Efficient removal of atrazine from aqueous solutions using magnetic Saccharomyces cerevisiae bionanomaterial
A novel bionanomaterial comprising Saccharomyces cerevisiae ( S. cerevisiae ) and Fe 3 O 4 nanoparticles encapsulated in a sodium alginate-polyvinyl alcohol (SA-PVA) matrix was synthesized for the efficient removal of atrazine from aqueous solutions. The effects of the operating parameters, nitrogen...
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Veröffentlicht in: | Applied microbiology and biotechnology 2018-09, Vol.102 (17), p.7597-7610 |
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Hauptverfasser: | , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A novel bionanomaterial comprising
Saccharomyces cerevisiae
(
S. cerevisiae
) and Fe
3
O
4
nanoparticles encapsulated in a sodium alginate-polyvinyl alcohol (SA-PVA) matrix was synthesized for the efficient removal of atrazine from aqueous solutions. The effects of the operating parameters, nitrogen source, and glucose and Fe
3+
contents on atrazine removal were investigated, and the intermediates were detected by gas chromatography-mass spectrometry (GC-MS). In addition, the synthesized Fe
3
O
4
particles were characterized by XRD, EDX, HR-TEM, FTIR, and hysteresis loops, and the bionanomaterial was characterized by SEM. The results showed that the maximum removal efficiency of 100% was achieved at 28 °C, a pH of 7.0, and 150 rpm with an initial atrazine concentration of 2.0 mg L
−1
and that the removal efficiency was still higher than 95.53% even when the initial atrazine concentration was 50 mg L
−1
. Biodegradation was demonstrated to be the dominant removal mechanism for atrazine because atrazine was consumed as the sole carbon source for
S. cerevisiae
. The results of GC-MS showed that dechlorination, dealkylation, deamination, isomerization, and mineralization occurred in the process of atrazine degradation, and thus, a new degradation pathway was proposed. These results indicated that this bionanomaterial has great potential for the bioremediation of atrazine-contaminated water. |
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ISSN: | 0175-7598 1432-0614 |
DOI: | 10.1007/s00253-018-9143-x |