciELO Brasil. Texto completo. experimental, Documentos relacionados. Id: 537660, LILACS-Express. Autor: Amorim, CamilaCosta de; Leao, Monica Maria Diniz; Moreira, Regina de Fatima Peralta Muniz. ...

... BY FENTON-LIKE PROCESS José Luiz Tambosi*, Michele Di Domenico, Regina FPM Moreira Departamen... more ... BY FENTON-LIKE PROCESS José Luiz Tambosi*, Michele Di Domenico, Regina FPM Moreira Departamento de Engenharia Química e Engenharia de Alimentos Universidade Federal de Santa Catarina Abstract. ... Preis, S., Kamenev, S., Kallas, J., Munter, R. (1995). ...

Http Dx Doi Org 10 1080 01919512 2010 508194, Sep 1, 2010

ABSTRACT The recalcitrant pharmaceutical compounds carbamazepine, clofibric acid, diazepam, and d... more ABSTRACT The recalcitrant pharmaceutical compounds carbamazepine, clofibric acid, diazepam, and diclofenac were monitored in municipal wastewater by ESI-LC-MS and -MS-MS in positive and negative mode. Although biological treatment by conventional and membrane bioreactor failed, the advanced oxidation methods using ozone (O3), O3/UV or hydrogen peroxide in combination with UV (H2O2/UV), successfully achieved their complete elimination. Target compounds could be confirmed as permanently present pollutants in Aachen-Soers wastewater in concentrations between 0.006 and 1.9 μg L−1 prior to AOP treatment resulting in a complete elimination.

Http Dx Doi Org 10 1081 Ss 120027558, Jul 8, 2010

ABSTRACT A novel adsorbent carbon to remove iron from water was evaluated. Bench scale and pilot ... more ABSTRACT A novel adsorbent carbon to remove iron from water was evaluated. Bench scale and pilot scale tests were performed to characterize the mechanism of the iron removal. The adsorption equilibrium of iron removal can be described using the Langmuir isotherm, assuming a monolayer. In the absence of dissolved oxygen, Fe is adsorbed on the solid surface as a monolayer of 62.7 × 10 mat‐g·g, while the monolayer of oxidized iron coverage in the air‐equilibrated system is 72.7 × 10 mat‐g·g. The iron removal results from the adsorption of oxygen followed by the oxidation of Fe catalyzed by the adsorbent carbon surface. The Fe precipitates on the solid, forming a hydrated iron oxide‐coated carbon that is also able to adsorb iron. The kinetics of iron removal was modeled using the film and pore diffusion model. Pilot tests performed with and without pre‐aeration showed results similar to those observed on the bench scale.

Carbon, 2002

The reduction of SO on four carbons (graphite, charcoal, activated carbon and coke) was studied u... more The reduction of SO on four carbons (graphite, charcoal, activated carbon and coke) was studied under steady-state 2 conditions and when the kinetics was chemically controlled in a reactor operated under differential conditions. The reaction showed second-order kinetics: first order with respect to carbon and first order with respect to the partial pressure of SO .

Waste Management, 2015

Substantial increase in sewage sludge generation in recent years requires suitable destination fo... more Substantial increase in sewage sludge generation in recent years requires suitable destination for this residue. This study evaluated the gaseous emissions generated during combustion of an aerobic sewage sludge in a pilot scale moving bed reactor. To utilize the heat generated during combustion, the exhaust gas was applied to the raw sludge drying process. The gaseous emissions were analyzed both after the combustion and drying steps. The results of the sewage sludge characterization showed the energy potential of this residue (LHV equal to 14.5MJkg(-1), db) and low concentration of metals, polycyclic aromatic hydrocarbons (PAH), polychlorinated dibenzo-p-dioxins (PCDD) and polychlorinated dibenzofurans (PCDF). The concentration of CO, NOx, BTEX (benzene, toluene, ethylbenzene and xylenes) emitted from the sludge combustion process were lower than the legal limits. The overall sludge combustion and drying process showed low emissions of PCDD/PCDF (0.42ng I-TEQNm(-3)). BTEX and PAH emissions were not detected. Even with the high nitrogen concentration in the raw feed (5.88% db), the sludge combustion process presented NOx emissions below the legal limit, which results from the combination of appropriate feed rate (A/F ratio), excess air, and mainly the low temperature kept inside the combustion chamber. It was found that the level of CO emissions from the overall sludge process depends on the dryer operating conditions, such as the oxygen content and the drying temperature, which have to be controlled throughout the process in order to achieve low CO levels. The aerobic sewage sludge combustion process generated high SO2 concentration due to the high sulfur content (0.67wt%, db) and low calcium concentration (22.99gkg(-1)) found in the sludge. The high concentration of SO2 in the flue gas (4776.77mgNm(-3)) is the main factor inhibiting PCDD/PCDF formation. Further changes are needed in the pilot plant scheme to reduce SO2 and particulate matter emissions, such as the installation of exhaust gas-cleaning systems. According to previous studies, the efficient operation of such cleaning systems is also effective for metals emission control, which makes the combustion of sewage sludge a feasible treatment method from both energetic and environmental perspectives.

ASME 2008 2nd International Conference on Energy Sustainability, Volume 1, 2008

Ozone-science & Engineering, 2011

The elimination of the pesticide imazalil (IMZ) spiked into ultrapure water as well as into waste... more The elimination of the pesticide imazalil (IMZ) spiked into ultrapure water as well as into wastewater applying ozone (O3) and the identification of transformation products was investigated. O3 under hydroxyl radical suppression conditions reacted rapidly with the aliphatic double bond or the imidazole ring in IMZ, yielding several transformation products by partial oxidation. The structures of four oxidation products not

2011 5th International Conference on Bioinformatics and Biomedical Engineering, 2011