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Arsenic transformation and volatilization during incineration of the hyperaccumulator Pteris vittata L
Yan X. L.; Chen T. B.; Liao X. Y.; Huang Z. C.; Pan J. R.; Hu T. D.; Nie C. J.; Xie H.
Source PublicationEnvironmental Science & Technology
2008
Volume42
Issue5
Pages1479-1484
KeywordLow-temperature Pyrolysis Trace-elements Heavy-metals Treated Wood Coal Behavior Biomass Copper Plant Phytoextraction
AbstractSafe incineration of harvested hyperaccumulators; containing high content of heavy metals to avoid secondary environmental pollution is a problem for popularizing phytoremediation technology. The As volatilization behavior and its mechanism during incineration of Pteris vittata, an As-hyperaccumulator, was investigated. Incineration results reveal that 24% of total As accumulated by P. vittata (H-As) containing high As content (1170 mg/kg) is emitted at 800 degrees C, of which 62.5% of the total emitted As is volatilized below 400 degrees C. A study of the extended X-ray absorption fine structure (EXAFS) shows that part of As(III) was identified in the thermal decomposition residue of dried P. vittata (H-As), AS(2)O(5) + P. vittata (L-As) containing low As content (14.7 mg/kg), and AS(2)O(5) + charcoal (C) at 200 degrees C, suggesting that carbon originating from biomass incineration might catalyze As(V) reduction. This speculation was tested through thermogravimetric experiments, in which either C or P. vittata (L-As) markedly catalyzed the volatilization of pure AS(2)O(5) at low temperature. Therefore, the reduction of As(V) to As(III) is responsible for As volatilization during incineration of P. vittata below 400 degrees C. This study provides important insights into As behavior during incineration of As-hyperaccumulators, which is helpful to safely dispose harvested biomass with high As content.
Indexed BySCI
Language英语
ISSN0013-936X
Document TypeSCI/SSCI论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/22621
Collection历年回溯文献
Recommended Citation
GB/T 7714
Yan X. L.,Chen T. B.,Liao X. Y.,et al. Arsenic transformation and volatilization during incineration of the hyperaccumulator Pteris vittata L. 2008.
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