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Optimizing microwave-assisted production of waste-based activated carbons for t...
Sousa, Érika; Rocha, Luciana; Jaria, Guilaine; Gil, Maria V.; Otero, Marta; Esteves, Valdemar; Calisto, VâniaThis work aimed at the microwave-assisted production of activated carbon (AC) from primary paper mill sludge (PS) for the adsorption of antibiotics from water. Production conditions, namely pyrolysis temperature, pyrolysis time and activating agent (KOH):PS ratio, were optimized as a function of product yield, specific surface area (SBET), total organic carbon (TOC) content and adsorptive removal percentage of ...
Aplicação da fotodegradação no tratamento de efluentes de aquacultura
Silva, Carla Patrícia; Louros, Vitória; Otero, Marta; Calisto, Vânia; Esteves, Valdemar; Lima, DianaSem resumo disponível.
Processes for the elimination of estrogenic steroid hormones from water: a review
Silva, Carla Patrícia; Otero, Marta; Esteves, ValdemarNatural estrogens such as estrone (E1), 17β-estradiol (E2), estriol (E3), and the synthetic one, 17α-ethinylestradiol (EE2), are excreted by humans and animals and enter into environment through discharge of domestic sewage effluents and disposal of animal waste. The occurrence of these substances in aquatic ecosystems may affect the endocrine system of humans and wildlife so it has emerged as a major concern f...
Heavy elements in the phosphorite from Kalaat Khasba mine (North-western Tunisi...
da Silva, Eduardo Ferreira; Mlayah, Ammar; Gomes, Celso; Noronha, Fernando; Charef, Abdelkrim; Sequeira, Cristina; Esteves, ValdemarTunisia is one of the largest phosphate producers in the world (more than 10 million tons per year since the early nineties). The Kalaat Khasba mine (NW of Tunisia) has operated from 1893 until 1993 and data demonstrate that, in the phosphorites of Kalaat Khasba, Cd is enriched 105-208 times, when compared with shales, and U is enriched by a factor varying between 18 and 44. The general trend shows an increase ...