Claudio Minero - Profile on Academia.edu (original) (raw)

Papers by Claudio Minero

Graphitic carbon nitride-based metal-free photocatalyst

Elsevier eBooks, 2021

Applied Catalysis B-environmental, Mar 1, 2019

p-Type organic semiconductors are attractive to develop new photo-and photoelectro-catalytic syst... more p-Type organic semiconductors are attractive to develop new photo-and photoelectro-catalytic systems, particularly if the conduction band is located at negative redox potentials. An easy synthetic route to produce carbon-doped carbon nitride (C n>3 N 4 ) with a stable p-type semiconducting character was optimized. The precursors used were melamine and triaminopyrimidine. The p-type C >3 N 4 exhibited a remarkable photoactivity under visible light compared with pristine C 3 N 4 , which is a stable n-type organic semiconductor deeply studied as heterogeneous photocatalyst for many environmental applications. The photoelectrochemical features of the synthesized p-type materials and pristine C 3 N 4 were deeply investigated with chronopotentiometry and cyclic voltammetry, in the dark and under different illumination conditions, and then compared with the photocatalytic activity using 2fluorophenol as substrate and different radiation sources. The p-doping with carbon of C 3 N 4 reduces the band gap, slightly moves the potential of the valence band, and increases the conduction band to more positive potentials, thus precluding the application of these materials when large negative redox potentials are needed.

Photocatalytic Selectivity and Transformation Mechanism of Glycerol over Different Titania Catalysts

The 13th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, 2008

Could triplet-sensitized transformation of phenolic compounds represent a source of fulvic-like substances in natural waters

HAL (Le Centre pour la Communication Scientifique Directe), 2013

International audienceHere we show that fluorescent compounds that could be classified as '&#... more International audienceHere we show that fluorescent compounds that could be classified as ''M-like'' (marine-like) fulvic acids are formed upon phototransformation of phenol by a triplet sensitiser (anthraquinone-2-sulphonate, AQ2S). The relevant process most likely involves phenol oxidation to phenoxyl radical by triplet AQ2S, followed by dimerisation of phenoxyl radicals into phenoxyphenols and dihydroxybiphenyls. It might be the first step of an oligomerization process that bears resemblance with the expected formation pathways of humic-like substances (HULIS) in the atmosphere. Such a process could account for the formation in surface waters of compounds having similar fluorescence properties as ''M-like'' fulvic acids. Presently it is thought that such species are formed upon photo-fragmentation of larger humic and fulvic acids (''top-down'' pathway), and we propose that an opposite, ''bottom-up'' pathway could also be operational

Photochemical and photosensitized reaction involving 1-nitronaphthalene and nitrite in aqueous solutions

HAL (Le Centre pour la Communication Scientifique Directe), Jan 3, 2011

International audienceThe excited triplet state of 1-nitronaphthalene, 1NN, (31NN) is able to oxi... more International audienceThe excited triplet state of 1-nitronaphthalene, 1NN, (31NN) is able to oxidise nitrite to ∑NO2, with a second-order rate constant that varies from (3.56 ± 0.11) ¥ 108 M-1 s-1 (m ± s) at pH 2.0 to (3.36 ± 0.28) ¥ 109 M-1 s-1 at pH 6.5. The polychromatic quantum yield of ∑NO2 photogeneration by 1NN in neutral solution is U∑NO2 1NN ≥ (5.7 ± 1.5) ¥ 107 ¥ [NO2 -]/{(3.4 ± 0.3) ¥ 109 ¥ [NO2 -] + 6.0 ¥ 105} in the wavelength interval of 300-440 nm. Irradiated 1NN is also able to produce ∑OH, with a polychromatic quantum yield U∑OH 1NN = (3.42 ± 0.42) ¥ 10-4. In the presence of 1NN and NO2 -/HNO2 under irradiation, excited 1NN (probably its triplet state) would react with ∑NO2 to yield two dinitronaphthalene isomers, 15DNN and 18DNN. The photonitration of 1NN is maximum around pH 3.5. At higher pH the formation rate of ∑NO2 by photolysis of NO2 -/HNO2 would be lower, because the photolysis of nitrite is less efficient than that of HNO2. At lower pH, the reaction between 31NN and ∑NO2 is probably replaced by other processes (involving e.g. 31NN-H+) that do not yield the dinitronaphthalenes

