Bicarbonate-enhanced transformation of phenol upon irradiation of hematite, nitrate, and nitrite

Chiron, Serge; Barbati, Stephane; Khanra, Swapan; Dutta, Binay K.; Minella, Marco; Minero, Claudio; Maurino, Valter; Pelizzetti, Ezio; Vione, Davide

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저자정보: Chiron, Serge (Laboratoire Chimie Provence, Aix-Marseille Universites-CNRS) Barbati, Stephane (Laboratoire Chimie Provence, Aix-Marseille Universites-CNRS) Khanra, Swapan (Department of Chemical Engineering, University of Calcutta) Dutta, Binay K. (Department of Chemical Engineering, University of Calcutta) Minella, Marco (Dipartimento di Chimica Analitica, Universita di Torino) Minero, Claudio (Dipartimento di Chimica Analitica, Universita di Torino) Maurino, Valter (Dipartimento di Chimica Analitica, Universita di Torino) Pelizzetti, Ezio (Dipartimento di Chimica Analitica, Universita di Torino) Vione, Davide (Dipartimento di Chimica Analitica, Universita di Torino)

저널정보: 한국광과학회 Photochemical & photobiological sciences : an international journal Photochemical & photobiological sciences : an international journal 제8권 제1호

발행연도: 2009.1

수록면: 91 - 100 (10page)

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Bicarbonate enhances the transformation of phenol upon irradiation of hematite, and phenol nitration upon irradiation of both nitrate and nitrite. Hematite under irradiation is able to oxidise the carbonate ion to the ${CO_3}^{-{\cdot}}$ radical, which in turn oxidises phenol to the phenoxyl radical faster compared to the direct photo-oxidation of phenol by hematite. The formation of ${CO_3}^{-{\cdot}}$ from hematite and carbonate under irradiation is supported by the detection of 3,3'-dityrosine from tyrosine, added as a probe for ${CO_3}^{-{\cdot}}$. It is shown that Fe(III) might be an important photochemical source of ${CO_3}^{-{\cdot}}$ in Fe-rich waters, e.g. waters that contain more than 1mg $L^{-1}$ Fe. The enhancement by bicarbonate of phenol nitration upon nitrate irradiation is probably accounted for by an increased photogeneration rate of nitrogen dioxide. The process could lead to enhanced phenol photonitration by nitrate in waters rich of inorganic carbon (>10 mM bicarbonate). Bicarbonate also increases the transformation and nitration rates of phenol upon nitrite photolysis. The effect is due to the combination of basification that enhances phenol nitrosation and nitration, and of peculiar bicarbonate chemistry. It is shown that bicarbonate-enhanced phenol nitration upon nitrite photolysis could be a significant photonitration pathway, leading to the generation of toxic nitrated compounds in natural waters in which the scavenging of hydroxyl radicals by nitrite is competitive with that of Dissolved Organic Matter (DOM).

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Chiron, Serge

소속기관 Laboratoire Chimie Provence, Aix-Marseille Universites-CNRS

주요연구분야 자연과학 > 물리학

논문수 1 이용수 1

Barbati, Stephane

소속기관 Laboratoire Chimie Provence, Aix-Marseille Universites-CNRS

주요연구분야 자연과학 > 물리학

논문수 1 이용수 1

Khanra, Swapan

소속기관 Department of Chemical Engineering, University of Calcutta

주요연구분야 자연과학 > 물리학

논문수 1 이용수 1

Dutta, Binay K.

소속기관 Department of Chemical Engineering, University of Calcutta

주요연구분야 자연과학 > 물리학

논문수 1 이용수 1

Minella, Marco