145,148 research outputs found
New TiO2 based photocatalysts for the degradation of organic pollutants in water
No full textIn the last years a new category of TiO2 based composites prepared by impregnation of bare polycrystalline TiO2 powders with different sensitizers (i.e. phthalocyanines, porphyrins) permitted the improvement of the photocatalytic degradation of 4-nitrophenol (4-NP) under UV1-3 as well as under visible light irradiation.4 On the other hand growing interest devoted to the photodegradation of organic pollutants in water solutions by means of economically advantageous and environmental friendly processes are regarding this topic.
Continuing our research in this area, we report here our recent results concerning: i) the preparation of new TiO2 and TiO2 based photocatalysts containing Fe and Cu species; ii) improvement of the photodegradation processes and conditions.
1. Mele, G.; Del Sole, R.; Vasapollo, G.; García-López, E.; Palmisano, L.; Schiavello, M. J. Catal. 2003, 217, 334. 2. Mele, G. ; Del Sole, R.; Vasapollo, G.; Marcì, G.; Garcìa-Lòpez, E.; Palmisano, L.; Coronado, J. M.; Hernández-Alonso, M. D.; Malitesta, C.; Guascito, R. J. Phys Chem. B 2005, 109, 12347. 3. Mele, G.; García-López, E.; Palmisano, L.; Dyrda, G.; Słota, R. J. Phys. Chem. C, 2007, 111, 6581. 4. Wang, C.; Li, J.; Mele, G.; Yang, G. M.; Zhang, F. X.; Palmisano, L.; Vasapollo, G. Appl. Catal. B: Environ. 2007, 76, 218
Contaminazione, Coinvolgimento, Impegno. Riflessioni su una ricerca di antropologia medica in contesti urbani affetti da disastri ambientali e sociali provocati dalla lavorazione del cemento-amianto in Italia
No full textThe author reflects on theoretical dilemmas and on her subjective experiences in doing a medical anthropological study that aims to be scientifically valid, practically applied, and socio-politically engaged.
To this purpose, the article discusses data collected in two Italian cities: Bari (southern Italy) in 2009, and Casale Monferrato (northern Italy), in 2012. Both the contexts have been affected by social and environmental disasters related to the presence of two asbestos-cement plants, active until the end of the 1980s: the Fibronit and the Eternit factories, respectively.
First, historical and social contextualization of legislation and epidemiological data about asbestos manufacturing are briefly provided, both for the national and the international settings, in order to better situate the actions of socio-political engagement undertaken by the victims organised into local anti-asbestos social movements whose goals and practices have national and international resonance.
Second, the author offers a general overview of asbestos’ characteristics as a raw material, and of the political-economic dynamics promoting its massive industrial use, despite the fact that biomedical studies have recognised asbestos fibres as cancer causing factors as far back as the 1960s.
Third, the author refers to anthropological and sociological literatures on risk perception and on the disaster’s processes in order to better understand the peculiarities of the asbestos-related disasters.
Lastly, the anthropologist’s engagement with the investigated issues is discussed, and a parallelism between contamination and engagement is offered by looking at a process in which the scientist and the research partners collaborate to promote new knowledge and socio-political changes
Preface
No full textPreface of the book "Heterogeneous Photocatalysis
Relationships with Heterogeneous Catalysis and Perspectives
Special needs and characteristic features of (photo)catalytic reactors with a review of the proposed Solutions
No full textIn the present chapter, the analogies between photocatalytic systems and the systems where the more common thermally activated reactions take place are highlighted. The objective is to propose a unified approach for the analysis and the design, which, however, must take into account how and why photocatalytic reactors differ from reactors with thermal reactions. The necessity of absorbing photons to activate the photocatalytic process adds complexity to the system, but some approaches are presented to simplify the problems and make easier their solution
Full families of generalized interval exchange transformations
No full textWe consider generalized interval exchange transformations, or briefly GIETs, that is bijections of the interval which are piecewise increasing homeomorphisms with finitely many branches. When all continuous branches are translations, such maps are classical interval exchange transformations, or briefly IETs. The well-known Rauzy renormalization procedure extends to a given GIET and a Rauzy renormalization path is defined, provided that the map is infinitely renormalizable. We define full families of GIETs, that is optimal finite dimensional parameter families of GIETs such that any prescribed Rauzy renormalization path is realized by some map in the family. In particular, a GIET and a IET with the same Rauzy renormalization path are semi-conjugated. This extends a classical result of Poincaré relating circle homeomorphisms and irrational rotations
Preface
No full textThis Special Issue of Catalysis Today includes selected papers presented at the 5th European Conference on Solar Chemistry & Photocatalysis: Environmental Applications (SPEA 5). The conference, held from 4th to 8th October 2008, was organized by Leonardo Palmisano and Vincenzo Augugliaro in Palermo (Italy). The 252 delegates (representing 757 authors) who came from many different European and non-European countries delivered four plenary lectures and 49 oral presentations. To emphasise the poster presentation, the 184 posters were briefly introduced by the appropriate Session Chairman before each oral sessions began.
Both oral and poster presentations were divided into the following five topics:
Topic 1: Catalysts and processes for solar light utilization; Topic 2: Photodegradation in gas and liquid systems: catalysts, reaction mechanisms and processes; Topic 3: Photocatalysts developments: preparation, doping and characterization; Topic 4: Novel photocatalytic processes and process assessment; Topic 5: Photocatalysis: from fundamentals to applications
Antonio L. Palmisano e il ruolo dell'antropologia al tempo della globalizzazione
No full textRecensione al libro di A.L. Palmisano, Antropologia post-globale (Pensa editore, Lecce 2016
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