22 results on '"Marcì, G"'
Search Results
2. Photocatalytic oxidation of cyanide in aqueous TiO2suspensions irradiated by sunlight in mild and strong oxidant conditions
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Augugliaro, V., Blanco Gálvez, J., Cáceres Vázquez, J., García López, E., Loddo, V., López Muñoz, M. J., Sixto Malato, Marcì, G., Palmisano, L., Schiavello, M., and Soria Ruiz, J.
3. Selective photocatalytic oxidation of 5-hydroxymethylfurfural to 2,5-furandicarboxaldehyde by polymeric carbon nitride-hydrogen peroxide adduct
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Leonardo Palmisano, Eva Díaz, Salvador Ordóñez, Giuseppe Marcì, José R. García, Olena Khainakova, Marina Ilkaeva, Elisa I. García-López, Igor Krivtsov, Ilkaeva, M., Krivtsov, I., García-López, E.I., Marcì, G., Khainakova, O., García, J.R., Palmisano, L., Díaz, E., and Ordóñez, S.
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Heptazine ,Carbon nitride ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Peroxide ,Catalysis ,Catalysi ,Adduct ,chemistry.chemical_compound ,Photocatalysi ,Physical and Theoretical Chemistry ,Hydrogen peroxide ,5-Hydroxymethylfurfural ,021001 nanoscience & nanotechnology ,Selective photo-oxidation ,0104 chemical sciences ,chemistry ,2,5-Furandicarboxaldehyde ,Photocatalysis ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,0210 nano-technology ,Carbon - Abstract
Polymeric carbon nitride-hydrogen peroxide adduct (PCN-H2O2) has been prepared, thoroughly characterised and its application for selective photocatalytic conversion of 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxaldehyde (FDC) in aqueous suspension has been studied. The PCN-H2O2 adduct is stable in aqueous suspension under UV and solar irradiation up to 100 °C. It is also stable up to 200 °C if heated in air, while at temperatures close to 300 °C its decomposition takes place. Based on the obtained characterisation data it has been proposed that H2O2 attaches to the non-polymerised carbon nitride species and to the heptazine nitrogen atoms, thus producing strong hydrogen bonding within the PCN-H2O2 adduct. The blockage of the surface amino-groups in PCN-H2O2 by H2O2 hinders the interaction of HMF with these sites, which are responsible for unselective substrate conversion. PCN-H2O2, although being less active, possesses a superior selectivity in natural solar light assisted oxidation of HMF to FDC reaching 80% with respect to its thermally etched PCN counterpart, which gives rise to a 40–50% selectivity. We believe that the exceptional performance of the applied photocatalyst in the selective photocatalytic conversion of HMF to a high added value FDC in a green solvent under natural illumination makes a significant contribution to the development of environmentally friendly technologies for biomass valorisation.
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- 2018
4. Paper-TiO2 composite: An effective photocatalyst for 2-propanol degradation in gas phase
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Michelangelo Gruttadauria, Sami Boufi, Soraa Bouattour, Valeria La Parola, Giuseppe Marcì, Leonarda F. Liotta, Mouheb Sboui, Sboui, M., Bouattour, S., Liotta, L., Parola, V., Gruttadauria, M., Marcì, G., and Boufi, S.
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Paper ,General Chemical Engineering ,Composite number ,General Physics and Astronomy ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Autoclave ,Propanol ,Acetic acid ,chemistry.chemical_compound ,Adsorption ,2-propanol ,TiO2 ,Organic chemistry ,Chemical Engineering (all) ,Sol method ,Sunlight photocatalysis ,Chemistry ,Butanol ,Chemistry (all) ,Hydrothermal method ,Settore CHIM/06 - Chimica Organica ,General Chemistry ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Sunlight photocatalysi ,Chemical engineering ,Photocatalysis ,Degradation (geology) ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,0210 nano-technology - Abstract
Two simple routes for the synthesis of a paper-TiO2 composite were tuned up and the efficiency of the resulting paper-TiO2 photocatalyst was investigated in the 2-propanol oxidation in gas phase. The first route involved the in-situ generation over the sheet of paper of a TiO2 layer starting from a solution of Ti (OBu)4 in tert-butanoliacetic acid, followed by hydrothermal treatment at 120 degrees C for 3 h. The sample was labelled as paper-TiO2 (H). The second approach was based on the adsorption on the paper of a ready-made suspension of titania nanoparticles (TiO2 sol), generated in autoclave at 140 degrees C and stable in acid medium at pH
