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Updated: Jul 9, 2026

Physical, Chemical and Biological Characterization of Six Biochars Produced for the Remediation of Contaminated Sites
Published on: November 28, 2014
Quantitative contribution of dissolution-driven precipitation to Pb(II) removal by biochars during adsorption process
Anila Sikandar1, Jing Zhao1, Shakeel Ahmad1
1Faculty of Environmental Science & Engineering, Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control, Yunnan International Joint Laboratory for Emission Reduction and Carbon Sequestration in Agricultural Soils, Kunming University of Science & Technology, Kunming, 650500, China.
Biochar effectively immobilizes lead (Pb(II)) in soil remediation primarily through dissolution-driven precipitation, enhanced by released dissolved organic carbon (DOC). This study clarifies the mechanisms behind biochar
Area of Science:
- Environmental Science
- Soil Science
- Geochemistry
Background:
- Biochar (BC) is widely used for lead (Pb(II)) immobilization in soil remediation.
- The precise mechanisms of Pb(II) removal by BC, particularly dissolution-driven precipitation, remain incompletely understood.
Purpose of the Study:
- To investigate the mechanisms of Pb(II) removal by biochar, differentiating between biochar-only and dissolved organic carbon (DOC) systems.
- To elucidate the role of dissolution-driven precipitation and DOC in enhancing Pb(II) immobilization.
Main Methods:
- Kinetics and isotherm studies to quantify Pb(II) removal.
- Analysis of inorganic anion reduction (carbonate, sulfate, phosphate).
- X-ray diffraction (XRD) for mineral phase identification.
- Fluorescence spectroscopy to assess dissolved organic matter changes.
- Varied DOC concentrations to evaluate its impact on Pb(II) removal.
Main Results:
- Pb(II) removal by biochar ranged from 31.11% to 80.92%.
- Dissolution-driven precipitation significantly contributed to Pb(II) removal (23.42% to 84.03%), with carbonate being a major facilitator.
- XRD confirmed the formation of cerussite (PbCO3) and anglesite (PbSO4) on biochar surfaces.
- Decreased fluorescence of humic-like and fulvic-like substances indicated Pb(II) interaction with DOC.
- Increased DOC concentration enhanced Pb(II) removal, suggesting a coagulation effect.
Conclusions:
- Dissolved organic carbon (DOC) released from biochar plays a crucial role in Pb(II) precipitation through a coagulation effect.
- The study provides mechanistic insights into the combined contributions of adsorption and dissolution-driven precipitation in biochar-based soil remediation.
- Understanding these mechanisms is vital for optimizing biochar application for effective lead immobilization.
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