34 documents found, page 1 of 4
Nanocomposite PVDF/TiO<sub>2</sub> Photocatalytic Membranes for Micropollutant ...
Aldana, JC; Pedrosa, M; Silva, Adrian; Joaquim Luís Faria; Acero, JL; Alvarez, PMIn this study, a mixed-matrix method was used to prepare PVDF polymeric membranes with different amounts of TiO2 P25 photocatalyst embedded, which were employed in filtration processes in the presence of UV radiation (LED, peak emission at 375 nm) to eliminate two aqueous micropollutants (MPs) used as model compounds (venlafaxine and metoprolol). The obtained membranes were characterized to gain insights into t...
One-step purification of L-asparaginase from cell extracts using carbon xerogels
Raquel O. Cristóvão; R.A.M. Barros; Teresa P. Marramaque; Gonçalo G. Aguiar; Mafalda R. Almeida; Sónia A.C. Carabineiro; Gabriela B. de PaivaL-asparaginase (ASNase, EC 3.5.1.1) is an enzyme with wide applications in the pharmaceutical sector and food processing industries. It is mainly used as a biotherapeutic for treating Acute Lymphoblastic Leukemia (ALL) and to reduce acrylamide formation in starchy compounds. Despite its relevance, current purification methods for microbial enzymes involve complex and expensive techniques. To overcome this drawb...
Recent Developments and Challenges in the Application of Fungal Laccase for the...
F.F. Magalhães; A.F.S. Pereira; Raquel O. Cristóvão; R.A.M. Barros; Joaquim Luís Faria; Claudia G Silva; M.G. Freire; A.P.M. Tavares<jats:sec> <jats:title>Abstract:</jats:title> <jats:p>According to the European Environment Agency, the textile industry is responsible for 20% of global water pollution due to dyeing and finishing products, thus facing severe environmental challenges. It is essential to design more biocompatible and sustainable treatment processes capable of removing dyes from industrial wastewater to fight this environmental ...
Improved L-Asparaginase Properties and Reusability by Immobilization onto Funct...
Barros, RAM; Raquel O. Cristóvão; Carneiro, IG; Barros, MA; Pereira, MM; Carabineiro, SAC; Freire, MG; Joaquim Luís Faria; Santos Ebinuma, VCEnzyme immobilization can offer a range of significant advantages, including reusability, and increased selectivity, stability, and activity. In this work, a central composite design (CCD) of experiments and response surface methodology (RSM) were used to study, for the first time, the L-asparaginase (ASNase) immobilization onto functionalized carbon xerogels (CXs). The best results were achieved using CXs obta...
The role of added oxidising agents in assisting the photocatalytic treatment of...
Torres-Pinto, A; Fernandes, ART; Claudia G Silva; Joaquim Luís Faria; Silva, AdrianOlive mill wastewaters (OMW) consist of high organic contents and are harmful to aquatic and terrestrial biota. Heterogeneous photocatalysis is a technology that can be operated under mild conditions to remove pollutants in the liquid phase. In the present work, graphitic carbon nitride (g-C3N4, hereafter referred to as GCN) is studied for the first time as a metal-free photocatalyst for OMW treatment. The inte...
Carbon nitride-PVDF photocatalytic membranes for visible-light degradation of v...
Valenzuela, L; Pedrosa, M; Bahamonde, A; Rosal, R; Torres-Pinto, A; Claudia G Silva; Joaquim Luís Faria; Silva, AdrianMetal-free carbon nitride-based membranes were prepared by embedding bulk or exfoliated graphitic carbon nitride (g-C3N4) photocatalysts in a polyvinylidene fluoride (PVDF) matrix. Supported membranes were also fabricated by immobilising these photocatalysts on a polytetrafluoroethylene (PTFE) substrate. The membranes were tested for venlafaxine (VFX) degradation at a feed concentration of 250 mu g L-1 under co...
Selective denitrification of simulated oily wastewater by oxidation using Janus...
Roman, FF; de Tuesta, JLD; Sanches, FKK; Silva, AS; Marin, P; B.F. Machado; Serp, P; Pedrosa, M; Silva, Adrian; Joaquim Luís Faria; Gomes, HTThe intense industrial development has resulted in several consequences for human and environmental health, including the increased discharge of oily products in water bodies. Oily products are widely used in industry, often bearing an associated high cost. Finding alternatives to treat oily wastewater aiming at recovering oily and water phases is an approach allowing recovery of products of economic interest. ...
ChannelCOMB Device for Mesostructured Reactors and Networks of Reactors
Ricardo J. Santos; Cláudia G Silva; Isabel O. Barbosa; Yaidelin A. Manrique; Madalena M. Dias; Joaquim Luís Faria; Margarida S. C .A. BritoChannelCOMB, a consecutive flow distributor, was constructed by additive manufacturing (AM) for experimental validation. The feasibility of using AM was experimentally analyzed for two techniques: stereolithography (tolerance of 50 mu m) and fused deposition modeling (tolerance of 100 mu m). For the best ChannelCOMB configuration, SLA printing shows a maximum of ca. 4 % in flow deviation, while FDM has a maximu...
Application of g-C3N4-PVDF membrane for the photocatalytic degradation of micro...
Nieto Sandoval, J; Torres Pinto, A; Pedrosa, M; Munoz, M; de Pedro, ZM; Claudia G Silva; Joaquim Luís Faria; Casas, JA; Silva, AdrianThe combination of photocatalysis with membrane separation technology allows to mitigate potential membrane fouling while degrading the organic micropollutants in water. This work is focused on the immobilization of a gC3N4 promising photocatalyst, in the form of a g-C3N4-PVDF polymeric membrane, for the elimination of representative pharmaceutical substances from complex water matrices in a continuous flow mod...
3D structured photocatalysts for sustainable H2O2 generation from saccharides d...
Borges, RA; Pedrosa, MF; Manrique, Y.A.; Claudia G Silva; Silva, Adrian; Joaquim Luís Faria; Sampaio, M.J.The possibility of using hydrogen peroxide (H2O2) as a chemical oxidizer or as a green liquid fuel to produce electricity has encouraged both the scientific and industrial communities to investigate green technologies aimed at the sustainability of the production process. In particular, the light-induced synthesis of H2O2 from water and oxygen has attracted significant attention using optical semiconductors.An ...