16 documents found, page 1 of 2
From waste to value: electrocatalytic reduction of nitrate into ammonia at mono...
Ferreira, Marta; Kuzniarska-Biernacka, Iwona; Soares, Olívia S. G. P.; Figueiredo, José L.; Pereira, Manuel F. R.; Neves, Isabel C.; Fonseca, A. M.The electrochemical transformation of nitrate ions into ammonia (NH3), which ranks among the most widely employed chemicals globally, using mono (Pd, Pt) and bimetallic catalysts (Pd-Cu, Pt-Cu, Ru-Cu) supported on carbon nanotubes (CNT) was studied in acidic medium. The higher conversion and best selectivity towards NH3 corresponding, respectively, to 88 and 80% were found for Pt_CNT modified electrode, with an...
Desafios e soluções na gestão de águas residuais têxteis: Uma abordagem biológica
Barbosa, Sónia G.; Nicolau, Ana; Silva, Ana R.; Salvador, Andreia Filipa Ferreira; Soares, Olívia S. G. P.; Pereira, Manuel Fernando R.; Gonçalves, AnaOs processos da indústria têxtil consomem grandes volumes de água e geram efluentes resistentes aos processos de tratamento convencionais. Uma gestão eficaz da água requer tecnologias de tratamento que enfrentem a complexidade e variabilidade dos efluentes, assegurando qualidade para reutilização em processos húmidos. Neste estudo testaram-se tratamentos biológicos anaeróbios e aeróbios, suplementados com 2 tip...
Sustainable fluorescent dye-faujasite zeolite systems as tools for cancer bioim...
Bertão, Ana R.; Güney, Orhan; Costa, Marta; Fontão, Patrícia; Martinho, Olga; Costa, Susana P. G.; Fonseca, A. M.; Soares, Olívia S. G. P.The use of fluorescent nanoparticles for biological and medical applications has attracted great attention due to their several advantages compared to conventional fluorescent dyes. However, there is also a need for sustainable and versatile alternatives, alongside the streamlining of complex synthesis or preparations. In this work, we study the potential of the faujasite zeolite structure to encapsulate dye mo...
Optimization of iron-ZIF-8 catalysts for degradation of tartrazine in water by ...
Assila, Ouissal; Vilaça, Natália; Bertão, Ana R.; Fonseca, A. M.; Parpot, Pier; Soares, Olívia S. G. P.; Pereira, Manuel F. R.; Baltazar, FátimaOptimization of iron zeolitic imidazole framework-8 (FeZIF-8) nanoparticles, as heterogeneous catalysts, were synthesized and evaluated by the Fenton-like reaction for to degrade tartrazine (Tar) in aqueous environment. To achieve this, ZIF-8 nanoparticles were modified with different iron species (Fe2+ or Fe3O4), and subsequently assessed through the Fenton-like oxidation. The effect of different parameters su...
Degradation of pollutants in water by Fenton-like oxidation over LaFe-catalysts...
Assila, Ouissal; Barros, Óscar; Fonseca, A. M.; Parpot, Pier; Soares, Olívia S. G. P.; Pereira, Manuel F. R.; Zerrouq, Farid; Kherbeche, AbdelhakThe effect of different parameters such as temperature, type of catalyst and hydrogen peroxide (H2O2) concentration on the degradation of pollutants in water by Fenton-like oxidation was studied by using the Box-Behnken design (BBD), an effective statistical model to design the experiments. Concerning the heterogeneous catalysts, three bimetallic catalysts with lanthanum (La) and iron (Fe) ion-exchanged into ze...
Raw clays from Morocco for degradation of pollutants by Fenton-like reaction fo...
Assila, Ouissal; Bencheqroun, Zineb; Rombi, Elisabetta; Valente, Teresa Maria Fernandes; Braga, Amália S.; Zaitan, Hicham; Kherbeche, AbdelhakThree raw clays from Morocco were used as heterogeneous catalysts for Fenton-like oxidation of organic pollutants in water. The selected pollutants were two dyes used in the textile industry, Congo Red (CR) and Tartrazine (Tar, known also as a food coloring compound, E102) and Caffeine (Caf), a stimulant drug present in popular beverages such as coffee and tea, commonly used in Morocco. Two different processes ...
Fe(III)-exchanged zeolites as efficient electrocatalysts for Fenton-like oxidat...
Bencheqroun, Zineb; Sahin, Nihat E.; Soares, Olívia S. G. P.; Pereira, Manuel F. R.; Zaitan, Hicham; Nawdali, Mustapha; Rombi, ElisabettaElectrochemical oxidation, a powerful tool for the conversion of several of organic dye compounds using metal-exchanged zeolite modified electrodes, has shown great potential due to its capability of high efficiency degradation, a global priority for a sustainable environment. In this study, the role of the Fe(III)-exchanged-zeolite-modified electrodes using two different zeolite structures (such as FAU (Y) and...
Fragrance carriers obtained by encapsulation of volatile aromas into zeolite st...
Costa, Susana P. G.; Soares, Olívia S. G. P.; Almeida Aguiar, Cristina; Neves, Isabel C.Encapsulation of fragrances into porous materials is a technique to preserve or mask the odor of aroma compounds as well as to enhance their thermal and oxidative stability. There is great interest in studying the potential of essential oil-derived fragrance carriers using low-cost materials such as zeolitic structures for healthcare, food, textiles or agricultural applications. Two zeolite structures, faujasit...
Fenton-type bimetallic catalysts for degradation of dyes in aqueous solutions
Santos, Bebiana L. C.; Parpot, Pier; Soares, Olívia S. G. P.; Pereira, Manuel F. R.; Rombi, Elisabetta; Fonseca, António; Neves, Isabel C.Dye compounds are becoming a problematic class of pollutants for the environment, so it is important to develop stable catalysts for their elimination. First, several studies were performed with different Y zeolites (NaY, (NH4)Y and USY) in order to select the best support for the preparation of the bimetallic catalysts. In particular, NaY zeolite was used as the support for Fe, Cu and Mn metals to prepare mono...
Electrochemical oxidation of amoxicillin on carbon nanotubes and carbon nanotub...
Ferreira, Marta; Kuzniarska-Biernacka, Iwona; Fonseca, António; Neves, Isabel C.; Soares, Olívia S. G. P.; Pereira, Manuel F. R.; Figueiredo, José L.The electrolysis of amoxicillin (AMX) was carried out on CNT, Pt/CNT and Ru/CNT modified electrodes based on Carbon Toray in 0.1 M NaOH, 0.1 M NaCl and 0.1 M Na2CO3/NaHCO3 buffer (pH 10) media with the aim of studying the significance of two factors, electrode material and pH, on the oxidative degradation and mineralization of AMX. For this purpose, the electrolysis products were identified by HPLC-MS and GC-MS...