19 documents found, page 1 of 2
Development of energy-saving innovative hydraulic mortars reusing spent coffee ...
Saeli, Manfredi; Capela, Marinélia N.; Piccirillo, Clara; Tobaldi, David M.; Seabra, M. Paula; Scalera, Francesca; Striani, RaffaellaThis paper reports the development of green bio-composite mortars, obtained reusing spent coffee ground (SCG), an agri-food residue, in the light of the Circular Economy approach. This process can boost the sustainability in Construction and proposes an alternative to SCG disposal in landfill, potentially dangerous to humans and the environment. For the first time, specimens were produced and compared using dif...
Photocatalytic removal of benzene over Ti3C2Tx MXene and TiO2–MXene composite m...
Sergiienko, S.A.; Tobaldi, David M.; Lajaunie, Luc; Lopes, Daniela V.; Constantinescu, Gabriel; Shaula, A.L.; Shcherban, Nataliya D.MXenes, a family of two-dimensional (2D) transition metal carbides, nitrides and carbonitrides based on earth-abundant constituents, are prospective candidates for energy conversion applications, including photocatalysis. While the activity of individual MXenes towards various photocatalytic processes is still debatable, these materials were proved to be excellent co-catalysts, accelerating the charge separatio...
Architectural technologies for life environment: spent coffee ground reuse in l...
Saeli, Manfredi; Capela, Marinélia N.; Campisi, Tiziana; Paula Seabra, M.; Tobaldi, David M.; La Fata, C. ManuelaSpent coffee ground, the residue obtained from the brewing process, is the primary unavoidable (inedible) waste from the coffee consumption. As coffee production and beverage consumption are increasing worldwide, a more sustainable waste management is required since the usual disposal in landfill is a liability to both humans and the environment. This paper is aimed at showing a possible alternative reuse of co...
On the high-temperature degradation mechanism of ZnO-based thermoelectrics
Arias-Serrano, Blanca I.; Mikhalev, Sergey M.; Ferro, Marta C.; Tobaldi, David M.; Frade, Jorge R.; Kovalevsky, Andrei V.The stability and reproducibility of the electric properties in n-type doped ZnO represent known bottlenecks towards potential thermoelectric applications. The degradation is promoted by the vanishing of the electronic defects on oxidation and irreversible exsolution of the phase impurities. This work proposes a microstructural mechanism showing that these processes take place mainly in the pores and highlighti...
Films of chitosan and natural modified hydroxyapatite as effective UV-protectin...
Cunha, Carla S.; Castro, Pedro J.; Sousa, Sérgio C.; Pullar, Robert C.; Tobaldi, David M.; Piccirillo, Clara; Pintado, Maria M.Chitosan is a natural polysaccharide widely used in biomedicine, for instance for wound dressing. Hydroxyapatite is a very bioactive calcium phosphate which, if modified with an appropriate element (iron Fe), can also have UV-absorbing properties. In this work, we report the study of films of chitosan incorporated with iron-modified hydroxyapatite of natural origin (from cod fish bones); this combination led to...
Experimental and computational analysis of NOx photocatalytic abatement using c...
Zhiltsova, Tatiana; Martins, Nelson; Silva, Mariana R. F.; Silva, Carla F. da; Lourenço, Mirtha A. O.; Tobaldi, David M.; Covita, DanielIn the present study, two photocatalytic graphene oxide (GO) and carbon nanotubes (CNT) modified TiO2 materials thermally treated at 300 C (T300_GO and T300_CNT, respectively) were tested and revealed their conversion e ciency of nitrogen oxides (NOx) under simulated solar light, showing slightly better results when compared with the commercial Degussa P25 material at the initial concentration ofNOx of 200 ppb....
Increased UV absorption properties of natural hydroxyapatite-based sunscreen th...
Piccirillo, Clara; Fernández‐Arias, Mónica; Boutinguiza, Mohamed; Tobaldi, David M.; Del Val, Jesus; Pintado, Maria M.; Pou, JuanSunfilters based on hydroxyapatite (HAp) and iron‐containing compounds (Fe2O3 and calcium iron phosphates) are of increasing interest, as they show UV absorption without generating health endanger free radicals (usually observed when other inorganic sunscreens are used). In this paper, laser ablation of solids in liquids has been applied to improve the UV absorption properties of a HAp based Fe‐containing sunsc...
Synergistic effects of zirconium- and aluminum co-doping on the thermoelectric ...
Zakharchuk, Kiryl V.; Tobaldi, David M.; Xiao, Xingxing; Xie, Wenjie; Mikhalev, Sergey M.; Martins, João F.; Frade, Jorge R.; Weidenkaff, AnkeThis work aims to explore zirconium as a possible dopant to promote thermoelectric performance in bulk ZnO-based materials, both within the single-doping concept and on simultaneous co-doping with aluminum. At 1100–1223 K mixed-doped samples demonstrated around ∼2.3 times increase in ZT as compared to single-doped materials, reaching ∼0.12. The simultaneous presence of aluminum and zirconium imposes a synergist...
A sustainable replacement for TiO2 in photocatalyst construction materials: Hyd...
Saeli, Manfredi; Piccirillo, Clara; Tobaldi, David M.; Binions, Russell; Castro, Paula M. L.; Pullar, Robert C.The use of waste materials and by-products in building materials is of increasing importance to improve sustainability in construction, as is the incorporation of photocatalytic materials to both combat atmospheric pollution and protect the structures and façades. This work reports the innovative use of photocatalytic hydroxyapatite (HAp) based powders, derived from Atlantic codfish bone wastes, as an additive ...
A sustainable replacement for TiO2 in photocatalyst construction materials: hyd...
Saeli, Manfredi; Piccirillo, Clara; Tobaldi, David M.; Binions, Russell; Castro, Paula M.L.; Pullar, Robert C.The use of waste materials and by-products in building materials is of increasing importance to improve sustainability in construction, as is the incorporation of photocatalytic materials to both combat atmospheric pollution and protect the structures and façades. This work reports the innovative use of photocatalytic hydroxyapatite (HAp) based powders, derived from Atlantic codfish bone wastes, as an additive ...