Estudo de métodos de tratamento de efluentes (troca iônica e eletroquímico) separados e sequenciais para eliminação de derivados de petróleo

The produce of waste and the amount of the water produced coming from activities of petroleum production and extraction has been a biggest challenge for oil companies with respect to environmental compliance due to toxicity. The discard or the reuse this effluent containing organic compounds as BTEX (benzene, toluene, ethylbenzene and xylene) can cause serious environmental and human health problems. Thus, the objective this paper was study the performance of two process (separately and sequential) in one synthetic effluent for the benzene, toluene and xylene removal (volatile hydrocarbons presents in the produced water) through of electrochemical treatment using Ti/Pt electrode and exchange resin ionic used in the adsorption process. The synthetic solution of BTX was prepared with concentration of 22,8 mg L-1, 9,7 mg L-1 e 9,0 mg L-1, respectively, in Na2SO4 0,1 mol L-1. The experiments was developed in batch with 0.3 L of solution at 25ºC. The electrochemical oxidation process was accomplished with a Ti/Pt electrode with different current density (J = 10, 20 e 30 mA.cm-2). In the adsorption process, we used an ionic exchange resin (Purolite MB 478), using different amounts of mass (2,5, 5 and 10 g). To verify the process of technics in the sequential treatment, was fixed the current density at 10 mA cm-2 and the resin weight was 2.5 g. Analysis of UV-VIS spectrophotometry, chemical oxygen demand (COD) and gas chromatography with selective photoionization detector (PID) and flame ionization (FID), confirmed the high efficiency in the removal of organic compounds after treatment. It was found that the electrochemical process (separate and sequential) is more efficient than absorption, reaching values of COD removal exceeding 70%, confirmed by the study of the cyclic voltammetry and polarization curves. While the adsorption (separately), the COD removal did not exceed 25,8%, due to interactions resin. However, the sequential process (electrochemical oxidation and adsorption) proved to be a suitable alternative, efficient and cost-effectiveness for the treatment of effluents petrochemical.

Síntese, estrutura e propriedades de polímeros de coordenação à base de íons lantanídeos e ácidos benzenodicarboxílicos

Metal Organic Frameworks (MOFs) are hybrids materials, often crystalline, consisting of metal or metal clusters, connected by polytopic organic ligands repetitively, leading to structures, usually porous. In this work, MOFs based on lanthanide ions (La3+ and Gd3+) and dicarboxylate type of ligands (isophthalic and terephthalic acids), were synthesized by hydrothermal, solvothermal and hydro(solvo)thermal methods. The effects of the synthetic route as well as the type of heating, conventional or by microwave, on the structure and properties of MOFs were studied. The powder samples obtained were characterized by X-ray diffraction, infrared spectroscopy, thermal analysis and scanning electron microscopy. The results suggest that the addition of an organic or inorganic base is needed to promote the deprotonation of the ligand, since in the samples prepared by the hydrothermal method, without the use of a base, no formation of the metalorganic framework was observed. On the other hand, the presence of DMF as solvent or cosolvent, afforded the deprotonation of the ligand with the consequent formation of MOFs. At least two different crystalline structures were identified for the samples prepared with terephthalic acid. These samples are isostructural with those reported for phases Eu(1,3-BDC)DMF, Eu2(1,4-BDC)3 (DMF)2 and Tb(1,4-BDC)H2O. The presence of water in the reaction medium in the hydro(solvo)thermal method, provoked the growth of the structure different from that observed in the absence of water. This can be explained by the difference in the coordination mode of water and DMF to lanthanide ions. Although not identified by XRD, the samples prepared with isophthalic acid, also present metalorganic structures, which was confirmed by the presence of the characteristic displacement of the carbonyl group band in their infrared spectra, compared to the spectrum of the pure ligand. This shift was also observed in the samples prepared with terephthalic acid. Thermal analisys shows that the metal organic frameworks do not collapse occurs at a temperature below 430°C.The analysis of scanning electron microscopy suggests that the morphology of powders is highly dependent on the type of heating used, conventional or by microwave.

