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Projeto de investigação
Geração susténtavel de energia elétrica por eletrodiálise inversa com novas membranas de troca iónica monovalentes com propriedades ?anti-fouling"
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Publicações
A Study on Biofouling and Cleaning of Anion Exchange Membranes for Reverse Electrodialysis
Publication . Tiago, Gonçalo; Cristóvão, Maria Beatriz; Marques, Ana Paula; Huertas, Rosa; Merino-Garcia, Ivan; Pereira, Vanessa Jorge; Crespo, João Goulão; Velizarov, Svetlozar; LAQV@REQUIMTE; DQ - Departamento de Química; Instituto de Tecnologia Química e Biológica António Xavier (ITQB); MDPI AG
This study covers the modification, (bio)fouling characterization, use, and cleaning of commercial heterogeneous anion exchange membranes (AEMs) to evaluate their feasibility for reverse electrodialysis (RED) applications. A surface modification with poly (acrylic) acid resulted in an improved monovalent perm-selectivity (decreased sulfate membrane transport rate). Moreover, we evaluated the (bio)fouling potential of the membrane using sodium dodecyl sulfate (SDS), sodium dodecyl benzenesulfonate (SDBS), and Aeromonas hydrophila as model organic foulants and a bio-foulant, respectively. A detailed characterization of the AEMs (water contact angle, ion exchange capacity (IEC), scanning electron microscopy (SEM), cyclic voltammetry (CV), and Fourier Transform Infrared (FTIR) spectra) was carried out, verifying that the presence of such foulants reduces IEC and the maximum current obtained by CV. However, only SDS and SDBS affected the contact angle values. Cleaning of the biofouled membranes using a sodium hypochlorite aqueous solution allows for (partially) recovering their initial properties. Furthermore, this work includes a fouling characterization using real surface and sea water matrixes, confirming the presence of several types of fouling microorganisms in natural streams. A lower adhesion of microorganisms (measured in terms of total bacteria counts) was observed for the modified membranes compared to the unmodified ones. Finally, we propose a cleaning strategy to mitigate biofouling in AEMs that could be easily applied in RED systems for an enhanced long-term process performance.
Overview of Membrane Science and Technology in Portugal
Publication . Tomé, Liliana C.; Santos, Diogo M. F.; Velizarov, Svetlozar; Coelhoso, Isabel M.; Mendes, Adélio; Crespo, João G.; de Pinho, Maria Norberta; LAQV@REQUIMTE; DQ - Departamento de Química; MDPI AG
Membrane research in Portugal is aligned with global concerns and expectations for sustainable social development, thus progressively focusing on the use of natural resources and renewable energy. This review begins by addressing the pioneer work on membrane science and technology in Portugal by the research groups of Instituto Superior Técnico—Universidade de Lisboa (IST), NOVA School of Science and Technology—Universidade Nova de Lisboa (FCT NOVA) and Faculdade de Engenharia—Universidade do Porto (FEUP) aiming to provide an historical perspective on the topic. Then, an overview of the trends and challenges in membrane processes and materials, mostly in the last five years, involving Portuguese researchers, is presented as a contribution to a more sustainable water–energy–material–food nexus.
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Entidade financiadora
Fundação para a Ciência e a Tecnologia
Programa de financiamento
9471 - RIDTI
Número da atribuição
PTDC/EQU-EPQ/29579/2017