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- 2018
5. Enhanced (photo)catalytic activity of Wells-Dawson (H6P2W18O62) in comparison to Keggin (H3PW12O40) heteropolyacids for 2-propanol dehydration in gas-solid regime
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Leonardo Palmisano, Francesca Rita Pomilla, Giuseppe Marcì, Leonarda F. Liotta, Elisa I. García-López, Marcì, G., García-López, E., Pomilla, F., Liotta, L., Palmisano, L., Marci, G, Garcia-Lopez, E, Pomilla, F, Liotta, L, and Palmisano, L
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Inorganic chemistry ,02 engineering and technology ,Activation energy ,010402 general chemistry ,01 natural sciences ,Redox ,Catalysis ,Catalysi ,Propene ,Reaction rate ,Propanol ,chemistry.chemical_compound ,2-Propanol dehydration, Heteropolyacid, Keggin, Photocatalysis, Polyoxometalate, Wells-Dawson ,Photocatalysi ,KegginWells ,Wells-Dawson ,2-Propanol dehydration ,Organic chemistry ,Keggin ,Polyoxometalate ,Process Chemistry and Technology ,Heteropolyacid ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,chemistry ,Photocatalysis ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Heteropolyacid Polyoxometalate ,0210 nano-technology ,photocatalysis - Abstract
Catalytic and photocatalytic 2-propanol dehydration to propene at atmospheric pressure and a temperature range of 60–120 °C were carried out in gas-solid regime by using bare and supported Keggin H 3 PW 12 O 40 (PW 12 ) and Wells-Dawson H 6 P 2 W 18 O 62 (P 2 W 18 ) heteropolyacids (HPAs). Binary materials were prepared by impregnation of the HPAs on commercial SiO 2 and TiO 2 . The Wells-Dawson was in any case more active than the Keggin heteropolyacid and the differences were enhanced when the supported samples were used. In particular, Wells-Dawson HPA supported on TiO 2 and under irradiation showed the highest activity. The HPA species played the key role both in the catalytic and photo-assisted reactions. The acidity of the cluster accounts for the catalytic role, whereas both the acidity and the redox properties of the HPA species were responsible for the increase of the reaction rate in the photo-assisted catalytic reaction. The estimated apparent activation energy resulted always lower for the photocatalytic process than for the catalytic one.
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- 2016
6. Photocatalytic formation of H2 and value-added chemicals in aqueous glucose (Pt)-TiO2 suspension
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Giuseppe Marcì, Marianna Bellardita, Elisa I. García-López, Leonardo Palmisano, Bellardita, M., García-López, E., Marcì, G., and Palmisano, L.
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Arabinose ,Formic acid ,Inorganic chemistry ,Partial oxidation ,Energy Engineering and Power Technology ,Condensed Matter Physic ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,Glucaric Acid ,chemistry.chemical_compound ,Photocatalysi ,TiO2 ,Aqueous solution ,Renewable Energy, Sustainability and the Environment ,Brookite ,Fructose ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Glucose ,Fuel Technology ,chemistry ,Erythrose ,visual_art ,H2 ,Gluconic acid ,visual_art.visual_art_medium ,High value chemical ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,0210 nano-technology - Abstract
Commercial and home prepared bare and Pt-supported TiO2 samples were used as the photocatalysts for the aqueous photo-conversion of glucose at ambient pressure and temperature. Aerobic and anaerobic conditions were used to study the products of glucose degradation both in the liquid (arabinose, erythrose, gluconic acid, glucaric acid, fructose and formic acid) and gaseous (H2 and CO2) phases. The distribution of these molecules was different in the presence of the various powders, depending on the structural and physico-chemical properties of the materials, and Pt resulted essential for the anaerobic production of H2. The home prepared samples resulted more active than the commercial ones. The rutile and brookite polymorphs were the most active samples both for glucose conversion and H2 formation (about 1700 μmol of H2 were produced over 7 h of irradiation in the presence of Pt-brookite materials).
