Adsorption of Cd(II) and Pb(II) by Mg-modified straw biochar
Open accessAbstract
In this work, magnesium-modified rice straw biochar (MgBC) was prepared by chemical impregnation, and the effects of proportion, initial pH, contact time, temperature and initial concentration on the removal of Cd(II) and Pb(II) by MgBC were investigated. Additionally, scanning electron microscopy, Brunauer-Emmett-Teller, Fourier-transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) were used for the characterisation of MgBC. The results shown that MgBC surface contained massive Mg-particles and possessed more abundant O-containing groups. Batch adsorption experiments shown that the optimum adsorption efficiency of Cd(II) and Pb(II) by MgBC was achieved at ratio of 1:2 and initial pH of 6.0. The pseudo-second-order kinetic model and the Langmuir isothermal model could better describe the removal of Cd(II) and Pb(II) by MgBC. The maximum adsorption capacity of Cd(II) and Pb(II) by MgBC was 92.68 and 128.06 mg/g at pH 6.0, 35C and initial concentrations of 10~100 mg/L, respectively. FTIR and XRD analysis shown that the removal mechanism of Cd(II) and Pb(II) by MgBC involved complexation, ions exchange, co-precipitation and electrostatic interaction. After 4 adsorption-desorption experiment, the removal efficiency of Cd(II) and Pb(II) by MgBC remained above 80%. This results indicated that MgBC had great potential for the treatment of wastewater containing Cd(II) and Pb(II).
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Biochar is a by-product of pyrolyzing agricultural and forestry waste, animal manure, and municipal organic matter.
“Biochar is a by-product of pyrolyzing agricultural and forestry waste [10-12], animal manure [13,14], and municipal organic matter.”
From Insight into the Adsorption Behavior of Cd(II) and Pb(II) from Mud by HCl-Modified Coconut Shell Biochar: Experimental and DFT Studies (2025) · cites this paper as [12]
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Self-citation
- Authors
- Li, J.
- Affiliations
- Hubei University of Technology (CN)
- Corresponding author
- Li, Jianfeng
- ORCID
- Li, Jianfeng
- Venue
- Desalination and Water Treatment
- Publisher
- Elsevier BV
- Published
- 2023-04
- Volume
- 292
- Pages
- 131-140
- ISSN
- 1944-3986 (ISSN-L)
- OpenAlex
- W4384434720
- Cited by
- 13
- References
- 35
- Citations by year
- 2026: 8 · 2025: 3 · 2024: 1 · 2023: 1
- FWCI
- 1.04
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Desalination and Water Treatment (publishedVersion, cc-by-nc-nd)
- 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
- cadmium removal, lead removal, rice straw biochar, magnesium-modified biochar, heavy metal adsorption, chemical impregnation, adsorption kinetics, adsorption isotherms, wastewater treatment, co-precipitation, ion exchange, electrostatic interactions, complex formation
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