Estudo da produção eletroquímica de espécies de cloro ativo para tratamento de efluentes sintéticos

The treatment of wastewater is essential to human health. One of the most important steps is the disinfection treatment which uses chlorine to eliminate bacteria as required by environmental agencies. However, the identification of potentially toxic byproducts generated by this method, such as trihalomethanes, has stimulated the development of new alternative disinfection technologies. Among them, heterogeneous photocatalysis, TiO2 photocatalysis and electrochemical disinfection are considered suitable alternatives to the chlorination method. Thus, the present dissertation analyzes the evolution of active chlorine species in a synthetic NaCl solution and it is tested to treat a synthetic solution of the dye Reactive Blue 19 using boron-doped diamond (BDD) and ruthenium oxide (Ti/Ru0.3Ti0.7O2) as anodes. The indirect electrochemical process was discussed in terms of mineralization of the total organic load and percentage of color removal in order to evaluate the applicability of electrochemical technology. Electrochemical experiments were carried out with different current densities (25, 50 and 75 mA.cm-2) during 120 minutes. On the other hand, other important parameter in this study was the influence of the proportion sp3/sp2 on BDD anode on the performance of the evolution of active chlorine species which was investigated by electrolytic techniques (linear polarization), with the intention of determining the related training oxidizing species and consumption energy to chemical or electrochemical reactions. From the results, it can be noted that the BDD electrode showed better efficiency throughout the electrochemical process.

Estudo da produção eletroquímica de espécies de cloro ativo para tratamento de efluentes sintéticos

The treatment of wastewater is essential to human health. One of the most important steps is the disinfection treatment which uses chlorine to eliminate bacteria as required by environmental agencies. However, the identification of potentially toxic byproducts generated by this method, such as trihalomethanes, has stimulated the development of new alternative disinfection technologies. Among them, heterogeneous photocatalysis, TiO2 photocatalysis and electrochemical disinfection are considered suitable alternatives to the chlorination method. Thus, the present dissertation analyzes the evolution of active chlorine species in a synthetic NaCl solution and it is tested to treat a synthetic solution of the dye Reactive Blue 19 using boron-doped diamond (BDD) and ruthenium oxide (Ti/Ru0.3Ti0.7O2) as anodes. The indirect electrochemical process was discussed in terms of mineralization of the total organic load and percentage of color removal in order to evaluate the applicability of electrochemical technology. Electrochemical experiments were carried out with different current densities (25, 50 and 75 mA.cm-2) during 120 minutes. On the other hand, other important parameter in this study was the influence of the proportion sp3/sp2 on BDD anode on the performance of the evolution of active chlorine species which was investigated by electrolytic techniques (linear polarization), with the intention of determining the related training oxidizing species and consumption energy to chemical or electrochemical reactions. From the results, it can be noted that the BDD electrode showed better efficiency throughout the electrochemical process.

A responsabilidade enunciativa em artigos científicos de pesquisadores iniciantes e contribuições para o ensino da produção textual na graduação

This thesis investigates materialization strategies of non-assumption of enunciation responsibility and inscription of an authorial voice in scientific articles produced by initial researchers in Linguistics. The specific focus lays on identify, describe and interpret: i) linguistics marks that assign enunciation responsibility; ii) the positions taken by the first speaker-enunciator (L1/E1) in relation to points of view (PoV) imputed to second enunciators (e2); and iii) the linguistic marks that assign the formulation of themselves' PoV. As a practical deployment, it is proposed to discuss how to teach taking into account text discursive strategies regarding to enunciation responsibility and also authorship in academic and scientific texts. Our research corpus is formed by eight scientific essays and they were selected in a renamed Linguistics scientific magazine which is high evaluated by Qualis/CAPES (Brazil Science Agency). The methodology follows the assumptions of a qualitative research, and an it has such an interpretative basis, even though it takes support in a quantitative approach, too. Theoretically, we based this research on Textual Analysis of Speech and linguistics theories about linguistic enunciation area. The results show two kinds of movements in PoV management: imputation and responsibility. In imputation contexts, the most recursive linguistic marks were reported speech, indirect speech, reported speech with “that”, modalization in reported speech (in enunciation with “according to”, “in agreement with”, “for”), beyond that we see certain points of non-coincidences of speech, specifically the non-coincidence of the speech itself. The way those linguistic marks occur in the text point out three kinds of enunciation positions that are assumed by L1/E1 in relation to PoV of e2: agreement, disagreement and a pseudo neutrality. It was clearly recursive the imputation followed by agreement (explicit or not), this perspective puts other’s voices to defend a speech assumed like own authorship. In speech responsibility contexts, we observed such a formulation of inner PoV that results from theoretical findings undertaken by novice researchers (revealing how he/she interpreted concepts of the theory) or arising from their research data, allowing them to express with more autonomy and without reporting to speeches from e2. Based on those data, we can say that, in text by initial researchers, the authorship is strongly built upon PoV and also dependent from others' words (theory and the scholars quoted there), taking into account that many contexts in which we can observe agreement position, PoV formulations with words taken from e2 and assumed as own words by syntactic integration, the comments about what the other says, the absence of explanations and additions, as well as a data analysis that could show agreement with the theory used to support the work. These results allow us to visualize how initial researcher dialogs with the theoretical enunciation sources he or she takes as support and how he/she displays the status of a subject doing a research and positioning himself/herself as a researcher/author in the scientific field. In assuming the reported speech, when quoting, as a resource that allows the enunciation responsibility and also when doing evidence to the positions of speaker-enunciator in relation do reported PoV, this suggests to a textual-discursive treatment of quoting in academic and scientific text, in a context of teaching that gives attention to the development of communication skills of initial researcher and that can contribute to insert and interact students in the scientific field.