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- 2016
7. SrTiO 3 -based perovskites: Preparation, characterization and photocatalytic activity in gas–solid regime under simulated solar irradiation
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Marta Boaro, Bartolomeo Megna, Lidia Armelao, Elisa I. García-López, Giuseppe Marcì, Leonardo Palmisano, Alessandro Trovarelli, Filippo Parisi, García-López, E, Marcì, G, Megna, B, Parisi, F, Armelao, L, Trovarelli, A, Boaro, M, and Palmisano, L
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Propene partial oxidation ,Inorganic chemistry ,chemistry.chemical_element ,Perovskite ,Catalysis ,2-Propanol ,Propene ,chemistry.chemical_compound ,symbols.namesake ,X-ray photoelectron spectroscopy ,Partial oxidation ,Photocatalysis ,Physical and Theoretical Chemistry ,Photodegradation ,Settore CHIM/02 - Chimica Fisica ,integumentary system ,Perovskite, Strontium titanate, Photocatalysis, Propene partial oxidation, 2-Propanol ,Settore ING-IND/22 - Scienza E Tecnologia Dei Materiali ,chemistry ,Strontium titanate ,symbols ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Raman spectroscopy ,Cobalt - Abstract
Strontium titanate-based perovskites have been prepared in the presence of Y and Co with the aim to substitute Sr and Ti, respectively, in the ST crystalline structure. The obtained samples have been characterized by XRD, Raman spectroscopy, FE-SEM, XPS and tested as photocatalysts in two gas-solid regime reactions: (i) 2-propanol complete mineralization and (ii) propene partial oxidation, using a system simulating solar irradiation. All the tested samples resulted active as photocatalysts but with significant differences. The lattice substitution of Sr by Y displays a beneficial effect on the 2-propanol photodegradation. Conversely, the partial presence of cobalt on the ST surface, as Co-oxide nanodispersed clusters with a dominant Co(II) phase, plays a substantial detrimental effect on the photo-degradation process of 2-propanol, but favours the photocatalytic partial oxidation of propene to propene oxide. (c) 2014 Elsevier Inc. All rights reserved.
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- 2015
8. Heteropolyacid-Based Heterogeneous Photocatalysts for Environmental Application
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Leonardo Palmisano, Giuseppe Marcì, Elisa I. García-López, Juan Carlos Colmenares,Yi-Jun Xu, García-López, E., Marcì, G., and Palmisano, L.
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Materials science ,Photocatalysis ,Nanotechnology ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Materials design ,Photocatalysis, heteropolyacid, polyoxometalates, inorganic clusters, semiconductors ,Catalysis - Abstract
Polyoxometalates (POMs) are a wide class of discrete nanosized transition metal–oxygen clusters. The synthesis of POMs has received great interest not only because they present intriguing architectures but also because they have potential applications in catalysis, medicine, electrochemistry, materials design or models for self-assembling nanoscale systems. Recently, POMs have also been studied as green and cheap photocatalysts. The potentialities of POMs are attributed to their unique structural features; indeed, POMs are photostable and non-toxic, have oxygen-rich surfaces and excellent redox properties and possess photochemical characteristics similar to those of the semiconductor photocatalysts. Heteropolyacids (HPAs), including their anions, are a POM subclass. In this chapter their photocatalytic properties when they are immobilized on various supports are described citing a part of the existing literature.
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- 2015
9. Titania Photocatalysts for Selective Oxidations in Water
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Sedat Yurdakal, Vincenzo Augugliaro, Marianna Bellardita, Leonardo Palmisano, Giuseppe Marcì, Elisa Isabel Garcia Lopez, Giovanni Palmisano, Vittorio Loddo, Agatino Di Paola, Palmisano, L, Augugliaro, V, Bellardita, M, Di Paola, A, García López, E, Loddo, V, Marcì, G, Palmisano, G, and Yurdakal,S
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Titanium ,TiO2, photocatalysis, selective oxidations ,Chemistry ,General Chemical Engineering ,Inorganic chemistry ,Water ,Photochemical Processes ,Heterogeneous catalysis ,Hydrocarbons, Aromatic ,Combinatorial chemistry ,Catalysis ,Water Purification ,General Energy ,Alcohols ,Environmental Chemistry ,General Materials Science ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Oxidation-Reduction ,Environmental Restoration and Remediation ,Water Pollutants, Chemical - Abstract
