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Associate Laboratory for Sustainability and Tecnology in Mountain Regions
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Development of Polyethersulphone Mixed Matrix Zeolite Membranes Functionalized with Ionic Liquids and Deep Eutectic Solvents for CO2 Separation
Publication . Cardoso, Jonathan; Lin, Zhi; Brito, Paulo; Ferreira, Licínio
Mixed matrix membranes (MMM) combine the flexibility of polymers and the strength and durability presented by inorganic solids. In an economically point of view, the advantages of membrane separation are low capital investment and space requirements, high process flexibility and lower energy consumption, helping for a more cost-effective separation process and providing a high separation degree. The molecular sieves based on nano-sized silicoaluminophosphates (SAPO) appear as one of the main materials in MMM for gas separation because the pore size of chabazite (CHA) (0.38 nm) is near the kinetic diameter of gases like H2 (0.29 nm), CO2 (0.33 nm), N2 (0.36 nm), CO (0.37 nm), CH4 (0.38 nm) and reduced crystal size improves the dispersion and decreases interfacial defects. Doping SAPO-34 are intended to increase the potential of these solids. The use of isomorphic substitution by transition metals (Fe, Ni, Co, Mn), results in materials with different acidity that differ from the original SAPO in interactions with other compounds. Besides, the addition of ionic liquids (IL) or Deep Eutectic Solvents (DES) with high affinity and selectivity to CO2, onto the particle surface and then dispersing it in a polymer membrane can enhance the separation characteristics, resulting in better permeation and selectivity properties.
Valorização de resíduos de biomassa para a remoção de estrogénios em matrizes aquosas
Publication . Exposto, Bruno Marques; Queiroz, Ana; Ribeiro, António E.; Brito, Paulo
Os estrogénios são substâncias consideradas disruptores endócrinos, ou seja, têm a capacidade de desregular o sistema endócrino dos seres vivos. Estes compostos podem ocorrer naturalmente, como a estrona (E1) e o estradiol (E2), ou na forma sintetizada, como o etinilestradiol (EE2) [1]. Os efeitos nocivos destes fármacos manifestam-se mesmo em baixas concentrações (µg/L ou ng/L), sendo considerados como micropoluentes [1]. Por outro lado, estas substâncias são consideradas poluentes emergentes devido à sua elevada persistência, sendo encontradas em concentrações sucessivamente crescentes no ambiente [2].
Valorization of oliviculture residues for the removal of estrogens from water
Publication . Milani, Eduardo C.; Menezes, Maraísa L.; Diáz de Tuesta, Jose Luis; Brito, Paulo; Queiroz, Ana; Ribeiro, António E.
Estrogens belong to the class of water micropollutants named as endocrine disrupting chemicals and are considered persistent substances in the environment. Estrogens are a type of hormones that are continuously released into the environment presenting several undesirable effects on aquatic species and human health even when present at very low concentrations (trace levels) [1, 2]. It is also known that traditional sewage and drinking water treatment plants are not able to remove or degrade these compounds and additional treatments are required [3, 4]. Activated carbons (ACs) are low-cost carbonaceous materials with a high surface area. ACs undergo an activation process in order to increase its adsorption performance. Activation can be performed by physical treatment, in which the organic material is thermal treated with an atmosphere of air, CO2, and water vapor, or also by applying some chemical treatments using generally, strong acids, chloride salts or strong bases [5]. As carbon source for ACs preparation, many precursors have been tested, mainly biomass wastes (olive stones, rice husk, coconut shell, among others). According to the Instituto Nacional de Estatística (INE), in 2021, Portugal produced more than 1.3 million tons of olives and it is estimated that more than 500,000 tons of residues were generated per year [6]. Currently, there is an effort to produce bio-based adsorbents that can be used to remove efficiently a wide range of micropollutants from water [7].
Remoção de estrogénios por adsorção: Produção de adsorventes a partir de resíduos de cortiça e estudo cinético
Publication . Exposto, Bruno Marques; Queiroz, Ana; Ribeiro, António E.; Brito, Paulo
Os poluentes emergentes são uma preocupação ambiental crescente no setor industrial. Estes compostos são detetados em concentrações cada vez superiores na natureza devido à sua persistência.1 Muitos poluentes emergentes são também considerados micropoluentes devido à sua perigosidade mesmo em concentrações muito baixas.
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.
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Fundação para a Ciência e a Tecnologia