9 documents found, page 1 of 1
Bimetallic-zeolite nanomaterials as catalysts for degradation of azorubine dye ...
Mrabet, Imane El; Santos, Bebiana L. C.; Tanji, Karim; Rombi, Elisabetta; Parpot, Pier; Fonseca, A. M.; Zaitan, Hicham; Neves, Isabel C.Solutions containing equal concentrations of each metal ion pair (Zn/Fe, Co/Fe, Ni/Fe) were simultaneously added to the zeolite NaY using the ion-exchange method. The resulting bimetallic-zeolites were used as heterogeneous catalysts for the Fenton-like reaction for azorubine dye degradation. The optimization of the reaction parameters was assessed using the Box-Behnken design by studying the influence of H2O2 ...
Y and ZSM-5 hierarchical zeolites prepared using a surfactant-mediated strategy...
Ruggiu, Andrea; Carvalho, Ana Paula; Rombi, Elisabetta; Martins, Angela; Rocha, João; Parpot, Pier; Neves, Isabel C.; Cutrufello, Maria GiorgiaDiffusional limitations associated with zeolite microporous systems can be overcome by developing hierarchical zeolites, i.e., materials with a micro- and mesoporous framework. In this work, Y and ZSM-5 zeolites were modified using a surfactant-mediated hydrothermal alkaline method, with NaOH and cetyltrimethylammonium bromide (CTAB). For Y zeolite, after a mild acidic pretreatment, the effect of the NaOH+CTAB ...
Machine learning approach for classification of REE/Fe-zeolite catalysts for fe...
Barros, Óscar José Maciel; Parpot, Pier; Rombi, Elisabetta; Tavares, T.; Neves, Isabel C.Various heterogeneous catalysts based on rare earth elements (REE) and iron supported on zeolites were selected and analyzed using machine learning approaches. REE were used in the preparation of multiple REE/Fe-zeolite catalysts with lanthanum, praseodymium or cerium obtained by ion exchange or impregnation methods, using FAU or MFI structures as supports. The efficiency of these REE/Fe-zeolite catalysts was e...
Acid mine drainage precipitates from mining effluents as adsorbents of organic ...
Oliveira, Marta S. F.; Assila, Ouissal; Fonseca, António; Parpot, Pier; Valente, Teresa; Rombi, Elisabetta; Neves, Isabel C.Acid mine drainage (AMD) is one of the main environmental problems associated with mining activity, whether the mine is operational or abandoned. In this work, several precipitates from this mine drainage generated by the oxidation of sulfide minerals, when exposed to weathering, were used as adsorbents. Such AMD precipitates from abandoned Portuguese mines (AGO, AGO-1, CF, and V9) were compared with two raw ma...
NiCu-exchanged hierarchical Y and ZSM5 zeolites for the electrochemical oxidati...
Ruggiu, Andrea; Parpot, Pier; Neves, Isabel C.; Carvalho, Ana Paula; Cutrufello, Maria Giorgia; Fonseca, António; Martins, Angela; Rombi, ElisabettaTwo hierarchical Y and ZSM5 zeolites were prepared with a surfactant-mediated desilication method. Both the conventional and hierarchical forms were used to prepare NiCu-zeolites via the ion-exchange method. All samples were characterised using different techniques. For the hierarchical materials, N2 physisorption and TEM analyses confirmed the appearance of mesoporosity. Transition metal-containing zeolites we...
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...
Metal ionzeolite materials against resistant bacteria, MRSA
Peixoto, Patrícia; Guedes, Joana F.; Rombi, Elisabetta; Fonseca, António; Almeida Aguiar, Cristina; Neves, Isabel C.Metal ionzeolite materials based on different zeolite structuresFAU (NaY, 100750 nm), LTA (4400 nm), and MFI (ZSM5, >100, 760, and 2500 nm) were studied for developing antimicrobial agents using a simple method. These zeolite structures were loaded with silver, copper, or zinc ions using an ion-exchange method and tested for antimicrobial activity against three bacteriaEscherichia coli, methicillin-sensitive St...
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...