Prisciandaro M.,University of LAquila |
Capocelli M.,The Second University of Naples |
Lancia A.,Universitafederico Ii Of Naples |
Musmarra D.,University of LAquila |
And 3 more authors.
Chemical Engineering Transactions | Year: 2014
The recent regulation policies and an increasing public concern are focusing on the presence of priority and emerging pollutant in water. In order to obtain high efficiencies on their abatement in the prevention and remediation of water sources, the Advanced Oxidation Processes (AOP) are among the most interesting and reliable opportunities. Although they have shown a great potential, their employment in waste water treatment plants is still unsatisfactory mainly because of the elevated treatment cost. A great opportunity is given by hybrid cavitation techniques offering low energy consumption. When applied individually hydrodynamic cavitation (HC), often gives insufficient removal percentage degradation, but its efficacy can be significantly enhanced by combining it with other advanced oxidation processes such as Fenton-like treatments. The research study presents the preliminary results of an experimental campaign with the aim of optimizing the process of hybrid HC oxidation and individuating its feasibility in removing emerging pollutants. This paper focuses on the parallel and combined treatment of HC/Fenton and HC/Activated Persulfate, by evaluating the synergistic index and the energy consumption in the p-nitrophenol (pNP) degradation. Copyright © 2014, AIDIC Servizi S.r.l. Source
Biasiolo L.,University of Udine |
Trinchillo M.,Universitafederico Ii Of Naples |
Belanzoni P.,University of Perugia |
Belpassi L.,CNR Institute of Molecular Science and Technologies |
And 6 more authors.
Chemistry - A European Journal | Year: 2014
The intermolecular alkoxylation of alkynes is the oldest application of cationic gold(I) catalysts; however, no systematic experimental data about the role of the anion are available. In this contribution, the role of the anion in this catalytic reaction as promoted by a N-heterocyclic carbene-based gold catalyst, [(NHC)AuX] (X = BARF- BF4 - , OTf- ,OTs-, TFA- , or OAc- ) is analyzed, through a combined experimental (NMR spectroscopy) and theoretical (DFT calculation) approach. The most important factor seems to be the ability to abstract the proton from the methanol during the nucleophilic attack, and such ability is related to the anion basicity. On the other hand, too high coordination power or basicity of the anion worsens the catalytic performance by preventing alkyne coordination or by forming too much free methoxide in solution, which poisons the catalyst. The intermediate coordinating power and basicity of the OTs- anion provides the best compromise to achieve efficient catalysis. ©2014 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Source
Negri S.,University of Salento |
Margiotta S.,University of Salento |
Maria Quarta T.A.,University of Salento |
Castiello G.,Universitafederico Ii Of Naples |
And 2 more authors.
Journal of Cave and Karst Studies | Year: 2015
In Cutrofiano, in the southern part of the Salento Peninsula, Apulia, Italy, a Pleistocene calcarenitic sequence was quarried by digging extensive networks of galleries along the geological succession most suitable for the quarrying activity. These caves represent a potential hazard for the built-up environment due to the occurrence of underground instability that may propagate upward and eventually reach the surface, causing sinkholes. In this work we propose integrated interdisciplinary methods for cavities detection. The methodology was applied at a test area located along a major road near Cutrofiano using geological and electrical-resistivity tomography and microgravity geophysical methods. © 2015 National Speleological Society Inc. All Rights Reserved. Source