Heterogeneous photocatalysis by polycrystalline semiconductor oxides is an unconventional technology that has been mainly applied for the degradation of organic and inorganic pollutants in both the vapor and liquid phase. The application of photocatalysis in synthetic routes has also been researched in recent years, demonstrating its viability as an alternative route in organic chemistry. This work illustrates the main findings in the application of heterogeneous photocatalysis to the oxidation of organic compounds dissolved in water, free of any organic co-solvent. Two main aspects of the oxidative process have been studied: the first one is the partial oxidation of various mono-substituted aromatic compounds, investigated to better understand the influence of the substituent group on the reactivity of these species and on the distribution of oxidized products. The second aspect investigated is the possibility of using heterogeneous photocatalysis for the selective oxidation of alcohols to aldehydes and ketones. The partial oxidation of alcohols to produce carbonyl compounds is of great industrial importance; generally, it is performed in environmentally harmful organic solvents at high temperatures and pressures by using stoichiometric oxygen donors that not only are expensive and toxic, but also produce large amounts of dangerous waste
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- 2011
10. Zn,Al hydrotalcites calcined at different temperatures: Preparation, characterization and photocatalytic activity in gas–solid regime
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Leonardo Palmisano, Daniel Carriazo, Cristina Martín, Giuseppe Marcì, M. Del Arco, Vicente Rives, Elisa I. García-López, Carriazo, D, Del Arco, M, García López, EI, Marcì, G, Martín, C, Palmisano, L, and Rives, V
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Hydrotalcite ,Chemistry ,Process Chemistry and Technology ,Spinel ,Inorganic chemistry ,Layered double hydroxides ,chemistry.chemical_element ,Zinc ,engineering.material ,Heterogeneous catalysis ,Catalysis ,law.invention ,photocatalysi ,Crystallinity ,ZnAl2O4 ,law ,Layered double hydroxide ,ZnO ,engineering ,Calcination ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Physical and Theoretical Chemistry ,Photodegradation - Abstract
Layered double hydroxides (LDH) containing zinc and aluminium within the brucite-like layers and carbonate as the interlayer anion have been used as precursors for the preparation of mixed metal oxides by calcination. Zinc oxide and the ZnAl 2 O 4 spinel were formed with different degree of crystallinity depending of two parameters, i.e., the Zn 2+ /Al 3+ molar ratio and the calcination temperature (500–800 °C) of the LDH precursor. A pure spinel phase was obtained to remove ZnO upon a basic post-treatment in NaOH solution of the samples calcined at 800 °C. All the samples were tested for the photodegradation of 2-propanol in gas–solid regime. All the samples resulted active as heterogeneous photocatalysts. The photocatalytic activity increased by increasing the Zn 2+ /Al 3+ molar ratio and the calcination temperature of the solids.
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- 2011
11. Tungstophosphoric acid supported on polycrystalline TiO2 for the photodegradation of 4-nitrophenol in aqueous solution and propan-2-ol in vapour phase
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Giuseppe Marcì, Vicente Rives, M. Addamo, Cristina Martín, Leonardo Palmisano, Daniel Carriazo, Carriazo, D, Addamo, M, Marcì, G, Martín, C, Palmisano, L, and Rives, V
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Thermogravimetric analysis ,Aqueous solution ,Chemistry ,Process Chemistry and Technology ,Inorganic chemistry ,Catalysis ,Thermogravimetry ,chemistry.chemical_compound ,Desorption ,Pyridine ,Leaching (metallurgy) ,Photodegradation ,Photocatalysis, Titania, Polyoxometalate, Surface acidity - Abstract
The present work reports the preparation of samples based on Millennium PC-500 TiO 2 loaded with different amounts of tungstophosphoric acid (up to 30% in weight) and their characterisation by means of different physicochemical techniques: powder X-ray diffraction, N 2 adsorption–desorption at −196 °C, transmission electron microscopy, UV–vis and FT-IR spectroscopies and thermogravimetric analyses. The acidity of samples was evaluated by FT-IR using pyridine as probe molecule, and the catalysts activity was tested for the photodegradation of 4-nitrophenol in aqueous solution and for the photo-oxidation of propan-2-ol in vapour phase. The results show a noticeable improvement (8 and 2.5 times faster in the photodegradation rate of 4-nitrophenol and propan-2-ol, respectively), in both regimes for these specific substrates, when tungstophosphoric acid is dispersed over the oxide up to a certain amount (20% in weight). A partial leaching of the polyoxometalate was also detected in solution for samples loaded with the largest amounts on this compound.
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- 2009
12. Total oxidation of propene at low temperature over Co3O4–CeO2 mixed oxides: Role of surface oxygen vacancies and bulk oxygen mobility in the catalytic activity
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L. Retailleau, G. Di Carlo, A. Giroir-Fendler, Leonarda F. Liotta, Giuseppe Marcì, Giuseppe Pantaleo, M. Ousmane, Giulio Deganello, Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC), Liotta, L, Ousmane, M, Di Carlo, G, Pantaleo, G, Deganello, G, Marcì, G, Retailleau, L, and Giroir-Fendler, A
