Application of Hydroxyapatite Functionalized Magnetic Rice Husk Biochar for the Adsorption Removal of Cu(II) Ions from Aqueous Solutions
Publication: Journal of Environmental Engineering
Volume 150, Issue 5
Abstract
Biochar with abundant functional groups, porous structure, and high specific surface area has been widely used as an adsorbent for the removal of metal ions, and its low production costs make it economically suitable for large-scale application in various industries. Hydroxyapatite nanoparticles were used to functionalize magnetic rice husk biochar (MBC) to produce hydroxyapatite functionalized magnetic rice husk biochar (HAP@MBC) in this study. The functional groups, magnetism performance, surface morphology, and aperture structure of HAP@MBC were characterized to explore the feasibility of its application in the treatment of wastewater containing Cu(II) ions. It is found that the maximum adsorption removal rate reaches 96.02% at 35°C, , with an adsorbent dosage of and an initial Cu(II) ion concentration of . Additionally, adsorption kinetics, isotherms, and thermodynamics were analyzed to probe into the adsorption mechanism of Cu(II) ions by HAP@MBC. The results show that the adsorption process is very close to the pseudo-second-order model, indicating that the adsorption process is mainly controlled by chemisorption. The adsorption of Cu(II) ions can also be fitted by the intraparticle diffusion model, revealing that the adsorption rate is limited by intraparticle diffusion as well as other factors. Moreover, the adsorption process is consistent with the Langmuir isotherm, and the saturated adsorption capacity is calculated to be . Thermodynamic analysis shows that the value of adsorption enthalpy change is , suggesting the adsorption process is chemisorption. More precisely, it is a spontaneous entropy-increasing reaction, and an increase in the temperature is conducive to the adsorption. To sum up, HAP@MBC exhibits perfect adsorption properties and has the potential to be a novel and promising adsorbent for the removal of Cu(II) ions.
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Data Availability Statement
All data, models, and code generated used during the study appear in the published article.
Acknowledgments
The authors are grateful for the financial support from Jiangxi Provincial Natural Science Foundation (20212BAB214012, 20224BAB204070, and 20224BAB203042). This work is also sponsored by Daily Funding for Postdoctoral Researchers of Jiangxi Province Human Resources and Social Security Department (Grant No. 2021RC25) and the Scientific and Technological Research Project of Education Department in Jiangxi Province (Grant No. GJJ210614).
Author contributions: Chenglong Zou: methodology, funds, resources, data processing guidance, formal analysis, and major revision of the manuscript; Qun Wu: characterization, adsorption experiments, plotting, and writing of original draft; Kun Guan: material preparation, characterization, and data curation; Fahui Nie: conceptualization, project administration, and revision; and Sulin Xiang: revision.
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Published In
Journal of Environmental Engineering
Volume 150 • Issue 5 • May 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Aug 18, 2023
Accepted: Dec 27, 2023
Published online: Mar 9, 2024
Published in print: May 1, 2024
Discussion open until: Aug 9, 2024
ASCE Technical Topics:
- Adsorption
- Agriculture
- Ashes
- Chemical processes
- Chemistry
- Continuum mechanics
- Crops
- Diffusion
- Diffusion (chemical)
- Diffusion (thermal)
- Dynamics (solid mechanics)
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Forces (type)
- Irrigation engineering
- Magnetic fields
- Materials engineering
- Solid mechanics
- Sorption
- Thermodynamics
- Transport phenomena
- Water and water resources
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