Application and mechanisms of microalgae harvesting by magnetic nanoparticles (MNPs)

Fu, Yu; Hu, Fanglu; Li, Hanbing; Li, Cui; Qian, Guangren; Zhang, Dayi; Xu, Yunfeng

doi:10.1016/j.seppur.2021.118519

Cited by 30 publications

(17 citation statements)

References 42 publications

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“…Studies of adsorption kinetics play an important role in identifying the required equilibration time, the optimal contact time, and the mechanism of the adsorption process [ 60 ]. The kinetic aspects of adsorption have not yet been studied in detail.…”

Section: Resultsmentioning

confidence: 99%

“…The authors of [ 64 ] suggested that the principal mechanism of the algae harvesting process ( C. vulgaris and tailor-made magnetic nanoparticles) was bridging. Furthermore, some authors [ 60 ] used an extended Derjaguin–Landau–Verwey–Overbeek (EDLVO) theory to demonstrate the contributions of the surface properties of membranes or flocculants to colloidal interactions. The EDLVO theory may be used to reveal the principles of interaction between the magnetic nanoparticles and algae cells.…”

Section: Resultsmentioning

confidence: 99%

“…The EDLVO theory may be used to reveal the principles of interaction between the magnetic nanoparticles and algae cells. Although the electrostatic interaction is described by the net characteristic of all charged groups on the surface of microalgae cells and the magnetic surface of NP, it might appear in sophisticated bilayer microdomains [ 60 ]. This fact is confirmed by microscopy images of the system after adhesion, which show an agglomerated Fe 3 O 4 structure that covers only a part of the microalgae cell wall and is heterogeneously distributed, leaving parts of the cell wall surface free ( Figure 10 ).…”

Section: Resultsmentioning

confidence: 99%

“…A bare magnetite was used for the harvesting of Chlorella pyrenoidosa and C. minutissima [ 59 ], Nannochloropsis maritime [ 60 ], Scenedesmus obliquus [ 61 ], and Chlorella vulgaris [ 62 , 63 , 64 ]. The uncoated magnetic nanoparticles (NPs) were also studied in the harvesting of Microcystis aeruginosa [ 65 ].…”

Section: Introductionmentioning

confidence: 99%

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Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Gerulová¹,

Kucmanová²,

Sanny³

et al. 2022

Nanomaterials

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Magnetic separation of microalgae using magnetite is a promising harvesting method as it is fast, reliable, low cost, energy-efficient, and environmentally friendly. In the present work, magnetic harvesting of three green algae (Chlorella vulgaris, Chlorella ellipsoidea, and Auxenochlorella protothecoides) and one cyanobacteria (Microcystis aeruginosa) has been studied. The biomass was flushed with clean air using a 0.22 μm filter and fed CO2 for accelerated growth and faster reach of the exponential growth phase. The microalgae were harvested with magnetite nanoparticles. The nanoparticles were prepared by controlled co-precipitation of Fe2+ and Fe3+ cations in ammonia at room temperature. Subsequently, the prepared Fe3O4 nanoparticles were coated with polyethyleneimine (PEI). The prepared materials were characterized by high-resolution transmission electron microscopy, X-ray diffraction, magnetometry, and zeta potential measurements. The prepared nanomaterials were used for magnetic harvesting of microalgae. The highest harvesting efficiencies were found for PEI-coated Fe3O4. The efficiency was pH-dependent. Higher harvesting efficiencies, up to 99%, were obtained in acidic solutions. The results show that magnetic harvesting can be significantly enhanced by PEI coating, as it increases the positive electrical charge of the nanoparticles. Most importantly, the flocculants can be prepared at room temperature, thereby reducing the production costs.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Gerulová¹,