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propene oxidation, Co3O4, CeO2 ,Process Chemistry and Technology ,Inorganic chemistry ,chemistry.chemical_element ,Binary compound ,[CHIM.CATA]Chemical Sciences/Catalysis ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Heterogeneous catalysis ,01 natural sciences ,Oxygen ,Catalysis ,0104 chemical sciences ,Propene ,chemistry.chemical_compound ,chemistry ,Desorption ,Atomic ratio ,0210 nano-technology ,Sodium carbonate - Abstract
Liotta, L. F. Ousmane, M. Di Carlo, G. Pantaleo, G. Deganello, G. Marci, G. Retailleau, L. Giroir-Fendler, A.; Co3O4, CeO2 and Co3O4-CeO2 mixed oxides with Co/Ce nominal atomic ratio 0.1:5, prepared by co-precipitation method with sodium carbonate, were tested in the oxidation of propene under lean condition and the catalyst stability was checked by performing three consecutive heating-cooling cycles. Characterization of the textural properties were performed by surface area measurement BET, X-ray diffraction (XRD) and scanning electron microscopy (SEM) measurements. Among the Co3O4-CeO2 mixed oxides, Co3O4 (30 Wt%)-CeO2 (70 wt%) gives the best activity attaining full propene conversion at 250 degrees C. This sample is characterized by the presence of Co3O4 particles well dispersed and in good contact with ceria according to BET and XRD data and as evidenced by SEM micrographs. Oxygen temperature-programmed desorption (O-2-TPD) and C3H6-temperature-programmed reduction (C3H6-TPR) experiments were carried out in order to study the surface and bulk oxygen mobility and to correlate it to the activity. At temperature around 200 degrees C, O-2-TPD experiments showed the desorption of mobile surface oxygen species for the most active samples, Co3O4 and Co3O4 (30 wt%)-CeO2 (70 wt%). C3H6-TPR experiments for both of the oxides also evidenced a high reactivity at low temperature, especially, for Co3O4 (30 wt%)-CeO2 (70 wt%) giving at 345 degrees C an intense peak of CO2 formation. Conversely, the ceria sample showed by C3H6-TPR much less pronounced oxygen bulk mobility, starting to react with propene above 500 degrees C and forming only CO. In this case, the catalytic activity of ceria was explained in terms of formation of surface oxygen vacancies which are relevant to the propene oxidation in presence of gaseous oxygen. (c) 2008 Elsevier B.V. All rights reserved.
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- 2008
13. Mechanistic aspects of oxalic acid oxidation by photocatalysis and ozonation
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Elisa I. García-López, Giuseppe Marcì, Leonardo Palmisano, MARCÌ, G, GARCÍA-LÓPEZ, E, and PALMISANO, L
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Ozone ,Aqueous solution ,General Chemical Engineering ,Oxalic acid ,Inorganic chemistry ,Photochemistry ,Electrochemistry ,chemistry.chemical_compound ,chemistry ,Homogeneous ,Photocatalysis, TiO2, Oxidation, Oxalic acid ,Titanium dioxide ,Materials Chemistry ,Photocatalysis ,Oxidation rate - Abstract
Oxalic acid has been oxidised in acidic aqueous solutions (pH 3) using photocatalysis and ozonation alone or coupled. The simultaneous presence of ozone, titanium dioxide and near UV irradiation increases the oxidation rate of oxalic acid to values greater than those deriving from the single contributions of photocatalysis and ozonation. In particular in the present paper ozonation alone, heterogeneous photocatalysis and also combined ozonation with heterogeneous photocatalysis have been used for the oxidation of oxalic acid at acidic pH in the presence of TiO2 Degussa P25. A likely mechanism, able to explain both the homogeneous and heterogeneous processes, is discussed.
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- 2008
14. Photoassisted Oxidation of the Recalcitrant Cyanuric Acid Substrate in Aqueous ZnO Suspensions
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Hisao Hidaka, Elisa I. García-López, Giuseppe Marcì, Nick Serpone, García-Lopez, E, Marcì, G, Serpone, N, and Hidaka, H
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Aqueous solution ,Absorption spectroscopy ,Electrospray ionization ,Inorganic chemistry ,Ion chromatography ,Substrate (chemistry) ,Mass spectrometry ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,chemistry.chemical_compound ,General Energy ,Adsorption ,chemistry ,ZnO photocatalyst, cyanuric acid ,Physical and Theoretical Chemistry ,Cyanuric acid - Abstract
The photoassisted oxidative transformation of the highly recalcitrant cyanuric acid was examined in the liquid−solid regime at pH 3 and natural pH 7.5 under UV irradiation in oxygen- and ozone-saturated ZnO suspensions using ZnO as a photomediator. Loss of cyanuric acid was assayed by HPLC UV absorption spectroscopy, whereas intermediates and final products were determined by HPLC ion chromatography (IC), by MS techniques using an electrospray ionization mass spectrometer operated in the negative-ion mode, and by FT-IR spectroscopy. Final reaction products were CO2 gas and NO3- ions. The measure of nitrate in solution quantified the degree of mineralization of the substrate; its concentration in solution was lower than indicated by the loss of cyanuric acid owing to adsorption of the latter to the ZnO surface. Some degree of corrosion of ZnO occurred as evidenced by the quantity of Zn2+ present in acidic and near-neutral aqueous media before and during the photoassisted process. The possible site(s) and m...
