Green Synthesis of Fe <sub>3</sub> O <sub>4</sub> Nanoparticles Using Tea Leaf Extract for Polyacrylamide Adsorption
ABSTRACT Magnetic Fe 3 O 4 nanoparticles (Fe 3 O 4 NPs) were synthesized via a green method using Camellia sinensis leaf extract as a reducing and stabilizing agent. The obtained superparamagnetic nanoparticles exhibited a saturation magnetization of ∼50 emu/g and an average crystallite size of ∼20 nm, formed at 180°C over 8 h. These nanoparticles were applied as adsorbents for polyacrylamide (PAM) removal from aqueous solutions. Adsorption followed a pseudo‐second‐order kinetic model and fitted the Langmuir isotherm, with optimal conditions at pH 8, 50 min contact time, and 1.5 g/L dosage, achieving 99% removal efficiency. The Fe 3 O 4 NPs were easily recovered using an external magnetic field, highlighting their potential as low‐cost, eco‐friendly, and reusable adsorbents for water treatment applications.
Authors
- Huy Hoang Nguyen (ORCID: https://orcid.org/0000-0001-5354-4288)
- Xuan Nui Pham (ORCID: https://orcid.org/0000-0002-7469-3001)
- Hoa Thi Nguyen (ORCID: https://orcid.org/0000-0003-1824-4997)
- Thao Thi-Phuong Nguyen
Institutions
- Hanoi University of Mining and Geology (VN)
- Phenikaa University (VN)
- Vietnam Academy of Science and Technology (VN)
Publication Details
- Journal
- Chemical Engineering & Technology
- Published
- 2025-12-01
- DOI
- https://doi.org/10.1002/ceat.70135
- Primary Topic
- Adsorption and biosorption for pollutant removal
- Type
- article
- Field-Weighted Citation Impact
- 0.00