Kucmanová²,

Sanny³

et al. 2022

Nanomaterials

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“…[ 36 ] Fu et al (2021) used magnetic particles synthesized by co‐precipitation of FeCl 2 and FeCl 3 under alkaline pH (NH 3 ) in investigation of harvesting Nannochloropsis maritime . [ 37 ] Microwave‐synthesized naked magnetite (Fe 3 O 4 ) particles were employed for harvesting of Chlorella vulgaris . [ 38 ] Markeb et al (2019) used magnetite‐based nanoparticles (Fe 3 O 4 NPs) for harvesting Scenedesmus sp.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Chlorella biomass using Fe₃O₄ and Fe₃O₄@SiO₂ magnetic nanoparticles: isotherm and thermodynamic characteristics of adsorption

Van,

Van Toan,

Dung

et al. 2023

Vietnam Journal of Chemistry

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Harvesting microalgae by centrifugation and filtration is very costly, affecting technical and economical feasibility of downstream processing of algal biomas to bioproducts. Flocculation is a potential technique for recovery of algae biomass. Particularly, flocculation using magnetic nanoparticles offers high separation efficiency due to their high surface area and magnetic properties. In this work, the synthesized magnetic nanoparticles including Fe3O4 and Fe3O4@SiO2 were used to harvest C. sorokiniana TH01 from aqueous suspension. The effects of pH, adsorbent dosage, algal biomass concentration, temperature and reaction time on harvesting performance were investigated. It was revealed that the optimal C. sorokiniana TH01 harvesting conditions for Fe3O4 were pH of 5, adsorbent dosage of 0.5 g/L, biomass concentration of 2‐2.5 g/L, temperature 25oC and reaction time 20‐30 min. For Fe3O4@SiO2, the optimal conditions were pH of 7, adsorbent dosage of 0.6 g/L, with the same biomass concentration, temperature and reaction time as Fe3O4. Under the optimal conditions, Fe3O4 and Fe3O4@SiO2 can be regenerated up to three cycles with harvesting efficiency till remained over 55%. Adsorption of C. sorokiniana TH01 on Fe3O4 and Fe3O4@SiO2 exhibited the best fitness with Langmuir isortherm with R2 and maximal adsorption capacity estimated of 0.995 and 6.55 g/g and 0.9971 and 9.53 g/g, respectively. Thermodynamics study revealed that an adsorption of C. sorokiniana TH01 on Fe3O4 and Fe3O4@SiO2 was exothermic process. Furthermore, XRD, EDS, SEM, TGA and FT‐IR data confirmed the successful binding of microalgae cells on surfaces of Fe3O4 and Fe3O4@SiO2. The super‐magnetization intensities (> 22 emu/g) of the synthesized materials demonstrated an excellent separation capability with external magnetic devices.

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Harvesting and Lipid Extraction Techniques of Microalgae in Wastewater

Prakash

Vasistha

2023

Microalgae Biotechnology for Wastewater Treatment, Resource Recovery and Biofuels

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Application and mechanisms of microalgae harvesting by magnetic nanoparticles (MNPs)

Cited by 30 publications

References 42 publications

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Recovery of Chlorella biomass using Fe₃O₄ and Fe₃O₄@SiO₂ magnetic nanoparticles: isotherm and thermodynamic characteristics of adsorption

Harvesting and Lipid Extraction Techniques of Microalgae in Wastewater

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Application and mechanisms of microalgae harvesting by magnetic nanoparticles (MNPs)

Cited by 30 publications

References 42 publications

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Fe3O4-PEI Nanocomposites for Magnetic Harvesting of Chlorella vulgaris, Chlorella ellipsoidea, Microcystis aeruginosa, and Auxenochlorella protothecoides

Recovery of Chlorella biomass using Fe3O4 and Fe3O4@SiO2 magnetic nanoparticles: isotherm and thermodynamic characteristics of adsorption

Harvesting and Lipid Extraction Techniques of Microalgae in Wastewater

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Product

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Recovery of Chlorella biomass using Fe₃O₄ and Fe₃O₄@SiO₂ magnetic nanoparticles: isotherm and thermodynamic characteristics of adsorption