Claudio Minero | Università di Torino (original) (raw)
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Università degli Studi di Milano - State University of Milan (Italy)
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Papers by Claudio Minero
Applied Catalysis B-environmental, Mar 1, 2019
The 13th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, 2008
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
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
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.
Applied Catalysis B-environmental, Mar 1, 2019
The 13th International Conference on TiO2 Photocatalysis: Fundamentals and Applications, 2008
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
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
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.