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

Serge, Chiron and Stephane, Barbati and Swapan, Khanra and Binay K., Dutta and Marco, Minella and Claudio, Minero and Valter, Maurino and Ezio, Pelizzetti and Davide, Vione (2009) Bicarbonate-enhanced transformation of phenol upon irradiation of hematite, nitrate, and nitrite. PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES , 8 (1 ). 91-100 . ISSN 1474-905X

[thumbnail of SAMPLE_PAPER_PDF.pdf] PDF
SAMPLE_PAPER_PDF.pdf
Restricted to Registered users only

Download (12kB)
Official URL: http://apps.isiknowledge.com/full_record.do?produc...

Abstract

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 CO3-center dot radical, which in turn oxidises phenol to the phenoxyl radical faster compared to the direct photo-oxidation of phenol by hematite. The formation of CO3-center dot from hematite and carbonate under irradiation is supported by the detection of 3,3'-dityrosine from tyrosine, added as a probe for CO3-center dot . It is shown that Fe(III) might be an important photochemical source of CO3-center dot in Fe-rich waters, e. g. waters that contain more than 1 mg 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).

Item Type: Article
Impact Factor: Cites in 2009 to articles published in: 2008 = 404 Number of articles published in: 2008 = 178 2007 = 506 2007 = 158 Sum: 910 Sum: 336 Calculation: Cites to recent articles 910 = 2.708 Number of recent articles 336
Uncontrolled Keywords: Biochemistry & Molecular Biology; Biophysics; Chemistry, Physical
Subjects: T Technology > TP Chemical technology
Departments / MOR / COE: Departments > Chemical Engineering
Depositing User: Mr Helmi Iskandar Suito
Date Deposited: 23 Jun 2010 11:11
Last Modified: 19 Jan 2017 08:25
URI: http://scholars.utp.edu.my/id/eprint/2344

Actions (login required)

View Item
View Item