Research articles
ScienceAsia 52 (2023): 1-10 |doi:
10.2306/scienceasia1513-1874.2023.018
Preparation of Fe3O4@SiO2@NH2-FLX magnetic
nanomaterials and investigation of their ability to capture
Gram-negative and Gram-positive bacteria
Yang Jinchuana, Peng Yuanyuana, Fu Huaa,*, Tao Lixiab
ABSTRACT: Magnetic nanomaterials are widely used in microbial enrichment due to their magnetic response and
biocompatibility. However, in high-salinity environments, they tend to agglomerate, impairing dispersion. To improve
microbial adsorption in such conditions, this study used a solvothermal method to synthesize Fe3
O4
nanoparticles
coated with SiO2
and modified with amino (?NH2
)andfleroxacin (-FLX) groups, creating Fe3
O4
@SiO2
@NH2-FLX. The
ability of the nanomaterial to capture Staphylococcus aureus and Escherichia coli, its adsorption behavior, kinetics, and
thermodynamics were evaluated. Confirmed by SEM, XRD, XPS, FT-IR, and VSM, the nanomaterial showed maximum
adsorption for E. coli and S. aureus at 4 and 15 min, with efficiencies of 97% and 95%, respectively. Under optimal
conditions, it outperformed unmodified and mono-aminated nanomaterials, achieving over 95% capture in Qarhan Salt
Lake brine. Cyclic tests showed 80% efficiency after five cycles. In real saline samples, it retained about 90% efficiency
for halophilic bacteria. Overall, this dual-functionalized nanoparticle offers significant advantages for removing bacteria
from aquatic environments.
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| a |
College of Chemical Engineering, Qinghai University, Xining 810016 China |
| b |
Zhejiang Boshi Hua Environmental Protection Technology Co., Ltd. (Group), Zhejiang 310015 China |
* Corresponding author, E-mail: 1171299733@qq.com
Received 11 Sep 2025, Accepted 2 Feb 2026
|
