89,641 research outputs found
DTPA-Functionalized silica-based monoliths for the removal of transition and lanthanide ions from aqueous phase
No full textTransition and rare-earth metals are essential raw materials used in a wide range of technological applications; moreover, their consumption is often associated with high production of wastes. Therefore, their recycling and recovery from end-of-life products or metal-contaminated aqueous environments is of considerable importance from a circular economy perspective. In our study, synthetic mesoporous silica monoliths, obtained by sol-gel synthesis[1] and functionalized with chelating groups are used for the recovery of metal ions from aqueous matrices (MONO-DTPA). The monoliths were characterized using a multi-technique approach and were tested in the recovery of paramagnetic Gd3+, Cu2+ and Co2+ ions from aqueous solutions, using 1H-NMR relaxometry to evaluate their uptake performance in real time and in simple conditions[2]. Detailed information on the kinetics of the capture process was also extrapolated. Finally, the possibility to regenerate the solid sorbents was evaluated. The modified silica monoliths were able to recover an appreciable amount of both di- and trivalent metal ions. The best results were obtained in the case of Cu2+ after 24 hours of contact, with a recovered amount of 0.29 mmol/g corresponding to 18.48 mg/g (Fig. 1, A).
The capture performance of MONO-DTPA has been shown to be superior to that of natural or synthetic materials commonly used for metal ion removal (Fig 1, B).
[1] V. Miglio, C. Zaccone, C. Vittoni, I. Braschi, E. Buscaroli, G. Golemme, L. Marchese and C. Bisio, Molecules 2021, 26, 1316
[2] S. Marchesi, S. Nascimbene, M. Guidotti, C. Bisio and F. Carniato, Dalton Trans. 2022, 51, 4502–4509
«Force the Signory», «Force the People». Patterns of political action in Niccolò Machiavelli's «Florentine Histories»
No full textMachiavelli's Florentine Histories show characteristic transformations concerning his historical and political theory. The origin of the alternatives that this essay tries to account is grounded in a new political practice potentially able to force orders and institutions. As a consequence, Machiavelli outlines an innovative, and peculiarly modern, view of history as a sequence of moments of structuration and destructuration, and not only linear correspondence between action and times
Return to Beginnings and History in Niccolo Machiavelli's Discourses on Livy (III, 1-22)
No full textEven if often qualified as a repetition of the thesis of the first two books, or as a summation of various and scattered considerations, the third book of Machiavelli's Discourses On the First Decade of Titus Livius, and especially it's main topic, the return to the beginnings, represents an important contribution to the political and historical thought of the secretary. Focusing particularly on the problematic relationship between origin and event, this essay tries to account the complex articulation of historical transformation and conservation of orders in Machiavelli's view
Marchesi e altri lettori novecenteschi di Seneca. Proposte per una didattica attuale
No full textLe contraddizioni, evidenti in particolare in alcune opere, come la Consolatio ad Polybium e l'Apocolocyntosis, hanno costituito fin dal '700 un problema per gli studiosi di Seneca. Il lavoro prende in esame alcuni interpreti del '900, a partire dai fondamentali lavori di Concetto Marchesi, per arrivare a letture ideologiche come quelle di M. Zambrano, G. Grass, M. Hubay, G. Papini, che mostrano comunque una rivalutazione novecentesca del moralista di Cordova dallo stile lapidario, citato ad esempio anche da un autore d'aforismi come G. Pontiggia
F. Osborn , Los límites de la Tierra, Traducción de Francisco Aquino, Méjico, Fondo de Cultura Económica, 1956, 198 p.
No full textFil: Marchesi, Estela O..
Universidad Nacional de Cuyo. Facultad de Filosofía y Letra
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