A responsabilidade enunciativa em artigos científicos de pesquisadores iniciantes e contribuições para o ensino da produção textual na graduação

This thesis investigates materialization strategies of non-assumption of enunciation responsibility and inscription of an authorial voice in scientific articles produced by initial researchers in Linguistics. The specific focus lays on identify, describe and interpret: i) linguistics marks that assign enunciation responsibility; ii) the positions taken by the first speaker-enunciator (L1/E1) in relation to points of view (PoV) imputed to second enunciators (e2); and iii) the linguistic marks that assign the formulation of themselves' PoV. As a practical deployment, it is proposed to discuss how to teach taking into account text discursive strategies regarding to enunciation responsibility and also authorship in academic and scientific texts. Our research corpus is formed by eight scientific essays and they were selected in a renamed Linguistics scientific magazine which is high evaluated by Qualis/CAPES (Brazil Science Agency). The methodology follows the assumptions of a qualitative research, and an it has such an interpretative basis, even though it takes support in a quantitative approach, too. Theoretically, we based this research on Textual Analysis of Speech and linguistics theories about linguistic enunciation area. The results show two kinds of movements in PoV management: imputation and responsibility. In imputation contexts, the most recursive linguistic marks were reported speech, indirect speech, reported speech with “that”, modalization in reported speech (in enunciation with “according to”, “in agreement with”, “for”), beyond that we see certain points of non-coincidences of speech, specifically the non-coincidence of the speech itself. The way those linguistic marks occur in the text point out three kinds of enunciation positions that are assumed by L1/E1 in relation to PoV of e2: agreement, disagreement and a pseudo neutrality. It was clearly recursive the imputation followed by agreement (explicit or not), this perspective puts other’s voices to defend a speech assumed like own authorship. In speech responsibility contexts, we observed such a formulation of inner PoV that results from theoretical findings undertaken by novice researchers (revealing how he/she interpreted concepts of the theory) or arising from their research data, allowing them to express with more autonomy and without reporting to speeches from e2. Based on those data, we can say that, in text by initial researchers, the authorship is strongly built upon PoV and also dependent from others' words (theory and the scholars quoted there), taking into account that many contexts in which we can observe agreement position, PoV formulations with words taken from e2 and assumed as own words by syntactic integration, the comments about what the other says, the absence of explanations and additions, as well as a data analysis that could show agreement with the theory used to support the work. These results allow us to visualize how initial researcher dialogs with the theoretical enunciation sources he or she takes as support and how he/she displays the status of a subject doing a research and positioning himself/herself as a researcher/author in the scientific field. In assuming the reported speech, when quoting, as a resource that allows the enunciation responsibility and also when doing evidence to the positions of speaker-enunciator in relation do reported PoV, this suggests to a textual-discursive treatment of quoting in academic and scientific text, in a context of teaching that gives attention to the development of communication skills of initial researcher and that can contribute to insert and interact students in the scientific field.

