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Formation of chlorinated aromatics in model fly ashes using various copper compounds
M Takaoka1, T Fujimori, A Shiono
1Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, Japan.
Chemosphere
|May 11, 2010
Summary
Copper compounds in fly ash influence chlorinated aromatic formation. Copper chloride significantly increases chlorobenzene and polychlorinated biphenyls, unlike other copper forms, highlighting its critical role.
Area of Science:
- Environmental Chemistry
- Materials Science
Background:
- Fly ash contains various copper compounds.
- Copper compounds are linked to chlorinated aromatic formation.
- Understanding these interactions is crucial for environmental remediation.
Purpose of the Study:
- Investigate chlorinated aromatic formation potentials in model fly ashes.
- Analyze the chemical behavior of different copper compounds.
- Determine the role of specific copper compounds in pollutant generation.
Main Methods:
- Utilized model fly ashes with diverse copper compounds (metal, hydroxide, carbonate, oxides, chloride).
- Quantified generated chlorobenzene (CBz) and polychlorinated biphenyls (PCBs).
- Analyzed copper compound speciation using X-ray absorption near edge structure (XANES) spectroscopy.
Main Results:
- Copper metal, hydroxide, carbonate, and oxides showed low CBz and PCBs formation.
- Copper chloride resulted in significantly higher CBz and PCBs generation.
- XANES indicated copper chloride's dynamic changes and the role of CuCl at 300°C.
Conclusions:
- Copper chloride is a key driver for chlorinated aromatic formation in fly ash.
- The presence of CuCl is critical for high CBz and PCBs generation.
- Different copper species exhibit distinct catalytic activities in forming chlorinated aromatics.
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