8 documents found, page 1 of 1
3D-printing bauxite residue/fly ash-containing geopolymers as promising metal s...
Almeida, Mariana M.; Gonçalves, Nuno P. F.; Gameiro, Tânia; Alves, Zélia; Labrincha, João A.; Novais, Rui M.Herein, we demonstrate for the first time the feasibility of employing significant amounts (up to 80 wt%) of unexplored industrial wastes (red mud and biomass fly ash) in the production of highly porous 3D-printed geopolymer lattices envisioned for wastewater treatment applications. This without compromising the mechanical performance of the geopolymers relative to those obtained using commercial precursors. Th...
Impact of pyrolysis heating methods on biochars with enhanced CO2/N2 separation...
Correia, Inês; Ilkaeva, Marina; Castellino, Micaela; Bocchini, Sergio; Novais, Rui M.; Mafra, Luís; Gonçalves, Nuno P. F.; Lourenço, Mirtha A. O.N-doped biochars, derived from chitosan sourced from waste crustaceous shells, were produced via microwave-assisted pyrolysis at temperatures ranging from 400 to 800 °C to enhance CO2 and N2 separation. Their performance was compared with biochars from conventional pyrolysis. Microwave-derived biochars exhibited superior CO2 adsorption capacity at 25 °C and 100 kPa (0.78 – 1.56 mmol g−1) compared to conventiona...
Effective acid mine drainage remediation in fixed bed column using porous red m...
Gonçalves, Nuno P. F.; Almeida, Mariana M.; Labrincha, João A.; Novais, Rui M.Acid mine drainage (AMD) poses a significant threat to water quality worldwide, being amongst the most problematic environmental concerns of the millennium. This work reports for the first time the remediation of real AMD, from a Portuguese abandoned mine, in fixed bed column using porous red mud/fly ash-based geopolymeric spheres. Porous waste-based spheres (2.6 ± 0.2 mm) were obtained by a suspension-solidifi...
Small concentrations, big results: μM addition of photoactive iron oxides with ...
Jia, Jialin; Minella, Marco; Ruiz, Mercedes Cid; Decker, Jeremie; Li, Dong; Gonçalves, Nuno P. F.; Prevot, Alessandra Bianco; Lin, TaoThe photo-Fenton process is effective for pathogen removal, and its low-cost versions can be applied in resource-poor contexts. Herein, a photo-Fenton-like system was proposed using low concentrations of iron oxides (hematite and magnetite) and persulfates (peroxymonosulfate - PMS, and peroxydisulfate - PDS), which exhibited excellent inactivation performance towards MS2 bacteriophages. In the presence of bacte...
From rust to robust disinfectants: How do iron oxides and inorganic oxidants sy...
Jia, Jialin; Minella, Marco; Del Castillo González, Isabel; Lehmann, Aurelio Hernández; Li, Dong; Gonçalves, Nuno P. F.; Prevot, Alessandra BiancoPathogens in drinking water remain a challenge for human health, photo-Fenton process is a promising technique for pathogen inactivation, herein, two common iron oxides, hematite and magnetite mediate persulfate (peroxymonosulfate-PMS - and peroxydisulfate-PDS) involved photo-Fenton-like processes were constructed for E. coli inactivation, and the inactivation performance was investigated and compared with the ...
Simultaneous removal of multiple metal(loid)s and neutralization of acid mine d...
Gonçalves, Nuno P. F.; da Silva, Eduardo Ferreira; Tarelho, Luís A. C.; Labrincha, João A.; Novais, Rui M.The mining industry is one of the largest sources of environmental concern globally. Herein we report for the first time the application of highly porous 3D-printed sorbents containing high amounts (50 wt%) of red mud, a hazardous waste derived from the alumina industry, for the remediation of acid mine drainage (AMD). The sorption capacity of the inorganic polymers was initially evaluated for the simultaneous ...
3D-printed red mud/metakaolin-based geopolymers as water pollutant sorbents of ...
Gonçalves, Nuno P. F.; Olhero, Susana M.; Labrincha, João A.; Novais, Rui M.This work reports a novel management strategy for a hazardous waste derived from the alumina industry, known as bauxite residue or red mud (RM). Herein, and for the first time, RM-containing porous structures were prepared by direct ink writing (DIW) and then used directly to extract methylene blue (MB) from synthetic wastewater. The lattices were prepared using a 50:50 wt% blend between RM and metakaolin (MK)....
Colloidal nanomaterials for water quality improvement and monitoring
Estrada, Ana C.; Daniel-da-Silva, Ana L.; Leal, Cátia; Monteiro, Cátia; Lopes, Cláudia B.; Nogueira, Helena I. S.; Lopes, Isabel; Martins, Maria J.Water is the most important resource for all kind forms of live. It is a vital resource distributed unequally across different regions of the globe, with populations already living with water scarcity, a situation that is spreading due to the impact of climate change. The reversal of this tendency and the mitigation of its disastrous consequences is a global challenge posed to Humanity, with the scientific comm...