Estudo da eficiência dos adsorventes de Al2O3 e Fe/Al2O3 para remoção de BTX presente em água contaminada com gasolina

Contamination of groundwater by BTX has been featured in recent decades. This type of contamination is due to small and continuous leaks at gas stations, causing serious problems to public health and the environment. Based on these antecedents, the search for new alternatives for treating contaminated water is shown to be essential. Therefore, this study aimed to evaluate the efficiency of removal of BTX by adsorption processes employing commercial alumina (Al2O3) and alumina supported with iron (Fe/Al2O3) as adsorbents. It was prepared by a in a synthetic gasoline solution and distilled water to simulate an actual sample. Initially, the adsorbents were characterized by techniques XRD, TG / DTG, XRF, FTIR and SEM/EDS, several trials, where he was placed synthetic solution to react in the presence of Al2O3 and Fe/Al2O3 in a closed, mechanical stirring system were performed varying the catalyst concentration 2, 4 and 6 g.L-1 every 0, 10, 30 60, 90 and 120 min, aliquots were taken and brought to analysis by gas chromatography flame ionization with headspace extraction. The results indicated that the absorbent which has higher BTX removal capacity was the Fe/Al2O3 at a concentration of 6 g.L-1, pH = 4 and time of 90 minutes reaction, resulting in an efficiency, resulting in a 86,5% efficiency for benzene removal, for the 95,4% toluene, 90,8% for ɱ,ρ- xylene and 93.7% for the θ-xylenes. Subsequently, we performed a kinetic study of the reactions, the values of experimental adsorption capacity (qe) showed agreement with the values of the theoretical adsorption capacity (qc) to the pseudo-second-order model in the adsorption tests using 2 and 6 gL-1 of Al2O3 and assays using 2, 4 and 6 g.L-1 of Fe/Al2O3. A fact corroborated by the R2 values, thus indicating that the chemical interactions are present in the adsorption mechanisms of BTX.

Síntese, caracterização e estudo da associação em meio aquoso de copolímeros responsivos de carboximetilcelulose-g-Jeffamine®

This thesis presents the synthesis, characterization and study of the associative behaviour in aqueous media of new responsive graft copolymers, based on carboxymethylcellulose as the water-soluble backbone and Jeffamine® M-2070 e Jeffamine® M-600 (commercial polyetheramines) as the thermoresponsive grafts with high cloud point temperatures in water. The synthesis was performed on aqueous medium, by using 1-ethyl-3- (3-(dimethylamino)-propyl)carbodiimide hydrochloride and N-hydroxysuccinimide as activators of the reaction between carboxylategroupsfrom carboxymethylcellulose and amino groups from polyetheramines. The grafting reaction was confirmed by infrared spectroscopy and the grafting percentage by 1H NMR. The molar mass of the polyetheramines was determined by 1H NMR, whereas the molar mass of CMC and graft copolymers was determined by static light scattering. The salt effect on the association behaviour of the copolymers was evaluated in different aqueous media (Milli-Q water, 0.5M NaCl, 0.5M K2CO3 and synthetic sea water), at different temperatures, through UV-vis, rheology and dynamic light scattering. None of the copolymers solutions, at 5 g/L, turned turbid in Milli-Q water when heated from 25 to 95 °C, probably because of the increase in hydrophibicity promoted by CMC backbone. However, they became turbid in the presence of salts, due to the salting out effect, where the lowest cloud point was observed in 0.5M K2CO3, which was attributed to the highest ionic strength in water, combined to the ability of CO3 2- to decrease polymer-solvents interactions. The hydrodynamic radius and apparent viscosity of the copolymers in aqueous medium changed as a function of salts dissolved in the medium, temperature and copolymer composition. Thermothickening behaviour was observed in 0.5M K2CO3 when the temperature was raised from 25 to 60°C. This performance can be attributed to intermolecular associations as a physical network, since the temperature is above the cloud point of the copolymers in this solvent.

Juan Zaragüeta y los orígenes de la Filosofía de la Educación en España: un pedagogo entre dos mundos

Este artículo explora los orígenes institucionales de la Filosofía de la Educación en España a través de la figura de Juan Zaragüeta, primer profesor de esta disciplina en los años treinta en la universidad española. Formado, en parte, en el Instituto Superior de Filosofía de Lovaina, éste vino a representar un vínculo de continuidad, tempranamente truncado, entre los dos mundos en que se desarrolló la institucionalización de la pedagogía antes y después del corte que supuso la guerra civil española. El artículo analiza la presencia de los cursos de Filosofía de la Educación de Zaragüeta en la Sección de Pedagogía de la Universidad de Madrid y la conversión de su contenido en Pedagogía Fundamental. Argumenta que en la base de esta identificación está la renovación de la filosofía tomista y la visión sintética del conocimiento, auspiciada por el cardenal Mercier, que Zaragüeta había vivido en Lovaina, y que, a la larga, le llevará a caracterizar la pedagogía como ciencia social.

