Cited by 161Adsorption and biosorption for pollutant removalEnvironmental remediation with nanomaterialsHeavy Metal Pollution Remediation

Capacity and Potential Mechanisms of Cd(II) Adsorption from Aqueous Solution by Blue Algae-Derived Biochars

Liu, Panyang, Rao, Dean, Zou, Luyi, Teng, Yue, Yu, Hongyan·2021·Science of The Total Environment

Abstract

The removal of potentially toxic metals by biochars is currently a popular and salutary method. In this study, we combined the advantages of blue algae (Microcystic) and pyrolysis technology to produce a late-model biochar. Moreover, the adsorption capacity and potential mechanisms of blue algae-derived biochars for the removal of cadmium (Cd) from aqueous solution were evaluated in comparison with the adsorption capacity and potential mechanisms of corn straw-derived biochar (CSBC) and rice husk-derived biochar (RHBC). Batch adsorption experiments were used to explore the adsorption performance of biochars, and a wide range of characterization techniques were employed: scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy and zeta potential analysis. The results showed that the adsorption isotherms could be described well by the Langmuir model and that the pseudo-second-order model fit the Cd(II) adsorption kinetics best, indicating that the process was monolayer and controlled by chemisorption. Moreover, the Cd(II) removal capacity of optimal blue algae-derived biochar (BC600-2) (135.7 mg g-1) was 85.9% and 66.9% higher than the removal capacity of CSBC and RHBC, respectively. In addition, the results of the characterization methods showed that precipitation with minerals was the primary mechanism, accounting for 68.7-89.5% of the capacity. Overall, blue algae-derived biochars, as a product from freshwater biowaste, may be a novel and potentially valuable adsorbent for Cd(II) removal.

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Crossref · 10.1016/j.scitotenv.2021.145447

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Authors
Liu, P., Rao, D., Zou, L., Teng, Y., & Yu, H.
Affiliations
Jiangnan University (CN)
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2021-05
Volume
767
Pages
145447
ISSN
0048-9697 (ISSN-L)
OpenAlex
W3127412601
Cited by
161
References
70
Citations by year
2026: 24 · 2025: 32 · 2024: 34 · 2023: 31 · 2022: 23 · 2021: 17
FWCI
7.80
Type
journal article
Language
en
Open access
closed
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Key Research and Development Program of China (2018YFC1902105)
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
cadmium removal, biochar, Microcystis, pyrolysis, adsorption, heavy metal removal, adsorption isotherms, adsorption kinetics, precipitation chemistry, corn straw biochar, rice husk biochar, adsorption mechanism
MeSH terms
Adsorption, Cadmium, Charcoal, Kinetics, Water Pollutants, Chemical

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