Charred cliff ferns lock toxic metals and restore contaminated soil
Feng L, Su J, Chen Z, Chen Z, Yang W
Phytoremediation
If you grow food in soil anywhere near industrial or mining activity, this research points toward a day when contaminated plots could be restored using the very plants already growing on them rather than expensive chemical treatments.
A fern called cliff bracken naturally soaks up rare earth elements from mining soil. Scientists charred these ferns into a biochar-like material and mixed it into heavily contaminated garden soil. The result: toxic metals got locked in place, soil nutrients went up, and the community of helpful soil microbes bounced back.
Key Findings
REE-enriched fern charcoal reduced lead leaching to just 5.46% of control levels, with copper at 38.71% and cadmium at 33.80%.
The amendment more than doubled total soil nitrogen (2.59-fold increase) and raised enzyme activity tied to nitrogen cycling, signaling improved soil biological health.
The charcoal had a specific surface area of 439.48 m² per gram, explaining its strong ability to bind heavy metals through adsorption and by shifting metals into stable soil fractions.
chevron_right Technical Summary
Researchers turned fern clippings from rare earth mining sites into a carbon-rich soil amendment that locks down lead, copper, and cadmium in contaminated farm soils, cutting heavy metal leaching by as much as 95% while also boosting soil nitrogen and beneficial microbial life.
Abstract Preview
Original paper
Carbonisation of rare earth elements hyperaccumulator (Dicranopteris pedata) for remediation of heavy metal contaminated Soil: A Case study.
Carbonisation from Dicranopteris pedata clippings (REE/C) offer a sustainable strategy for the utilisation of phytoremediation biomass in rare earth element (REE) mining regions. In this study, phy...
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Dicranopteris (forkedfern) is a genus of tropical ferns of the family Gleicheniaceae. There are about 20 described species.