Cartografia da Arte

O presente trabalho apresenta as bases teórico-conceituais que fundamentam o processo de construção de um objeto gráfico de comunicação sobre o mercado de arte na contemporaneidade e apresenta o desenvolvimento de sua concretização, assim como seu produto final. Trata-se da elaboração de uma ferramenta de gestão cultural com características cartográficas: A Cartografia do Sistema de Arte na Contemporaneidade – CA, é um objeto de comunicação teórico-imagético sobre o mercado de arte que tem como objetivo comunicar - de forma sintética e sinérgica, rápida, intuitiva e totalizadora - a complexidade desse sistema de arte. O método utilizado para seu desenvolvimento envolveu pesquisa bibliográfica sobre bases teóricas nas áreas de gestão, filosofia, design e comunicação (dentre outras). Envolveu também a elaboração de uma análise sobre os elementos recolhidos, os modos de operação e o estabelecimento de nexos dentro do mercado contemporâneo das artes; além da elaboração de estudos prévios e diretrizes para a construção do objeto comunicacional: Por fim, incluiu o acompanhamento e concretização do projeto em parceria com uma profissional do design. Como produto, foi desenvolvida a CA, um objeto impresso que representa graficamente a estrutura e o funcionamento do sistema. Durante a execução do projeto, identificou-se a possibilidade de construir uma complementação para detalhamento do conteúdo da CA e disponibilizá-lo ao público interessado no sistema do mercado de arte na contemporaneidade, em formato eletrônico, na world wide web, para o qual o mapa direciona seus leitores. Concluiu-se que este é um campo aberto a novos estudos, inovações e empreendimentos e continua-se a acreditar, principalmente agora que adquiriu materialidade, que a CA possa ser útil a estudantes, ao público, aos profissionais das artes e da gestão cultural que desejam conhecer o funcionamento do mercado de arte contemporâneo.

Nuevas prácticas corporales en Educación Física del nivel secundario. Implementación y significación que los docentes le otorgan

El presente escrito expone un proyecto de Tesis de Maestría en Investigación Educativa que se focaliza en nuevas prácticas corporales incluidas como contenido curricular en las clases de Educación Física del nivel secundario del Sistema Educativo de la provincia de Córdoba. Con el propósito de poner a disposición del lector la crítica de la coherencia epistemo-metodológica de lo planteado, contemplando la posibilidad de repensar nuevos interrogantes y alternativas metodológicas; se parte de la premisa que la investigación es una práctica dinámica hacia la superación del conocimiento que necesita de la crítica del colectivo académico para, desde la perspectiva Bourdieuana, ir reconfigurando la pesquisa. Así, en este texto se presenta de manera sintética el problema a abordar en una investigación, con su justificación y relevancia para el campo de la Educación Física, los objetivos del estudio, algunos antecedentes que marcan el estado de la cuestión de esta temática, las previsiones teóricas y la metodología a desarrollar

Nuevas prácticas corporales en Educación Física del nivel secundario. Implementación y significación que los docentes le otorgan

El presente escrito expone un proyecto de Tesis de Maestría en Investigación Educativa que se focaliza en nuevas prácticas corporales incluidas como contenido curricular en las clases de Educación Física del nivel secundario del Sistema Educativo de la provincia de Córdoba. Con el propósito de poner a disposición del lector la crítica de la coherencia epistemo-metodológica de lo planteado, contemplando la posibilidad de repensar nuevos interrogantes y alternativas metodológicas; se parte de la premisa que la investigación es una práctica dinámica hacia la superación del conocimiento que necesita de la crítica del colectivo académico para, desde la perspectiva Bourdieuana, ir reconfigurando la pesquisa. Así, en este texto se presenta de manera sintética el problema a abordar en una investigación, con su justificación y relevancia para el campo de la Educación Física, los objetivos del estudio, algunos antecedentes que marcan el estado de la cuestión de esta temática, las previsiones teóricas y la metodología a desarrollar

Nuevas prácticas corporales en Educación Física del nivel secundario. Implementación y significación que los docentes le otorgan

El presente escrito expone un proyecto de Tesis de Maestría en Investigación Educativa que se focaliza en nuevas prácticas corporales incluidas como contenido curricular en las clases de Educación Física del nivel secundario del Sistema Educativo de la provincia de Córdoba. Con el propósito de poner a disposición del lector la crítica de la coherencia epistemo-metodológica de lo planteado, contemplando la posibilidad de repensar nuevos interrogantes y alternativas metodológicas; se parte de la premisa que la investigación es una práctica dinámica hacia la superación del conocimiento que necesita de la crítica del colectivo académico para, desde la perspectiva Bourdieuana, ir reconfigurando la pesquisa. Así, en este texto se presenta de manera sintética el problema a abordar en una investigación, con su justificación y relevancia para el campo de la Educación Física, los objetivos del estudio, algunos antecedentes que marcan el estado de la cuestión de esta temática, las previsiones teóricas y la metodología a desarrollar

