Archivio istituzionale della ricerca - Università degli Studi di Venezia Ca' Foscari
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Strategies for the Transformation of Waste Cooking Oils into High-Value Products: A Critical Review
Full text linkWaste cooking oils (WCOs) are generated globally from households, the hospitality
industry, and other sectors. Presently, WCOs are mainly employed as feedstock
for biodiesel and energy production, strongly depending on the availability of WCOs,
which are often imported from other countries. The objective of this review is to give an
overall comprehensive panorama of the impacts, regulations, and restrictions affecting
WCOs, and their possible uses for producing high-value products, such as bio lubricants,
bio surfactants, polymer additives, road and construction additives, and bio solvents. Interestingly,
many reviews are reported in the literature that address the use of WCOs, but
a comprehensive review of the topic is missing. Published studies, industry reports, and
regulatory documents were examined to identify trends, challenges, production statistics,
environmental impacts, current regulations, and uses for high-value polymer production.
The data collected show that WCOs hold immense potential as renewable resources for
sustainable industrial applications that are in line with global carbon neutrality goals and
circular economy principles. However, achieving this shift requires addressing regulatory
gaps, enhancing collection systems, and optimizing conversion technologies. This
comprehensive review underlines the need for collaborative efforts among policymakers,
industry stakeholders, and researchers to maximize the potential of WCOs and contribute
to sustainable development
Macroscopic and microscopic electron transfer kinetics of HOPG and graphite intercalated compound investigated by cyclic voltammetry and SECM
Full text linkHighly oriented pyrolytic graphite (HOPG) is one of the most used host materials for obtaining and investigating graphite intercalated compounds, because of the high degree structural order of this polycrystal. Experiments on electrochemically intercalated HOPG in sulphuric acid have a model character, as the results obtained can be usefully generalised, not only with respect to other graphite compounds but also for the intercalation of other layered host lattices. In addition, the HOPG/H2SO4 system has an attractive potential for the possibility of electrochemically producing graphite oxide, ideally, by reversible oxidation/reduction cycles, which is of interest for energy storage and graphene production on an industrial scale. However, the oxidation/reduction cycles in such electrochemical intercalation process are not reversible and topotactic, so that the HOPG structure is considerably altered. This alteration may affect, for instance, the quality of the electrochemically produced graphene. In particular, the impact the electrochemical intercalation has on the conductivity of basal planes of HOPG, and so on graphene sheets, is still debated. In this work, we investigated both the macroscopic and microscopic electron transfer (ET) kinetics of the HOPG surface, before and after the intercalation of 1 M H2SO4 to obtain graphite intercalated compound, by using cyclic voltammetry (CV) and scanning electrochemical microscopy (SECM), respectively. The heterogeneous kinetic constant (k0) of the HOPG was evaluated quantitatively by using the redox systems [Fe(CN)6]3–/4– and [Ru(NH3)6]3+/2+. The morphology of the samples was also investigated by atomic force microscopy (AFM), which revealed a widespread formation of blisters and precipitates during the HOPG intercalation process. The CV and SECM results indicate that, upon intercalation, the electrochemical behaviour of the HOPG changes sensibly and the ET decreases sensibly. However, this effect depends on the redox mediators employed and it results more dramatic for the [Fe(CN)6]3–/4– system, for which a decrease of k0 by orders of magnitude was obtained. The decrease of ET can be correlated to the blisters and precipitates, which occur during the HOPG intercalation, as observed by AFM
"Memorial Patterns in the Spanish State Theatre in Times of Democracy"
Full text linkThe article collects some of the most relevant results of the first phase of the project PRIN 2022 Identity Heritage and Cultural Memory. The elaboration of the past through the theatre of democratic Spain (1975 to present), funded by the European Union and the Italian Ministry of University and Research, coordinated by Veronica Orazi (PI). The results shed new light on the perception, conceptualisation, problematisation and/or dramatisation of the process of redefining identity through the recovery of collective memory. To this purpose, the sources –documentary, non-fiction, memoiristic and testimonial, (auto)biographical and (auto)fictional– on which contemporary theatre production on the topic is based have been identified and critically analysed. Then, a significative selection of plays has been studies, edited and in some cases translated for publication
Philosophical Readings - Special Issue: Works in Progress in the History of Science
