120 documents found, page 1 of 12
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 ...
Impact of photoselective nets on phenolic composition and antioxidant capacity ...
Teixeira, João David; Sousa, Miguel Leão de; Barros, Sílvia Cruz; Parpot, Pier; Almeida, Carina Manuela Fernandes; Silva, Ana SanchesPhenolic compounds in apples provide significant health benefits, including antioxidant, and anti-inflammatory properties. The phenolic profile and content in apples are influenced by genetics, environmental factors, and agricultural practices. Photoselective nets, which are designed to filter specific wavelengths of light, might impact fruit quality and phenolic content. This study aimed to assess the effects ...
Impact of photoselective nets on phenolic compound content in redlum apples
Teixeira, João David; Sousa, Miguel Leão de; Barros, Silvia Cruz; Parpot, Pier; Almeida, Carina Manuela Fernandes; Sanches-Silva, Ana[Excerpt] Photoselective nets are a novel agricultural method for enhancing crop quality by modifying light quality and exposure. First introduced in fruit crops in the 1990s, these nets act as a physical barrier and filter for sunlight, influencing factors like shading, temperature, and frost reduction. This study focused on understanding how these nets affect phenolic compounds in Gala Redlum apples grown und...
Antimicrobial agents based on metal-ion zeolite materials: a multivariate appro...
Guedes, Joana; Gonçalves, Diogo B.; Rodrigues, Catarina F.; Parpot, Pier; Fonseca, A. M.; Almeida Aguiar, Cristina; Neves, Isabel C.Bacteria are susceptible to zeolites doped with metal ions. Although the complete mode of action remains unclear, it is widely accepted that metal ions kill bacteria by inducing the production of reactive oxygen species (ROS), which are detrimental to microbial life processes. In this study, two zeolite structures, MFI and LTA, were selected as hosts for the preparation of various metal-ion zeolite materials, w...
Microbial production of single cell oil from biowaste-derived volatile fatty ac...
Fernandes, Ticiana; Parpot, Pier; Soares-Silva, Isabel; Sousa, Maria João; Franco-Duarte, RicardoEfforts to achieve a circular economy emphasize waste minimization while maximizing its value through recycling and reuse. Volatile Fatty Acids (VFAs), derived from organic waste streams, hold biotechnological potential as raw materials for producing value-added compounds offering sustainable alternatives to traditional petroleum-based approaches. The phenotypic and genomic plasticity of non-Saccharomyces yeast...
Efficient solar-driven degradation of diclofenac in aquatic environments using ...
Tlemcani, Saad Slimani; Fernandes, Ricardo Jorge Cunha; Silva, Ana Rita Pereira; Parpot, Pier; Canle, M.; Pereira, LucianaPhotocatalysis has gained considerable attention for the degradation of hazardous pollutants. In this study, the photocatalytic efficiency of Cu(0.50%)/TiO/Kaolin thin films was evaluated for the removal of diclofenac (DCF), a widely used non-steroidal anti-inflammatory drug, from aquatic environments. The photocatalytic activity of the thin films was assessed in three different water matrices: distilled water ...
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-assisted optimization of drug combinations in zeolite-based de...
Bertão, Ana Raquel; Teixeira, Filipe; Ivasiv, Viktoriya; Parpot, Pier; Almeida Aguiar, Cristina; Fonseca, A. M.; Bañobre-López, Manuel; Baltazar, FátimaTwo independent artificial neural network (ANN) models were used to determine the optimal drug combination of zeolite-based delivery systems (ZDS) for cancer therapy. The systems were based on the NaY zeolite using silver (Ag+) and 5-fluorouracil (5-FU) as antimicrobial and antineoplastic agents. Different ZDS samples were prepared, and their characterization indicates the successful incorporation of both pharm...
Chemical modification of zeolites for the recovery of rare earth elements evalu...
Barros, Óscar José Maciel; Parpot, Pier; Neves, Isabel C.; Tavares, T.Rare earth elements (REE) are a significant group of valuable elements used in diverse and relevant applications in our daily lives. The mining and processing of the original ores, as well as the final wastes disposal, produce wastewater with variable concentrations of REE to be recovered. Sorbent materials like zeolites have been employed in adsorption processes to capture diverse pollutants from wastewater. T...
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...