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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.
	2008
关键词	low-temperature pyrolysis trace-elements heavy-metals treated wood coal behavior biomass copper plant phytoextraction
英文摘要	Safe 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.
出处	Environmental Science & Technology
卷	42
期	5
页	1479-1484
收录类别	SCI
语种	英语
ISSN号	0013-936X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22621]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 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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