title: Photodegradation of 1-nitropyrene in solution and in the adsorbed state.
abstract: The photodegradation of the 1-nitropyrene (NPy) has been studied using conventional (Xe and medium pressure Hg lamps) and laser sources (XeCl excimer and Nd-YAG UV). Low energy monochromatic light sources were used to study the early stages of degradation (up to 50% conversion). The medium pressure Hg lamp was used for longer periods of irradiation (up to 6h) and for greater degradation of NPy. The results of our work confirm that degradation occurs by radical mechanism. Aromatic hydroxymethyl, methoxy, hydroxy and nitroso derivatives of pyrene (Py) are created by low energy UV irradiation. After a massive UV irradiation, the Py aromatic system is destroyed and more polar low-molecular compounds are generated. The photochemical method described in this paper, based on irradiation by UV lamp, is therefore, suitable for degradation of fused benzene ring(s) and thus should also be effective for degradation of other nitrated polycyclic aromatic compounds.
authors.affiliation: Department of Analytical Chemistry, Charles University, 128 43 Praha 2, Czech Republic.
authors.forename: Alexander
authors.initials: A
authors.lastname: Muck
authors.forename: Pavel
authors.initials: P
authors.lastname: Kubát
authors.forename: Anabela
authors.initials: A
authors.lastname: Oliveira
authors.forename: Luis Filipe Vieira
authors.initials: LF
authors.lastname: Ferreira
authors.forename: Josef
authors.initials: J
authors.lastname: Cvacka
authors.forename: Svatopluk
authors.initials: S
authors.lastname: Civis
authors.forename: Zdenek
authors.initials: Z
authors.lastname: Zelinger
authors.forename: Jirí
authors.initials: J
authors.lastname: Barek
authors.forename: Jirí
authors.initials: J
authors.lastname: Zima
mesh_terms: D000327:Adsorption; D002851:Chromatography, High Pressure Liquid; D013058:Mass Spectrometry; D010777:Photochemistry; D010782:Photolysis; D011721:Pyrenes / Q000032:analysis*; D014466:Ultraviolet Rays
chemical_list: D011721:Pyrenes; C032668:1-nitropyrene