No full textPhilosophical Readings, online journal, vol. 16, n. 1 (2024): Works in Progress in the History of Science, Special issue edited by Matteo Cosci, with selected proceedings from the Interdisciplinary Workshop "Works in Progress in the History of Science: Challenges and Methodologies", held at the University Ca' Foscari Venice, 23-24 June 2023
From Hemp to CBD Crystals: A Scaled-Up Procedure for the Selective Extraction, Isolation, and Purification of Cannabidiol
Full text linkThe isolation of cannabidiol (CBD) with a purity greater than 99%, while avoiding the presence of Δ9-tetrahydrocannabinol (THC), is essential for both exploring CBD applications and its commercialization. The scientific literature lacks robust and scalable protocols for obtaining pure CBD, instead primarily focusing on obtaining hemp extracts with higher cannabinoid content. Herein, we present a complete procedure for obtaining pure CBD crystals, starting from an industrial hemp cultivar. The protocol includes thermal decarboxylation of cannabinoids, supercritical CO2 extraction, winterization of the extract, CBD purification via sequential C18 reverse-phase silica filtration, silica gel chromatography, and selective crystallization. Each step has been carefully optimized to identify the best solvent, solvent/extract ratio, and silica/extract ratio to minimize CBD loss in waste fractions and to enable solvent and material recovery for recycling, aligning with a sustainable perspective. The scale-up of the procedure to 100-600 g for each step demonstrated the feasibility of our protocol for the obtainment of pure CBD crystals. An overall 52% yield of CBD with a purity exceeding 99% and a negligible THC content was achieved
Labour Exploitation, Gender Violence and Barriers to Reproductive and Sexual Rights: the Experiences of Migrant Women in Italian Agriculture
Full text linkIn recent years, significant research has explored, from both a sociological and legal perspective, the structural nature of labour exploitation and its connections to gender-based violence, with a particular focus on migrant women workers. In line with this perspective, this article examines the interplay between labour exploitation, gender-based violence – including domestic violence – and access to the right to health, particularly sexual and reproductive health. It focuses on the experiences of migrant women employed in the agricultural sector in rural Italy, discussing key theoretical and legal issues related to the concepts of labour exploitation, gender-based violence and reproductive justice. The article sheds light on the pervasive nature of exploitation that extends far beyond the experience of work in the strict sense, deeply permeating many aspects of the living conditions – thus also the health – of women workers, when intertwined with patriar-chal practices and oppressions, as well as various situations of intersectional vulnerability
Lebensraum-Spazio vitale-Seikatsukūkan. Da teoria biogeografica a strumento politico per la definizione di un nuovo ordine
No full textIl saggio analizza l’evoluzione del concetto di Lebensraum in Germania, Italia e Giappone dai primi del Novecento agli anni Quaranta, al fine di ricostruirne le trasformazioni e comprendere i motivi che portarono una teoria biogeografica a diventare, nel corso di quattro decenni, uno degli strumenti adottati dalle potenze dell’Asse nella loro sfida all’ordine globale
Dorsali metropolitane e periferie industriali: uno studio spaziale sui differenziali di competitività regionale nell’Unione Europea
No full textQuesto paper analizza le disparità di produttività e competitività tra le regioni europee. Oltre alla storica dorsale dell’Europa centro-occidentale, la “Banana Blu”, lo studio qui presentato si propone di esaminare le nuove integrazioni urbane in Europa Centro-Orientale, e nei territori Mediterranei dell’UE, evidenziandone le trasformazioni economiche. Assumendo la suddivisione regionale Nuts 2 e i dati provenienti dall’ultimo Regional Competitiveness Index (Rci) dell’UE, lo studio analizza la concentrazione spaziale e demografica dell’Unione. Utilizzando il Modello gravitazionale e le Teorie di Stewart sull’Energia Demografica e il Potenziale di Popolazione, insieme ad analisi di correlazione spaziale, si indaga se la “Banana Blu” mantenga il proprio primato spaziale. I risultati confermano la centralità della dorsale, nonostante l’emergere di nuovi poli competitivi, sottolineando il ruolo chiave delle strategie regionali per ridurre le disuguaglianze e promuovere l’innovazione oltre l’epicentro tradizional
LA SOSTENIBILITA’ AMBIENTALE TRA I PRINCIPI FONDAMENTALI DELLA COSTITUZIONE
No full textAnalisi della introduzione delle tematiche ambientali tra i principi fondamentali dell'ordinamento costituzionale in un'ottica di sviluppo sostenibile. Riforma Articoli 9 e 41 della Costituzione
L’importante è finire? Onegin, (Dostoevskij), Tat’jana e il gioco delle parti
No full textThis essay analyses the final scene of Tchaikovsky's opera Eugene Onegin, highlighting the gender dynamics that emerge between the two protagonists. It then goes on to investigate the reasons behind the changes made by the composer after the premiere, linking them to the socio-cultural context of fin-de-siècle Russia, with particular reference to the impact of the rediscovery of Pushkin and the importance of the speech given by Dostoevsky in Moscow in June 1880 at the inauguration of the monument to Pushkin