title: Chlorination mechanism of carbon during dioxin formation using Cl-K near-edge X-ray-absorption fine structure.
abstract: Many environmental organic chemicals have chloride in their structure. Thus, researching the chlorination mechanism of carbon is of interest. Dioxins are typically concentrated in fly ash collected from the post-combustion zone during the operation of municipal solid waste incinerators. In this study, we report the application of Cl-K near-edge X-ray-absorption fine structure (NEXAFS) in determining the chlorination mechanism of carbon in fly ash. The separation of a chloride-carbon (C-Cl) bond was readily recognizable as a peak in the Cl-K NEXAFS spectrum. Chlorination effects could be estimated using Cl K-edge NEXAFS with no dependence on metal species. Analysis of Cl K-edge NEXAFS spectra showed the reduction of copper(II) chloride at 300°C and oxidation of iron(III) chloride at 400°C in connection with the chlorination of carbon.
authors.affiliation: Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo, Kyoto 615–8540, Japan. fujimori.takashi@nies.go.jp
authors.forename: Takashi
authors.initials: T
authors.lastname: Fujimori
authors.forename: Yuta
authors.initials: Y
authors.lastname: Tanino
authors.forename: Masaki
authors.initials: M
authors.lastname: Takaoka
authors.forename: Shinsuke
authors.initials: S
authors.lastname: Morisawa