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- 2007
15. Genotoxicity of citrus wastewater in prokaryotic and eukaryotic cells and efficiency of heterogeneous photocatalysis by TiO(2)
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Marghereth Saverini, Leonardo Palmisano, Giulia Sciandrello, Giuseppe Marcì, Giuseppe Avellone, Irene Catanzaro, Sergio Indelicato, Saverini, M, Catanzaro,I, Sciandrello, G, Avellone, G, Indelicato, S, Marcì, G, and Palmisano, L
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Citrus ,Chromatography, Gas ,DNA damage ,Biophysics ,PHOTOCATALYSIS, TiO2, GENOTOXICITY ,medicine.disease_cause ,Waste Disposal, Fluid ,Catalysis ,Ames test ,Cell Line ,Terpene ,chemistry.chemical_compound ,Bridged Bicyclo Compounds ,Cricetulus ,Cricetinae ,Cyclohexenes ,medicine ,Animals ,Radiology, Nuclear Medicine and imaging ,Solid Phase Microextraction ,Bicyclic Monoterpenes ,Titanium ,Limonene ,Radiation ,Chromatography ,Photolysis ,Radiological and Ultrasound Technology ,Mutagenicity Tests ,Terpenes ,Comet assay ,Transformation (genetics) ,chemistry ,Wastewater ,Environmental chemistry ,Monoterpenes ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Comet Assay ,Genotoxicity ,Water Pollutants, Chemical ,DNA Damage - Abstract
The presence of (±)α-pinene, (+)β-pinene, (+)3-carene, and R-(+)limonene terpenes in wastewater of a citrus transformation factory was detected and analyzed, in a previous study, by using Solid Phase Micro-extraction (SPME) followed by GC analyses. Purpose of that research was to compare the genotoxic responses of mixtures of terpenes with the genotoxicity of the individual compounds, and the biological effects of actual wastewater. Genotoxicity was evaluated in the Salmonella reversion assay (Ames test) and in V79 cells by Comet assay. Ames tests indicated that the four single terpenes did not induce an increase of revertants frequency. On the contrary, the mixtures of terpenes caused, in the presence of metabolic activation, a highly significant increase of the revertants in TA100 strain in comparison to the control. The Comet assay showed a significant increase in DNA damage in V79 cells treated for 1 h with single or mixed terpenes. Moreover, the actual wastewater was found highly genotoxic in bacterial and mammalian cells. Photocatalytic tests completely photodegraded the pollutants present in aqueous wastewater and the initial high genotoxicity of samples of wastewater collected during the photocatalytic run, was completely lose in 3 h of irradiation.
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- 2011
16. Biological effects and photodegradation by TiO(2) of terpenes present in industrial wastewater
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Giuseppe Marcì, Irene Catanzaro, Giulia Sciandrello, Marghereth Saverini, Leonardo Palmisano, Giuseppe Avellone, Lea Scalici, Catanzaro,I, Avellone,G, Marcì,G, Saverini,M, Scalici,L, Sciandrello, G, and Palmisano,L
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Environmental Engineering ,Chromatography, Gas ,Settore CHIM/10 - Chimica Degli Alimenti ,Health, Toxicology and Mutagenesis ,Industrial Waste ,Catalysis ,Cell Line ,Terpene ,Industrial wastewater treatment ,chemistry.chemical_compound ,Cricetulus ,Cricetinae ,Environmental Chemistry ,Animals ,Water Pollutants ,Photodegradation ,Waste Management and Disposal ,Effluent ,Solid Phase Microextraction ,Titanium ,Limonene ,Chromatography ,Photolysis ,Terpenes ,Terpenes clonogenicassay, Terpenes mutationassay, TiO2 photocatalysis ,Pollution ,Settore BIO/18 - Genetica ,Wastewater ,chemistry ,Environmental chemistry ,Photocatalysis ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Gas chromatography - Abstract
The aim of this work was to study the biological effects of four monoterpenes, i.e. α-pinene, β-pinene, 3-carene and d -limonene present in the wastewater of a citrus transformation factory. The study was carried out by exposing V79 Chinese hamster cells to single terpene or to the mixture of four terpenes at concentrations corresponding to those in the wastewater evaluated by head space solid phase micro extraction and gas chromatography (HS-SPME-GC) analyses. Treatments with single or combined terpenes similarly affected cell vitality, but only the combined treatments induced the 6-thioguanine resistant mutants. Moreover the photocatalytic degradation of the four terpenes was successfully achieved with the photocatalyst TiO 2 Degussa P25 in both the actual effluent and in synthetic solutions.
