Biblioteca Digital do IPB
Repositório de Publicações do Instituto Politécnico de Bragança
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Coagulation treatment for olive oil pomace extraction wastewater
Publication . Grabowski, Thais; Martins, Ramiro
The European industry is well-established in the production of olive oil. The valorization of olive pomace by extraction generates pollutant effluent because of waste leaching and processing in these extractor units (OOEIW). The goal of this study was to use the coagulation process to treat OOEIW. The effects of five different coagulants, pH, and flocculant addition were also investigated. Al-2(SO4)(3), FeCl3 and MgCl2 achieved maximum removal of 98% total phenolic compounds (TPh) and 46% chemical oxygen demand (COD). pH had a significant effect on TPh removal with Al-2(SO4)(3). Flocculant addition had little impact on pollutant removal but enhanced sludge appearance. The optimal coagulation conditions were 9 g L-1 Al-2(SO4)(3), pH 7, and 50 mg L-1 Rifloc F45, resulting in the removal of 40% of COD and 80% of TPh.
Solar-driven thermos-photocatalytic methanation over a structured RuO₂:TiO₂/SBA-15 nanocomposite at low temperature
Publication . Paulista, Larissa; Ferreira, A.; Castanheira, B.; Martins, Ramiro; Dolic, M.; Boaventura, Rui; Vilar, Vitor; Silva, Tânia
A new hybrid catalyst composed of mesostructured silica SBA-15 functionalized with TiO2 and further loaded with RuO2 was developed to efficiently promote thermo-photocatalytic CO2 hydrogenation into methane at low temperatures. The catalytic activity was assessed with respect to TiO2:RuO2 loading, catalyst dosage, illumination source (polychromatic sunlight and monochromatic LEDs) and power, [H2]:[CO2] molar ratio, temperature, and catalyst reusability. The best methanation yields were attained for the RuO2(6.4%):TiO2(16.9%)/SBA-15 nanocomposite at 150 ºC, under simulated sunlight (0.21 W) and stoichiometric [H2]:[CO2] molar ratio, reaching: a specific CH4 production rate of 13.6 mmol gcat-1 h-1; 99.8 % selectivity; 96.8 % CO2 conversion (110-min; 40 mL); and apparent photonic efficiency/quantum yield of 39.5 %/42.1 %. Considering only the active RuO2:TiO2 photocatalyst mass (23.3 %), the CH4 production rate increased to 58.6 mmol gactive_cat-1 h-1. Besides, this highly-active photocatalyst featured excellent UV-Vis-IR light absorbance, high surface area, and stability for reuse when moist gas was removed between cycles.
Preparation and characterization of adsorbents from waste biomass for estrogen removal through adsorption
Publication . Exposto, Bruno Marques; Queiroz, Ana; Ribeiro, António E.; Brito, Paulo
The environmental impact associated with socioeconomic development is currently a major challenge [1]. One concern relates to inadequate waste disposal of micropollutants, such as endocrine disruptors, which consist of substances with harmful effects even in very low concentrations (µg/L or ng/L) [2], namely natural estrogenic hormones E1, E2 and E3, and synthetic estrogenic hormone EE2, which chemical structures.
Mining waste as an eco-friendly adsorbent in the removal of industrial basazol 5G dye and incorporation in mortars
Publication . Hawerroth, Mariane; Pereira, Eduardo; Almeida, Lariana; Martins, Ramiro; Pietrobelli, Juliana
The circular economy seeks to better use materials and minimize waste generation. This article evaluated the use of granite rock powder, a mining residue, as an adsorbent for the Basazol Yellow 5G (BY5G) dye and the reuse of the residue generated by the by treating this effluent in construction products. Characterization of the adsorbent material by N2 physisorption indicated a surface area of 1514 m2 g1. Energy-dispersive spectrometry (EDS) and X-ray diffraction (XRD) confirmed the presence of silica in the sample and the absence of amorphous halos. The kinetic study showed a removal of approximately 98% at 298 K, and the pseudo-second-order model obtained the best fit. The adsorption isotherm satisfied the Langmuir model and was consistent with the L-type isotherm. The negative value of the Gibbs energy (DG ) and the positive value of the enthalpy (DH ) indicate that the process is spontaneous and endothermic. The activation energy (Ea) indicates the occurrence of chemical adsorption. The desorption rate was low for the adsorbate, demonstrating the possibility of using residual adsorbent material as a filler in mortar and concrete. The material did not exhibit pozzolanic characteristics and, even after adsorption, it showed favorable results when replacing 10% of the cement with GRP viable for use in civil construction even after the adsorption process
Editorial v13n1
Publication . Fernandes, Tiago; Florêncio, Pedro; Luís, Rita; Cunha, Paulo; Rodovalho, Beatriz
This editorial examines contemporary transformations in the Moving Image, highlighting geographic, social, and media-related displacements that reshape center-periphery dynamics. It presents the thematic dossier “Contemporary ‘Peripheral’ Spaces of the Moving Image”, exploring margins as sites of cultural production, resistance, and visual innovation. Contributions address cinema as a space of political and cultural contestation, transnational perspectives, and community engagement, emphasizing media’s active role in shaping social and symbolic spaces. The editorial also highlights Aniki’s initiatives to foster collaborative research and strengthen academic networks in cinema and media studies.