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- Title
A comparative study: biological and chemical synthesis of iron oxide nanoparticles and their affinity towards adsorption of methylene blue dye.
- Authors
Hammad, Doaa Mohamed; Asaad, Amany Ahmed
- Abstract
Biological synthesis of iron oxide nanomaterial using a water extract of Chlorella vulgaris microalga was carried out to investigate its efficiency in adsorbing methylene blue dye (MB) compared with another nanomaterial chemically prepared. Biologically synthesized FeO nanoparticles (BS-FeONPs) and chemically synthesized FeO nanoparticles (CS-FeONPs) were characterized by Brunauer-Emmett-Teller (BET) method, transmission electron microscopy (TEM) and X-ray diffraction (XRD). XRD patterns of both nanoparticles showed peaks of magnetite (Fe3O4), maghemite (Fe2O3) and wustite (FeO). BET analysis indicated that surface area and pore volume of BS-FeONPs were 85.705 m²/g and 0.287 cm³/g, respectively, with an average diameter of 44.770 Å. While in the case of CS-FeONPs, surface area, pore volume and mean diameter were 71.645 m²/g, 0.32 cm³/g and 90.744 Å, respectively. High-resolution TEM images showed that both nanomaterials formed cubic, spherical and irregular shapes with particle size of 4.8 nm in case of BS-FeONPs and 9.07 nm in the case of CS-FeONPs. Adsorption data for both BS-FeONPs and CS-FeONPs complies with Langmuir isotherm equation model (R² = 0.99) and the maximum adsorption amount (qmax) was 29.14 and 19.08 mg/g for BS-FeONPs and CS-FeONPs, respectively. Kinetic studies revealed that adsorption of MB is rapid and complies with the pseudo-second-order kinetic (R² > 0.99).
- Subjects
IRON oxide nanoparticles; BIOSYNTHESIS; CHEMICAL synthesis; METHYLENE blue; IRON oxides; LANGMUIR isotherms; FERRIC oxide
- Publication
Desalination & Water Treatment, 2021, Vol 224, p354
- ISSN
1944-3994
- Publication type
Article
- DOI
10.5004/dwt.2021.27053