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- 2010
17. TiO2-Based Photocatalysis for Organic Synthesis
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Tullio Caronna, Vincenzo Augugliaro, Giuseppe Marcì, Agatino Di Paola, Leonardo Palmisano, Giovanni Palmisano, Mario Pagliaro, M. Anpo and P. Kamat, Augugliaro,V, Caronna,T, Di Paola,A, Marcì,G, Pagliaro,M, Palmisano,G, and Palmisano,L
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chemistry.chemical_compound ,TiO2, Photocatalysis, Organic Synthesis ,chemistry ,Hazardous waste ,Final product ,Photocatalysis ,Organic synthesis ,Biochemical engineering ,Raw material ,Efficient energy use - Abstract
A major aim of the contemporary chemistry is to replace old environmentally hazardous processes with new, energy efficient routes allowing to reduce or totally avoid the use and production of harmful chemicals and to maximise the quantity of raw material that ends up in the final product. This chapter gives an account of TiO2-based selective photocatalysis as a green synthetic tool for the production of organics. Some case studies of the most common transformations carried out by means of photocatalytic reactions are illustrated in a midway perspective between photochemistry and organic chemistry.
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- 2010
18. Oxidation of aromatic alcohols in irradiated aqueous suspensions of commercial and home-prepared rutile TiO(2): a selectivity study
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Tullio Caronna, Vittorio Loddo, Vincenzo Augugliaro, Leonardo Palmisano, Giovanni Palmisano, Giuseppe Marcì, Sedat Yurdakal, AUGUGLIARO, V, CARONNA, T, LODDO, V, MARCÌ, G, PALMISANO, G, PALMISANO, L, YURDAKAL, S, and Anadolu Üniversitesi, Fen Fakültesi
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oxidation ,Photochemistry ,Ultraviolet Rays ,Alcohol ,Anisoles ,Aldehyde ,Alcohols, Oxidation, Photocatalysis, Rutile, Selectivity ,Catalysis ,alcohols ,chemistry.chemical_compound ,X-Ray Diffraction ,Organic chemistry ,Reactivity (chemistry) ,chemistry.chemical_classification ,Titanium ,Settore ING-IND/24 - Principi Di Ingegneria Chimica ,Aqueous solution ,photocatalysis ,rutile ,selectivity ,Molecular Structure ,Organic Chemistry ,Water ,General Chemistry ,chemistry ,Benzyl alcohol ,Photocatalysis ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,Selectivity ,Oxidation-Reduction ,Benzyl Alcohol - Abstract
WOS: 000256241700021, PubMed ID: 18398885, The photocatalytic oxidation of benzyl alcohol (BA) and 4-methoxybenzyl alcohol (MBA) has been performed in pure water by using commercial TiO2 samples (Sigma-Aldrich, Merck, Degussa P25) and rutile TiO2 prepared from TiCl, at low temperature. Particular attention has been devoted to the identification of the produced aromatic compounds along with the formed CO,. Oxidation products such as the corresponding aromatic aldehyde and acid, as well as mono- and dihydroxylated aldehydes have been detected. The home-prepared rutile sample showed a marked selectivity towards the formation of the aromatic aldehyde (38 and 60% for BA and MBA, respectively), resulting in a three- to sevenfold improvement relative to commercial samples, with the only byproduct being CO2. This catalyst was found to be the most selective in the formation of aldehyde in water. By using the commercial or the calcined home-prepared samples, many hydroxylated aromatic compounds were detected besides the aldehyde and the acid. This finding points to a higher selectivity performance of the home-prepared rutile relative to the commercial TiO2 samples. Some of the home-prepared samples were also dialysed to check the influence of the presence of Cl- species on catalyst reactivity and selectivity. We have attempted to explain the different reaction rate and selectivity observed for MBA and BA.
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- 2008
19. Efecto de la Fotocatálisis Heterogenea y la Ozonización sobre la Oxidación del Ion Oxalato en Suspensión Acuosa de TiO2
- Author
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AUGUGLIARO, Vincenzo, GARCIA LOPEZ, Elisa Isabel, LODDO, Vittorio, MARCI', Giuseppe, PALMISANO, Leonardo, SCHIAVELLO, Mario, V AUGUGLIARO, GARCIA LOPEZ EI, V LODDO, MARCì, G, L PALMISANO, M SCHIAVELLO, J. M. DOMINGUEZ, E GARCIA-LOPEZ, and MARCI' G
- Published
- 2004
20. Heteropolyacid‐Based Materials as Heterogeneous Photocatalysts
- Author
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Giuseppe Marcì, Elisa I. García-López, Leonardo Palmisano, Marcì, G, Garcia-Lopez, E, and Palmisano, L
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Inorganic Chemistry ,Heterogeneous catalysi ,Chemical engineering ,Photochemistry ,Chemistry ,Polyoxometalates ,Photocatalysis ,Organic chemistry ,Heteropolyacid ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie - Abstract
Heteropolyacids (HPAs) that are often used as heteropolyanions are cheap and stable compounds that have been extensively used as acid and oxidation catalysts as a result of their strong Brønsted acidity and ability to undergo multielectron-transfer reactions. HPAs, which are very soluble in water and polar solvents, have been also used as homogeneous photocatalysts for the oxidation of organic substrates in the presence of oxygen, but their use in heterogeneous systems is by far desirable. Dispersing HPAs onto solid supports with high surface area is useful to increase their specific surface area and hence (photo)catalytic activity. Moreover, owing to the high energy gap between the HOMO and LUMO positions of the HPAs, these compounds are activated only by UV light. Consequently, only less than 5 % of the solar light can be used in photocatalytic reactions, which restricts the practical application of HPAs. This microreview is oriented to describe the reported literature on the use of HPA-based materials as heterogeneous photocatalysts for environmental purposes, that is, for the complete or partial oxidation or reduction of organic molecules.
