Effects of plastic addition on rare earth elements in <i>Dicranopteris Pedata</i> pyrolysis biochar

DAI Jinhao; XIONG Weibin; CHEN Zhiqiang; LIN Qiang; HU Wenjing; XIE Yanmin

doi:10.13205/j.hjgc.202505016

Volume 43 Issue 5

May 2025

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2025 > 43(5): 143-152

DAI Jinhao, XIONG Weibin, CHEN Zhiqiang, LIN Qiang, HU Wenjing, XIE Yanmin. Effects of plastic addition on rare earth elements in Dicranopteris Pedata pyrolysis biochar[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 143-152. doi: 10.13205/j.hjgc.202505016

Citation:

DAI Jinhao, XIONG Weibin, CHEN Zhiqiang, LIN Qiang, HU Wenjing, XIE Yanmin. Effects of plastic addition on rare earth elements in Dicranopteris Pedata pyrolysis biochar[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(5): 143-152. doi: 10.13205/j.hjgc.202505016

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Effects of plastic addition on rare earth elements in Dicranopteris Pedata pyrolysis biochar

doi: 10.13205/j.hjgc.202505016

1. School of Geographical Sciences & Future Technology Institute for Carbon Neutrality, Fujian Normal University, Fuzhou 350108, China;
2. Fujian Soil and Water Conservation Experimental Station, Fuzhou 350003, China;
3. Changting County Soil and Water Conservation Bureau, Longyan 366300, China

Received Date: 2024-10-07
Accepted Date: 2024-12-19
Rev Recd Date: 2024-12-03

Available Online: 2025-09-11

Abstract

Abstract

The harvesting waste of Dicranopteris Pedata in the tailing areas of ionic rare earth mines in southern China poses a huge risk of secondary pollution of rare earth elements.This study aims to explore the harmless utilization of the harvesting waste of Dicranopteris Pedata and its rare earth elements through co-pyrolysis with plastics. The rare earth hyperaccumulator Dicranopteris Pedata（DP） was co-pyrolyzed with four types of plastics （PVC， PP， PE， and PS） respectively at target temperature gradients to obtain biochar containing rare earth. The contents， speciation， bioavailability， and leaching toxicity of rare earth elements in Dicranopteris Pedata and biochar were studied， and an ecological risk assessment of rare earth elements was carried out. The results showed that pyrolysis could reduce the content of unstable forms of rare earth elements in the biomass of Dicranopteris Pedata from 60.51% to 15% below， decrease the bioavailability by more than 95%， and thus reduce the environmental risk of rare earth elements in solid residues. When the four types of plastics were added and pyrolyzed within the temperature range of 600 to 800℃， the proportions of unstable forms of rare earth elements in the biomass of Dicranopteris Pedata was reduced to within 9%， the bioavailability decreased to less than 1%， and the leaching toxicity was reduced by 80%， further reducing the environmental risk of rare earth elements. Therefore， the off-site application of rare earth biochar obtained by co-pyrolyzing plastics and Dicranopteris Pedata at a certain target temperature will not bring new environmental risks.
- Dicranopteris pedata,
- mixed pyrolysis,
- rare earth elements,
- morphological analysis,
- ecological risk assessment

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