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Selection and combustion of Ni-hyperaccumulators for the phytomining process.
International Journal of Phytoremediation
|June 18, 2014
Summary
Phytomining, using hyperaccumulating plants to recover nickel from serpentine soils, is feasible. Plant leaves, particularly Leptoplax, showed high nickel concentrations, and optimized biomass combustion yielded nickel-rich ashes suitable for metal recovery.
Area of Science:
- Environmental Science
- Biotechnology
- Metallurgy
Background:
- Phytomining offers a sustainable method for nickel recovery from serpentine soils.
- Hyperaccumulating plants concentrate metals, making them valuable for bio-mining.
- Valorization of nickel from plant biomass requires efficient processing.
Purpose of the Study:
- To evaluate nickel content in organs of 14 hyperaccumulator plants from genera Alyssum, Leptoplax, and Bornmuellera.
- To investigate biomass combustion parameters for nickel recovery.
- To establish optimal conditions for producing nickel-rich ashes from plant biomass.
Main Methods:
- Analysis of nickel concentration in plant organs (leaves, stems, roots).
- Biomass combustion experiments at varying temperatures and durations.
- Characterization of resulting ash for nickel content.
Main Results:
- Highest nickel concentration found in Leptoplax leaves (34.3 +/- 0.7 mg g(-1)DM).
- Biomass combustion at 550°C for 3 hours yielded optimal ash quality.
- Achieved up to 20 wt% nickel in biomass ashes.
Conclusions:
- Phytomining is a viable strategy for nickel recovery from serpentine soils.
- Biomass ashes from hyperaccumulators serve as a valuable bio-ore for nickel extraction.
- Optimized combustion is crucial for efficient nickel recovery from plant biomass.
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