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Area of Science:

  • Biotechnology
  • Materials Science
  • Environmental Science

Background:

  • Magnetic nanoparticles (MNPs) offer efficient microalgae harvesting.
  • High synthesis costs limit widespread MNP application.
  • Novel MNP sources are needed to reduce costs.

Purpose of the Study:

  • Investigate MNPs from particulate matter for microalgae harvesting.
  • Compare naked MNPs with tannin-functionalized MNPs.
  • Optimize harvesting efficiency and assess reusability.

Main Methods:

  • Synthesized MNPs from particulate matter, characterized by XRD, TEM, SEM, EDS, FTIR, and zeta potential.
  • Performed full factorial experiments to optimize pH and MNP concentration for harvesting efficiency.
  • Assessed harvesting efficiency (HE %) and nanoparticle reusability.

Main Results:

  • Magnetite MNPs (30.5 ± 9.56 nm) were derived from particulate matter.
  • Naked MNPs achieved 86% HE at pH 3 and 1250 mg/L.
  • Functionalized MNPs reached 77% HE at pH 3.5 and 1100 mg/L, but increased reusability from 3 to 7 cycles.

Conclusions:

  • MNPs from particulate matter are effective for microalgae harvesting.
  • Naked MNPs offer higher initial efficiency, while functionalized MNPs provide enhanced stability and reusability.
  • Cost-effective MNP production is feasible using particulate matter for microalgae cultivation.