Photodegradation of PCDD/Fs adsorbed on spruce (Picea abies (L.) Karst.) needles under sunlight irradiation

被引：61

作者：

Niu, JF

Chen, JW

Henkelmann, B

Quan, X

Yang, FL

Kettrup, A

Schramm, KW

机构：

[1] GSF, Natl Res Ctr Environm & Hlth, Inst Ecol Chem, D-85764 Neuherberg, Munich, Germany

[2] Dalian Univ Technol, Sch Environm Sci & Technol, Dalian 116012, Peoples R China

[3] Tech Univ Munich, Lehrstuhl Okol Chem & Umweltanalyt, D-85350 Freising Weihenstephan, Germany

来源：

CHEMOSPHERE | 2003年 / 50卷 / 09期

基金：

中国国家自然科学基金;

关键词：

photodegradation; PCDD/Fs; spruce needles; sunlight irradiation;

D O I：

10.1016/S0045-6535(02)00509-X

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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. (C) 2002 Elsevier Science Ltd. All rights reserved.

引用

页码：1217 / 1225

页数：9

共 36 条

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