Non Classical Diimine Ligands for Molecular Catalysts Based on VI Group Transition Metals for Electroreduction of CO2

Tailored properties of hematite cool pigments with different size and shape

Influence of nitrogen speciation on the total nitrogen measurement in water by different analytical techniques

Tuning the Photocatalyst Performance through Specific Cation Adsorption

Aromatic nitration processes in the aqueous phase

The effect of fluoride ions and alcohols on the phenol derivatives photocatalyzed degradation rate on titanium dioxide

Diffusion Processes in Amphiphilic Aggregate Systems

Journal of Surface Science and Technology, 1990

The diffusion properties of aggregates of amphiphilic molecules (e.g. micelles, microemulsion) ar... more The diffusion properties of aggregates of amphiphilic molecules (e.g. micelles, microemulsion) are discussed. The interaction of these organized assemblies with water sparingly soluble organic compounds and ions and the consequent influence on the transport of these species is examined as well as their effect on the transfer of solutes through a membrane.

Photomat: tunable materials for application in pollutants removal, SP5- the 5th international conference on semiconductor photochemistry

Assessment of the photochemical fate of carbamazepine in surface waters

La chimica atmosferica dell'acido perossinitroso

Electrochemical characterization of the semiconductor-electrolyte interface in nanocrystalline TiO2 electrodes

Probing the nature of active species in TiO2 photocatalysis by Spin trapping ESR experiments

Modelling the photoreactivity of surface waters: The case of the hydroxyl and carbonate radicals

Trasformazioni del benzene per irradiazione di nitrato di sodio ed ammonio in un fotoreattore gas-solido

Graphitic carbon nitride-based metal-free photocatalyst

Elsevier eBooks, 2021

Applied Catalysis B-environmental, Mar 1, 2019

p-Type organic semiconductors are attractive to develop new photo-and photoelectro-catalytic syst... more p-Type organic semiconductors are attractive to develop new photo-and photoelectro-catalytic systems, particularly if the conduction band is located at negative redox potentials. An easy synthetic route to produce carbon-doped carbon nitride (C n>3 N 4 ) with a stable p-type semiconducting character was optimized. The precursors used were melamine and triaminopyrimidine. The p-type C >3 N 4 exhibited a remarkable photoactivity under visible light compared with pristine C 3 N 4 , which is a stable n-type organic semiconductor deeply studied as heterogeneous photocatalyst for many environmental applications. The photoelectrochemical features of the synthesized p-type materials and pristine C 3 N 4 were deeply investigated with chronopotentiometry and cyclic voltammetry, in the dark and under different illumination conditions, and then compared with the photocatalytic activity using 2fluorophenol as substrate and different radiation sources. The p-doping with carbon of C 3 N 4 reduces the band gap, slightly moves the potential of the valence band, and increases the conduction band to more positive potentials, thus precluding the application of these materials when large negative redox potentials are needed.

Photocatalytic Selectivity and Transformation Mechanism of Glycerol over Different Titania Catalysts

The 13th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, 2008

Could triplet-sensitized transformation of phenolic compounds represent a source of fulvic-like substances in natural waters