- Published
- 2014
21. Keggin heteropolyacid H3PW12O40 supported on different oxides for catalytic and catalytic photo-assisted propene hydration
- Author
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Leonarda F. Liotta, Filippo Parisi, Marianna Bellardita, Leonardo Palmisano, S. Sorgues, Giuseppe Marcì, Elisa I. García-López, Christophe Colbeau-Justin, Marcì, G, Garcia-Lopez, E, Bellardita, M, Parisi, F, Colbeau-Justin, C, Sorgues,S, Liotta,LF, and Palmisano, L
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Diffraction ,Diffuse reflectance infrared fourier transform ,Atmospheric pressure ,Surface Properties ,Scanning electron microscope ,Water ,General Physics and Astronomy ,Oxides ,Alkenes ,Photochemical Processes ,Photochemistry ,Catalysis ,Tungsten ,Propene ,chemistry.chemical_compound ,chemistry ,Pressure ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie ,sense organs ,Irradiation ,Keggin heteropolyacid, catalytic propene hydration, photo-assisted propene hydration ,Particle Size ,Physical and Theoretical Chemistry ,Fourier transform infrared spectroscopy - Abstract
Catalytic and catalytic photo-assisted hydration of propene to form 2-propanol in gas–solid regime at atmospheric pressure and 85 1C were carried out by using a heteropolyacid (POM) supported on different oxides. Binary materials were prepared by impregnation of H3PW12O40 on different commercial and home prepared supports (TiO2, SiO2, WO3, ZrO2, ZnO, Al2O3). Some of the composites were active both for catalytic and catalytic photo-assisted reactions. The Keggin type POM was completely and partially degraded, when supported on ZnO and Al2O3, respectively, and these binary solids always resulted as inactive for both catalytic and catalytic photo-assisted reactions. The supported Keggin POM species played a key role both for the catalytic and the photo-assisted catalytic reactions, due to their strong acidity and ability to form strong oxidant species under UV irradiation, respectively. The contemporary presence of heat and UV light improved the activity of almost all POM supported materials. All materials were characterized by X-ray diffraction (XRD), scanning electron microscopy observations (SEM), diffuse reflectance spectroscopy (DRS), determination of the conduction and valence band energy by photovoltage measurements, Fourier transform infrared spectroscopy (FTIR), NH3-TPD experiments and time resolved microwave conductivity (TRMC). Introduction Propene hydration to obtain 2-propanol is a reaction carried out at moderate temperatures (ca. 150–200 1C) and pressure (2MPa) in the presence of an acid catalyst;1 however the realization of this reaction at ambient conditions is of great interest. The use
- Published
- 2013
22. Advances in selective conversions by heterogeneous photocatalysis
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Vincenzo Augugliaro, Leonardo Palmisano, Sedat Yurdakal, Vittorio Loddo, Giovanni Palmisano, Elisa I. García-López, Giuseppe Marcì, Palmisano, G, Garcia Lopez, EI, Marcì, G, Loddo, V, Yurdakal, S, Augugliaro, V, and Palmisano, L
- Subjects
Settore ING-IND/24 - Principi Di Ingegneria Chimica ,Chemistry ,Metals and Alloys ,Nanotechnology ,General Chemistry ,Photochemistry ,Catalysis ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Heterogeneous photocatalysis, selective oxidation, selective reduction ,Hazardous waste ,Materials Chemistry ,Ceramics and Composites ,Photocatalysis ,Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie - Abstract
Selective photocatalytic conversions are offering an alternative green route for replacing environmentally hazardous processes with safe and energy efficient routes. This paper reports the most recent advances in the application of heterogeneous photocatalysis to synthesize valuable compounds by selective oxidation and reduction.
- Published
- 2010
Catalog
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