Cited by 61Algal biology and biofuel productionCoagulation and Flocculation StudiesAdsorption and biosorption for pollutant removal

Algal cells harvesting using cost-effective magnetic nano-particles

Almomani, Fares·2020·Science of The Total Environment

Abstract

Innovative iron-based nanoparticles were synthesized, characterized and tested for the first time for harvesting single and mixed algal culture from real wastewater. The tailor-made magnetic nanoparticles (MNPs; Fe-MNP-I and Fe-MNP-II) achieved a percentage algae harvesting efficiency (%AHE) higher than 95% using a concentration of MNPs (C MNP) of 25 ± 0.3 (std. dev = 0.08) mg.L-1, mixing speed (M speed) of 120 ± 2 (std. dev = 0.10) rpm, short contact time (C t) of 7 ± 0.1 (std. dev = 0.05) min and separation time (SP t) of 3 ± 0.1 (std. dev = 0.09) min. The optimum operational conditions for harvesting of Chlorella vulgaris (C.v) were determined at (C MNP = 40 ± 0.4 (std. dev = 0.5) g MNPs.L-1, SP t = 2.5 ± 0.4 (std. dev = 0.1) min, M speed = 145 ± 3 (std. dev = 1.50) rpm and C t = 5 ± 0.3 (std. dev = 0.10) min using surface response methodology. Langmuir model describes better the adsorption behavior of algae-Fe-MNP-I system, while both Langmuir and Freundlich fit well the adsorption behavior of algae-Fe-MNP-II. The maximum adsorption capacity of Spirulina platensis (SP.PL) (18.27 ± 0.07 (std. dev = 0.19) mg DWC.mg particles-1) was higher than that for Chlorella vulgaris (C.v) (11.52 ± 0.01 (std. dev = 0.34) mg DWC.mg particles-1) and mixed algal culture (M.X) (17.20 ± 0.07 (std. dev = 0.54) mg DWC.mg particles-1) over Fe-MNP-I. Zeta potential measurements revealed that the adsorption mechanism between MNPs and algal strains is controlled by electrostatic interaction. The synthesized MNPs were recycled 10 times using alkaline-ultrasonic regeneration procedure.

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Crossref · 10.1016/j.scitotenv.2020.137621

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  • Magnetite (Fe2O3) nanoparticles adsorbed directly onto cell surfaces can be separated from the medium by applying a magnetic field, combining flocculation and separation into a single process.

    “Magnetite (Fe2O3) nanoparticles adsorbed directly onto cell surfaces can be separated from the medium by applying a magnetic field, combining flocculation and separation into a single process [55].”

    From Key Targets for Improving Algal Biofuel Production (2021) · cites this paper as [55]

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Authors
Almomani, F.
Affiliations
Qatar University (QA)
Corresponding author
Almomani, Fares
Venue
Science of The Total Environment
Publisher
Elsevier BV
Published
2020-06
Volume
720
Pages
137621
ISSN
0048-9697 (ISSN-L)
OpenAlex
W3008591923
Cited by
61
References
85
Citations by year
2026: 8 · 2025: 10 · 2024: 5 · 2023: 9 · 2022: 18 · 2021: 9 · 2020: 2
FWCI
1.88
Type
journal article
Language
en
Open access
closed
Locations
  • The Science of The Total Environment (publishedVersion)
  • PubMed (publishedVersion)
  • Qatar University QSpace (Qatar University) (submittedVersion)
Topics
  • Physical Sciences › Energy › Renewable Energy, Sustainability and the Environment › Algal biology and biofuel production
  • Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
Keywords
magnetic nanoparticles, iron-based nanoparticles, algal harvesting, wastewater treatment, Chlorella vulgaris, Spirulina platensis, mixed algal culture, adsorption, Langmuir isotherm, Freundlich isotherm, zeta potential, electrostatic adsorption, nanoparticle recycling
MeSH terms
Adsorption, Cost-Benefit Analysis, Magnetics, Chlorella vulgaris, Magnetite Nanoparticles, Magnetic Phenomena

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