Investigating the mechanisms of biochar’s removal of lead from solution
Abstract
The objective of this study was to investigate the relationship between Pb(2+) adsorption and physicochemical properties of biochars produced at different pyrolytic temperatures. Ten biochars were prepared from peanut shell (PS) and Chinese medicine material residue (MR) at 300-600°C. Adsorption kinetics and isotherms were determined, and the untreated and Pb(2+)-loaded biochars were analyzed by FTIR, SEM-EDX and XRD. Functional groups complexation, Pb(2+)-π interaction and precipitation with minerals jointly contributed to Pb(2+) adsorption on these biochars. New mineral precipitates (e.g., Pb2(SO4)O and Pb4(CO3)2(SO4)(OH)2) formed during Pb(2+) sorption. For high-temperature biochars (⩾500°C), Pb(2+) sorption via complexation reduced, but the contribution of Pb(2+)-π interaction was enhanced. Dramatic reduction of Pb(2+) sorption on demineralized biochars indicated the dominant role of minerals. These results are useful for screening effective biochars as engineered sorbents to remove or immobilize Pb(2+) in polluted water and soil.
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The maximum sorption capacity of hematite-modified biochar for As(V) in soil could reach 429 mg/kg due to electrostatic sorption and surface functional groups.
“Wang et al. (2015) studied the effect of biochar modified by hematite at 600°C on the removal of As(V) in the soil, and found that the maximum sorption capacity of modified biochar for As(V) could reach 429mg · kg -1 due to the effect of electrostatic sorption and surface functional groups.”
From Modified biochar: synthesis and mechanism for removal of environmental heavy metals (2022) · cites this paper as Wang et al. (2015)
The removal of heavy metals by the original biochar was only 265 mg/kg, and the difference was about 2 times before and after modification.
“However, the removal of heavy metals by the original biochar was only 265mg · kg -1 , and the difference was about 2 times before and after modification.”
From Modified biochar: synthesis and mechanism for removal of environmental heavy metals (2022) · cites this paper as Wang et al. (2015)
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Self-citation
- Authors
- Wang, Z., Liu, G., Zheng, H., Li, F., Ngo, H. H., Guo, W., Liu, C., Chen, L., & Xing, B.
- Affiliations
- Ocean University of China (CN)
- University of Technology Sydney (AU)
- Texas Tech University (US)
- University of Massachusetts Amherst (US)
- Corresponding author
- Li, Fengmin
- ORCID
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2015-02
- Volume
- 177
- Pages
- 308-317
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W2073401726
- Cited by
- 450
- References
- 33
- Citations by year
- 2026: 24 · 2025: 32 · 2024: 53 · 2023: 38 · 2022: 68 · 2021: 50 · 2020: 44 · 2019: 41 · 2018: 43 · 2017: 36 · 2016: 17 · 2015: 4
- FWCI
- 14.31
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- UTS ePRESS (University of Technology Sydney) (submittedVersion)
- Funders
- Ocean Public Welfare Scientific Research Project (201305021)
- National Natural Science Foundation of China (41406085, 2012-5-002-SW, MAS 00028)
- Fundamental Research Funds for the Central Universities (201413010)
- China Postdoctoral Science Foundation (2014M550374)
- Development of Science and Technology Project from Shinan District in Qingdao
- USDA NIFA Hatch Program
- Topics
- Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
- Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
- Physical Sciences › Environmental Science › Pollution › Heavy metals in environment
- Keywords
- biochar, lead adsorption, peanut shell, Chinese medicine residue, pyrolysis temperature, adsorption kinetics, adsorption isotherms, π-π stacking, mineral precipitation, heavy metal immobilization
- MeSH terms
- Adsorption, Charcoal, Drugs, Chinese Herbal, Hydrogen-Ion Concentration, Kinetics, Lead, Minerals, Oxygen, Arachis, Chemical Precipitation, Solutions, Temperature, Time Factors, Water Pollutants, Chemical
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