Biosynthesis of Flower-Shaped CuO Nanostructures and Their Photocatalytic and Antibacterial Activities
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ARTICLE
https://doi.org/10.1007/s40820-019-0357-y
Biosynthesis of Flower‑Shaped CuO Nanostructures and Their Photocatalytic and Antibacterial Activities
Cite as Nano-Micro Lett. (2020) 12:29
Hafsa Siddiqui1 *, M. S. Qureshi2, Fozia Zia Haque2 * Hafsa Siddiqui, [email protected] Department of Physics, Sha-Shib College of Science and Management, Bhopal 462030, India 2 Optical Nanomaterial Lab, Department of Physics, Maulana Azad National Institute of Technology, Bhopal 462003, India
Received: 21 October 2019 Accepted: 5 December 2019 © The Author(s) 2020
1
HIGHLIGHTS • Eugenol (4-allyl-2-methoxyphenol) extracted from O. sanctum leaves is used as a natural reducing agent for the synthesis of CuO nanoflowers (NFs). • CuO-NFs can degrade methylene blue with an efficiency of 90%. • CuO-NFs offer a new vision to deactivate multi-drug microorganisms.
A B S T R AC T C o p -
MB dye degradation
per oxide nanoflowers
S
(CuO-NFs) have been synthesized through a
N
novel green route using
Light source
O2
co
In
Tulsi leaves-extracted
m
eugenol (4-allyl-2-meth-
O2
g
in lig ht
oxyphenol) as reducing
e− e− e− e− e−
agent. Characterizations
CB
results reveal the growth of crystalline single-
O
O OH
CuO-NFs H
monoclinic structure.
O
H
O
H
O
Cl−
+ N
H
CO2 Harmless Products
Bacteria
H
h+ h+ h+ h+ h+
The prepared CuO-NFs
H
H2O
CB
VB
phase CuO-NFs with
can effectively degrade
N
organic pollutants
Dead bacteria H+
methylene blue with 90% efficiency. They
Inactivation of bacteria
also show strong barrier
against E. coli (27 ± 2 mm) at the concentration of 100 µg mL−1, while at the concentration of 25 µg mL−1 weak barrier has been found against all examined bacterial organisms. The results provide important evidence that CuO-NFs have sustainable performance in methylene blue degradation as well as bacterial organisms. KEYWORDS Copper oxide; O. Sanctum; Eugenol; Biosynthesis; Photocatalysis; Antibacterial
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13
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1 Introduction The micro-/nanostructure studies demand a better understanding of crystal facet engineering with tailored architecture that can be attained by the new design and facile synthesis methods [1–3]. In the past few decades, cupric oxide (CuO) is intensively studied binary transition metal oxide [4]. CuO nanostructures with large surface areas and potential size-effects possess superior physical and chemical properties that remarkably differ from those of their microor bulk counterparts [5]. It has excellent architectures with different shapes and dimensions, such as zero-dimensional (0D) nanoparticles, one-dimensional (1D) nanotubes, 1D nanowires/rods, two-dimensional (2D) nanoplates, 2D nanolayers as well as several complex three-dimensional (3D) nanoflowers, urchin-like and spherical-like nanostructures [6, 7]. These nanostructures have been extensively used in various applications such as solar cells [8], photodetectors [9], field emissions [10], lithium-ion batteries (LIBs) [11], magnetic storage media [12], energetic m
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