Back to Search
Start Over
Arsenic Transformation and Volatilization during Incineration of the Hyperaccumulator Pteris vittata L
- Source :
- Environmental Science & Technology. 42:1479-1484
- Publication Year :
- 2008
- Publisher :
- American Chemical Society (ACS), 2008.
-
Abstract
- 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), As2O5 + P. vittata (L-As) containing low As content (14.7 mg/kg), and As2O5 + 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 As2O5 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.
- Subjects :
- Volatilisation
Waste management
biology
Spectrum Analysis
X-Rays
chemistry.chemical_element
Pteris
Environmental pollution
Incineration
General Chemistry
biology.organism_classification
Arsenic
Phytoremediation
Bioremediation
chemistry
Environmental chemistry
Pteris vittata
Environmental Chemistry
Hyperaccumulator
Volatilization
Biotransformation
Subjects
Details
- ISSN :
- 15205851 and 0013936X
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- Environmental Science & Technology
- Accession number :
- edsair.doi.dedup.....8b564ae609beb33440007faf0834ce43