“Yo acojo, tú agrupas, ella compensa”: Análisis comparado de la política de integración del alumnado inmigrante en tres Comunidades Autónomas

Con la Ley Orgánica de Mejora de la Calidad Educativa vuelve a emerger uno de los temas educativos más oportunos: la toma de decisiones en torno a las políticas educativas de atención al alumnado inmigrante. El momento supone una excelente excusa para, desde el prisma que nos ofrece la Educación Comparada, revisar cómo el colectivo de infancia inmigrante ha sido educado desde tres modelos de gestión educativa representados por tres Comunidades Autónomas: Comunidad Valenciana, Cataluña y Andalucía. El artículo se sitúa en el análisis de las medidas que se han articulado en los tres casos como respuesta a su recepción, acogida y escolarización, utilizando una metodología cualitativa basada en el método comparado: en el estudio descriptivo (fase analítica), se realiza una exploración explicativa de las medidas articuladas en torno a las políticas de gestión del alumnado inmigrante, mediante el análisis de contenido de fuentes primarias y secundarias. Con respecto a los resultados, en la fase sintética, tras haber yuxtapuesto los principales criterios que asemejan y también dirimen a los tres modelos, se reconoce cómo las tres Comunidades Autónomas presentan particularidades, fruto de trayectos históricos propios, coyunturas económicas y políticas e intenciones educativas y sociales, influidas por contextos en los que algunos factores han tenido un peso específico importante. Además del protagonismo institucional, se detectan diferencias notables en las medidas concretas adoptadas, pero también coincidencias, como las políticas que apoyan económicamente la lengua de la comunidad autónoma. Finalmente, en la fase de conclusiones comparadas, se plantean una serie de elementos de los que se deberían dotar las Comunidades Autónomas y que se hallan presentes en algunos modelos analizados. La atención a la lengua que porta el alumnado o el cuidado por incluir una educación intercultural en los planes de los centros educativos son dos de las acciones más significativas.

Resíduos da indústria agro-alimentar como possíveis fontes de ácido ferúlico

A indústria agro-alimentar produz anualmente uma grande quantidade de subprodutos, ainda tratados como desperdício. A indústria cervejeira, em particular, está associada à produção de vários resíduos, entre os quais o bagaço de malte, também designado bagaço de cerveja ou dreche. Sendo produzida numa razão de 20 kg por cada 100 litros de cerveja, só na Ilha da Madeira a produção de dreche ultrapassa as 2000 toneladas/ano. O presente trabalho foi realizado com o intuito de estudar a utilização da dreche como material de partida para a extracção de ácido ferúlico, um ácido hidroxicinâmico com elevada bioactividade e aplicações. A caracterização físico-química da dreche permitiu determinar um teor de humidade de aproximadamente 70% e um teor de cinzas de cerca de 3,6%. A distribuição granulométrica da dreche seca, revelou que cerca de 70% das partículas que a constituem têm dimensão entre 1 e 0,25 mm. A extracção com acetona produziu um extracto contendo 5 compostos de natureza fenólica, determinados por LC-MS. A hidrólise alcalina – uma das técnicas que permitem a extracção de compostos como o ácido ferúlico a partir de matrizes lenhocelulósicas – foi estudada em amostras de dreche submetidas a tratamento prévio. O pré-tratamento com ácido diluído demonstrou ser eficiente na extracção do ácido ferúlico a partir da dreche. A extracção em autoclave mostrou ser eficiente na extracção do ácido ferúlico [0,28% (m/m)] e uma simplificação do procedimento posterior à reacção de hidrólise alcalina fez aumentar o rendimento de extracção em cerca de 84%, comparativamente ao procedimento habitual. As condições óptimas de hidrólise alcalina em tubos autopressurizados aconteceram a 120 ºC, por 1,5 horas, num rácio de 20 mL/g e NaOH (1,5%). O processo de purificação do ácido ferúlico extraído por adsorção numa resina sintética resultou em percentagens de adsorção de 90,83% e de dessorção em torno dos 68,70%.