Efficient performance of magnesium oxide loaded biochar for the significant removal of Pb2+ and Cd2+ from aqueous solution
Open accessAbstract
Lead (Pb) and cadmium (Cd) are considered as a typical heavy metals in aqueous solution, which may pose adverse health effects on human beings. For the removal of these two pollutants, magnesium oxide (MgO) was successfully immobilized onto eucalyptus biochar (BC) matrix via simple and cost-effective pyrolysis process of MgCl2-pretreated eucalyptus biomass under high temperature (500 °C). Synthesized MgO nanoparticles-biochar composites (MBC) exhibited superior removal performance for target pollutants, and achieve 99.9% removal efficiency for Pb(II) and Cd(II) at optimum conditions (0.02 g, pH in range of 4–7, and reaction time 120, 240 min). Furthermore, the maximum theoretical adsorbing amount of MBC was 829.11 mg/g for Pb(II) and 515.17 mg/g for Cd(II). Pseudo-second-order model and Langmuir models were well-determined for isotherm and adsorption kinetics. FTIR, XRD, and XPS analysis revealed that precipitation and ion exchange was of great importance for the removal of contaminants. Besides, cation-π interaction and complexation from the carbon-containing functional groups should not be neglected. Considering the advantage of low-cost, facile preparation, and brilliant adsorption capacity, it is anticipated that MBC has a promising prospect for the broad application in Pb(II)/Cd(II)-containing wastewater treatment.
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The enhanced CO2 adsorption capacity of magnesium-metal-impregnated biochar can be attributed to the lower amounts of aromatic, amide, and carboxyl carbons in the other samples.
“This enhanced capacity can be attributed to the lower amounts of aromatic, amide, and carboxyl carbons in those other samples89.”
From Metals incorporated agricultural waste corn Cob-based biochar used as an adsorbent for CO2 capturing (2025) · cites this paper as [89]
The Structure, morphology, and elemental composition section discusses aromatic and carboxyl functional groups in MgO-loaded biochar, but does not compare their amounts across samples or link them to CO2 adsorption. The Adsorption and removal mechanism section addresses Pb(II) and Cd(II) removal instead. Searches for CO2 adsorption and for aromatic, amide, and carboxyl carbons found no passage supporting the claimed explanation. (LLM, conf=0.76)
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- Authors
- Shi, Q., Zhang, H., Shahab, A., Zeng, H., Zeng, H., Bacha, A.-U.-R., Nabi, I., Siddique, J., & Ullah, H.
- Affiliations
- Guilin University of Technology (CN)
- Fudan University (CN)
- Quaid-i-Azam University (PK)
- Zhejiang University (CN)
- Corresponding author
- Zhang, Hua
- Shahab, Asfandyar
- Venue
- Ecotoxicology and Environmental Safety
- Publisher
- Elsevier BV
- Published
- 2021-09
- Volume
- 221
- Pages
- 112426
- ISSN
- 0147-6513 (ISSN-L)
- OpenAlex
- W3176463737
- Cited by
- 130
- References
- 49
- Citations by year
- 2026: 23 · 2025: 24 · 2024: 23 · 2023: 40 · 2022: 14 · 2021: 6
- FWCI
- 6.17
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Ecotoxicology and Environmental Safety (publishedVersion, cc-by-nc-nd)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- Funders
- Scientific Research and Technology Development Program of Guangxi (-AD18126018, GuiKe -AD18126018, 2018GXNSFGA281001)
- 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 › Water Science and Technology › Heavy Metal Pollution Remediation
- Keywords
- magnesium oxide, biochar, eucalyptus biomass, heavy metal removal, lead, cadmium, adsorption, pyrolysis, magnesium oxide nanoparticles, wastewater treatment, ion exchange, cation-π interactions, adsorption isotherms, adsorption kinetics
- MeSH terms
- Adsorption, Cadmium, Charcoal, Eucalyptus, Lead, Magnesium Oxide, Solutions, Water Pollutants, Chemical, Water Purification
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