Adsorption performance of Ni(II) by KOH-modified biochar derived from different microalgae species
Abstract
Microalgae biochar is potential adsorbents to remove heavy metals from wastewater due to abundant functional groups, high porosity and wide sources, but performance is not fully developed since it depends on microalgae species attributing to distinct morphology and biomass compositions. Here, two microalgae species Chlorella Pyrenoidosa and Scenedesmus Obliquus were used for biochar preparation via KOH-modification, biochar properties and their influences on Ni(II) adsorption were investigated. Ni(II) adsorption performances responding to biochar properties and operating conditions were upgraded via progressive optimization and response surface methodology. Together, adsorption isotherms and kinetics were analyzed to obtain significant factors for Ni(II) removal. As results, 100 % of Ni(II) removal was achieved under 100 mg/L initial Ni(II) concentration as pH was higher than the biochar zero-charge point of 6.87 with low biochar dosage (0.5 g/L), which provides an efficient approach for heavy metal removal from wastewater with microalgae biochar.
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Chlorella pyrenoidosa showed Ni2+ adsorption capacity of 201.18 mg/g when pyrolyzed at 600 °C with KOH activation, following Langmuir isotherm and pseudo-second-order kinetics.
“Among microalgae, Chlorella pyrenoidosa showed a remarkably high Ni 2+ adsorption capacity of 201.18 mg/g when pyrolyzed at 600 • C with KOH activation, following the Langmuir isotherm and pseudo-second-order kinetics [87].”
From Algal-Based Carbonaceous Materials for Environmental Remediation: Advances in Wastewater Treatment, Carbon Sequestration, and Biofuel Applications (2025) · cites this paper as [87]
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- Authors
- Tan, L., Nie, Y., Chang, H., Zhu, L., Guo, K., Ran, X., Zhong, N., Zhong, D., Xu, Y., & Ho, S.-H.
- Affiliations
- Wuhan University (CN)
- Chongqing University of Technology (CN)
- Harbin Institute of Technology (CN)
- Corresponding author
- Chang, Haixing
- Venue
- Bioresource Technology
- Publisher
- Elsevier BV
- Published
- 2024-02
- Volume
- 394
- Pages
- 130287
- ISSN
- 0960-8524 (ISSN-L)
- OpenAlex
- W4390534715
- Cited by
- 87
- References
- 34
- Citations by year
- 2026: 34 · 2025: 32 · 2024: 21
- FWCI
- 10.02
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- Bioresource Technology (publishedVersion)
- PubMed (publishedVersion)
- 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 › Coagulation and Flocculation Studies
- Keywords
- nickel adsorption, KOH modification, Chlorella pyrenoidosa, Scenedesmus obliquus, heavy metal removal, wastewater treatment, adsorption isotherms, adsorption kinetics, pH effect, biochar dosage, response surface methodology
- MeSH terms
- Adsorption, Charcoal, Chlorella, Kinetics, Water Pollutants, Chemical, Metals, Heavy, Microalgae, Wastewater
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