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Effective reduction of nitrophenols and colorimetric detection of Pb(<scp>ii</scp>) ions by <i>Siraitia grosvenorii</i> fruit extract capped gold nanoparticles
Effective reduction of nitrophenols and colorimetric detection of Pb(<scp>ii</scp>) ions by <i>Siraitia grosvenorii</i> fruit extract capped gold nanoparticles
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Date
2021
Authors
Van Thuan Le
Truong Giang Duong
Van Tan Le
Thanh Long Phan
Thi Lan Huong Nguyen
Tan Phat Chau
Van-Dat Doan
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Abstract
This study presents a simple and green approach for the synthesis of Siraitia grosvenorii fruit extract capped
gold nanoparticles (SG-AuNPs). The SG-AuNPs samples prepared under the optimized conditions were
characterized by various techniques (UV-Vis, XRD, FTIR, HR-TEM, EDX, DLS). The biosynthesized
nanoparticles were then studied for the reduction of 2-nitrophenol (2-NP) and 3-nitrophenols (3-NP)
and for colorimetric detection of Pb2+ ions. The characterization results revealed that the crystals of SGAuNPs
were spherical with an average size of 7.5 nm. The FTIR and DLS analyses proved the presence of
the biomolecule layer around AuNPs, which played an important role in stabilizing the nanoparticles. The
SG-AuNPs showed excellent catalytic activity in the reduction of 3-NP and 2-NP, achieving complete
conversion within 14 min. The catalytic process was endothermic and followed pseudo-first-order
kinetics. The activation energy was determined to be 10.64 and 26.53 kJ mol 1 for 2-NP and 3-NP,
respectively. SG-AuNPs maintained high catalytic performance after five recycles. The fabricated material
was also found to be highly sensitive and selective to Pb2+ ions with the detection limit of 0.018 mM in
a linear range of 0–1000 mM. The practicality of the material was validated through the analyses of Pb2+
in mimic pond water samples. The developed nanoparticles could find tremendous applications in
environmental monitoring.