HAL (Le Centre pour la Communication Scientifique Directe), 2013

International audienceHere we show that fluorescent compounds that could be classified as '&#... more International audienceHere we show that fluorescent compounds that could be classified as ''M-like'' (marine-like) fulvic acids are formed upon phototransformation of phenol by a triplet sensitiser (anthraquinone-2-sulphonate, AQ2S). The relevant process most likely involves phenol oxidation to phenoxyl radical by triplet AQ2S, followed by dimerisation of phenoxyl radicals into phenoxyphenols and dihydroxybiphenyls. It might be the first step of an oligomerization process that bears resemblance with the expected formation pathways of humic-like substances (HULIS) in the atmosphere. Such a process could account for the formation in surface waters of compounds having similar fluorescence properties as ''M-like'' fulvic acids. Presently it is thought that such species are formed upon photo-fragmentation of larger humic and fulvic acids (''top-down'' pathway), and we propose that an opposite, ''bottom-up'' pathway could also be operational

Photochemical and photosensitized reaction involving 1-nitronaphthalene and nitrite in aqueous solutions

HAL (Le Centre pour la Communication Scientifique Directe), Jan 3, 2011

International audienceThe excited triplet state of 1-nitronaphthalene, 1NN, (31NN) is able to oxi... more International audienceThe excited triplet state of 1-nitronaphthalene, 1NN, (31NN) is able to oxidise nitrite to ∑NO2, with a second-order rate constant that varies from (3.56 ± 0.11) ¥ 108 M-1 s-1 (m ± s) at pH 2.0 to (3.36 ± 0.28) ¥ 109 M-1 s-1 at pH 6.5. The polychromatic quantum yield of ∑NO2 photogeneration by 1NN in neutral solution is U∑NO2 1NN ≥ (5.7 ± 1.5) ¥ 107 ¥ [NO2 -]/{(3.4 ± 0.3) ¥ 109 ¥ [NO2 -] + 6.0 ¥ 105} in the wavelength interval of 300-440 nm. Irradiated 1NN is also able to produce ∑OH, with a polychromatic quantum yield U∑OH 1NN = (3.42 ± 0.42) ¥ 10-4. In the presence of 1NN and NO2 -/HNO2 under irradiation, excited 1NN (probably its triplet state) would react with ∑NO2 to yield two dinitronaphthalene isomers, 15DNN and 18DNN. The photonitration of 1NN is maximum around pH 3.5. At higher pH the formation rate of ∑NO2 by photolysis of NO2 -/HNO2 would be lower, because the photolysis of nitrite is less efficient than that of HNO2. At lower pH, the reaction between 31NN and ∑NO2 is probably replaced by other processes (involving e.g. 31NN-H+) that do not yield the dinitronaphthalenes

Non Classical Diimine Ligands for Molecular Catalysts Based on VI Group Transition Metals for Electroreduction of CO2

Tailored properties of hematite cool pigments with different size and shape

Influence of nitrogen speciation on the total nitrogen measurement in water by different analytical techniques

Tuning the Photocatalyst Performance through Specific Cation Adsorption

Aromatic nitration processes in the aqueous phase

The effect of fluoride ions and alcohols on the phenol derivatives photocatalyzed degradation rate on titanium dioxide

Diffusion Processes in Amphiphilic Aggregate Systems

Journal of Surface Science and Technology, 1990

The diffusion properties of aggregates of amphiphilic molecules (e.g. micelles, microemulsion) ar... more The diffusion properties of aggregates of amphiphilic molecules (e.g. micelles, microemulsion) are discussed. The interaction of these organized assemblies with water sparingly soluble organic compounds and ions and the consequent influence on the transport of these species is examined as well as their effect on the transfer of solutes through a membrane.

Photomat: tunable materials for application in pollutants removal, SP5- the 5th international conference on semiconductor photochemistry

Assessment of the photochemical fate of carbamazepine in surface waters

La chimica atmosferica dell'acido perossinitroso

Electrochemical characterization of the semiconductor-electrolyte interface in nanocrystalline TiO2 electrodes

Probing the nature of active species in TiO2 photocatalysis by Spin trapping ESR experiments

Modelling the photoreactivity of surface waters: The case of the hydroxyl and carbonate radicals

Trasformazioni del benzene per irradiazione di nitrato di sodio ed ammonio in un fotoreattore gas-solido