35 documents found, page 1 of 4
Recovery of Nd3+ and Dy3+ from E-Waste Using Adsorbents from Spent Tyre Rubbers...
Nogueira, Miguel; Matos, Inês; Bernardo, Maria; Pinto, Filomena; Fonseca, Isabel Maria; Lapa, NunoABSTRACT: This paper investigates the use of spent tyre rubber as a precursor for synthesising adsorbents to recover rare earth elements. Through pyrolysis and CO2 activation, tyre rubber is converted into porous carbonaceous materials with surface properties suited for rare earth element adsorption. The study also examines the efficiency of leaching rare earth elements from NdFeB magnets using optimised acid l...
Enhancing anaerobic co-digestion of municipal mixed sludge with fruit and veget...
Azevedo, André; Moldão, Margarida; Duarte, Elizabeth; Lapa, NunoAnaerobic digestion is widely used to treat organic waste from the food industry and municipal wastewater treatment plants, converting organic matter into biogas. However, mono-digestion of municipal mixed sludge (a blend of primary and secondary sludge) faces challenges due to an imbalanced carbon-to‑nitrogen (C/N) ratio. Co-digestion has been proposed to address this issue, and fruit and vegetable waste provi...
3D electrochemical cork granule process for the removal of pharmaceuticals from...
Remor, Paula V.; Soares, Cristina; Correia-Sá, Luísa; Paíga, Paula; Alves, Ana Rita; Pizzaia, Anita; Lapa, Nuno; Surra, Elena; Moreira, Francisca C.This study evaluates a three-dimensional (3D) electrochemical process employing cork granules as particle electrodes for removing contaminants of emerging concern (CECs) from urban wastewater. Tests in two reactors of different dimensions (Reactor A - 150 mL; Reactor B - 750 mL), with and without spiking of sulfamethoxazole (SMX) and trimethoprim (TMP), were performed and compared with the conventional 2D proce...
Opportunities and Constraints of the Adsorption of Rare Earth Elements onto Pyr...
Nogueira, Miguel; Bernardo, Maria; Ventura, Márcia; Matos, Inês; Pinto, Filomena; Lapa, NunoABSTRACT: Rare earth elements (REEs), comprising seventeen metallic elements, including lanthanides, scandium, and yttrium, are indispensable for modern technological industries due to their unique properties. However, their supply is critically risky for the European Union, with 95% of global production concentrated in China, Brazil, Vietnam, Russia, India, and Australia. This mini-review examines the adsorpti...
Microalgae as a selenium vehicle for nutrition: a review
Pires, Rita; Costa, Margarida; Pereira, Hugo; Cardoso, Helena; Ferreira, Luís; Lapa, Nuno; Silva, Joana; Ventura, MárciaSelenium (Se) is essential for human and animal nutrition, playing a key role in antioxidant and immune functions. Organic Se is better for supplementation because it is more efficiently assimilated and less toxic than its inorganic form. Due to the scarcity of Se in European soils, supplementation in feed and food is necessary. Currently, inorganic Se (sodium selenite and selenate) and organic Se in Se-enriche...
Bioreactor Feeding Strategies to Improve Biogas Production and Pig Slurry Manag...
Silva, Inês; Lapa, Nuno; Ribeiro, Henrique; Duarte, ElizabethPig slurry (PS) management is a challenge that needs appropriate strategies. Anaerobic digestion (AD) has proved to be an interesting option to follow when it comes to livestock effluent management. Although this technology is well established, it is crucial to investigate different scenarios that demonstrate its suitability to motivate farmers to adopt new strategies for PS management. Previous research, based...
Valorisation of spent tire rubber as carbon adsorbents for Pb(II) and W(VI) in ...
Bernardo, Maria; Lapa, Nuno; Pinto, Filomena; Nogueira, Miguel; Matos, Inês; Ventura, Márcia; Ferraria, Ana Maria; Rego, Ana Maria Botelho doABSTRACT: Spent tire rubber-derived chars and their corresponding H3PO4 and CO2-activated chars were used as adsorbents in the recovery of Pb(II) ion and (W(VI)) oxyanion from synthetic solutions. The developed chars (both raw and activated) were thoroughly characterized to have insight about their textural and surface chemistry properties. H3PO4-activated chars presented lower surface areas than the raw chars ...
BioH2 from Dark Fermentation of OFMSW: Effect of the Hydraulic Retention Time a...
Martins, Inês; Surra, Elena; Ventura, Márcia; Lapa, NunoFood wastes represent one third of all food produced worldwide. It is crucial to both prevent the production of food waste and recover the wasted fraction with the aim to valorizing it. In this context, the conversion of the organic fraction of municipal solid wastes (OFMSW) into bioH2 by dark fermentation (DF) is an important technology to valorize these wastes into renewable fuel. Nevertheless, the DF of OFMS...
Evaluation of activated carbons produced from Maize Cob Waste for adsorption-ba...
Surra, Elena; Ribeiro, Rui P.P.L.; Santos, Tiago; Bernardo, Maria; Mota, José P.B.; Lapa, Nuno; Esteves, Isabel A.A.C.Two activated carbons (AC) resulting from CO2 activation of Maize Cob Waste (MCW) were investigated as adsorbent materials for biogas upgrading to bio-methane applying a biorefinery concept. The porous carbons were originated from different times of activation and the one resulting from 3 h with CO2 (MCW(PA)3 h) showed better textural properties, higher working capacity, and selectivity towards CO2 than the car...
Advantages of structural inspection and diagnosis for traditional buildings’ re...
Silva, Renata; Surra, Elena; Quelhas, Bruno; Costa, Alexandre A.; Lapa, Nuno; Delerue-Matos, CristinaThis work demonstrated, through Life Cycle Assessment (LCA), the environmental advantages brought by the application of the Structural Inspection and Diagnosis (SID) methodology to the structural refurbishment of 7 traditional buildings located in the city of Porto (Portugal), when compared to the common total demolition and reconstruction approach. The early diagnosis of the conservation state of the existing ...