title: Photodegradation of PCDD/Fs adsorbed on spruce (Picea abies (L.) Karst.) needles under sunlight irradiation.
abstract: Spruce (Picea abies (L.) Karst.) needles were exposed to exhaust gas containing polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) generated by combustion of polyvinyl chloride, wood, high-density polyethylene, and styrene. Photodegradation of PCDD/Fs adsorbed on spruce needles under sunlight irradiation was studied. The photodegradation of PCDD/Fs follows pseudo-first-order reaction kinetics, with photolysis half-lives ranging between 40 and 100 h. The photolysis rates of PCDF congeners are higher than PCDD congeners with the same chlorinated substitutions. Higher chlorinated PCDD/Fs tend to photolyze slowly. The wax components in spruce needles may act as proton donors and accelerate the photolysis rate. C-Cl cleavage through the addition of protons to PCDD/F molecules may be an important route for PCDD/Fs photodegradation.
authors.affiliation: School of Environmental Science and Technology, Dalian University of Technology, Dalian 116012, PR China.
authors.forename: Junfeng
authors.initials: J
authors.lastname: Niu
authors.forename: Jingwen
authors.initials: J
authors.lastname: Chen
authors.forename: B
authors.initials: B
authors.lastname: Henkelmann
authors.forename: Xie
authors.initials: X
authors.lastname: Quan
authors.forename: Fenglin
authors.initials: F
authors.lastname: Yang
authors.forename: A
authors.initials: A
authors.lastname: Kettrup
authors.forename: K-W
authors.initials: KW
authors.lastname: Schramm
mesh_terms: D000327:Adsorption; D001572:Benzofurans / Q000032:analysis / Q000528:radiation effects*; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants / Q000032:analysis / Q000528:radiation effects*; D010782:Photolysis; D028222:Picea / Q000737:chemistry*; D018515:Plant Leaves / Q000737:chemistry; D000072317:Polychlorinated Dibenzodioxins / Q000031:analogs & derivatives* / Q000032:analysis / Q000528:radiation effects*; D013472:Sunlight; D013997:Time Factors
chemical_list: D001572:Benzofurans; D000072338:Dibenzofurans, Polychlorinated; D004785:Environmental Pollutants; D000072317:Polychlorinated Dibenzodioxins