Phenol photonitration upon UV irradiation of nitrite in aqueous solution II: effects of pH and TiO2.
Phenol photonitration and photonitrosation were studied both in homogeneous and in heterogeneous phase in the presence of TiO2 particles. The effect of pH as well as of the semiconductor particles on the kinetics and products of the reaction was observed. Formation of nitrophenols is enhanced at acidic pH, due to thermal processes initiated by nitrous acid, as well as in the presence of TiO2, due to the photocatalytic oxidation of nitrite.
Vione
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Dipartimento di Chimica Analitica, Università di Torino, Italy.
Maurino
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Minero
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Pelizzetti
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D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009573:Nitrites / Q000737:chemistry*; D009596:Nitrophenols / Q000737:chemistry*; D010084:Oxidation-Reduction; D010777:Photochemistry; D012666:Semiconductors; D013696:Temperature; D014025:Titanium / Q000737:chemistry*; D014874:Water Pollutants, Chemical
D004396:Coloring Agents; D009573:Nitrites; D009596:Nitrophenols; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium