Structural, optical and antibacterial properties of zinc oxide nanoparticles synthesized via chemical and green synthesis methods
Zinc oxide nanoparticles (ZnONPs) are subjected to intense research due to their wide application in various fields such as electronics, solar cells and optics, and another impressive property. In terms of biological application, in wastewater treatment, chemical disinfection like c...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English |
| Published: |
2019
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/85190/1/ITMA%202019%207%20-%20ir.pdf |
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| Summary: | Zinc oxide nanoparticles (ZnONPs) are subjected to intense research due to their wide application
in various fields such as electronics, solar cells and optics, and another impressive
property. In terms of biological application, in wastewater treatment, chemical disinfection like
chlorination can respond with various components in natural water yielding to the by-product
formation that possibly hazardous to the environment which could harmfully affect human
health. Metal oxide nanoparticles can be one of the options to enhance the wastewater treatment
since it is partly neutral to water and not a strong oxidant. To reduce the use of
harmful chemicals and by-product formation in wastewater treatment, the use of plant
extract in the synthesis of nanoparticles are cost-effective and environmentally friendly.
Therefore, the ZnONPs and biogenic ZnONPs was successfully synthesized using chemical and
green synthesis method. The structural, optical and the antibacterial properties of both
ZnONPs and biogenic ZnONPs was revealed by characterization and antibacterial activity
against Escherichia coli bacteria. For structural properties, XRD test showed that both ZnONPs and
biogenic ZnONPs have a wurtzite structure as the peaks of zinc oxide (ZnO) dominated in (002)
plane. Then, the FESEM result revealed that the ZnO formed in a spherical shape and the
nanoparticles sizes measured is a range around 60 ± 12 nm - 24 ± 4 nm for both ZnONPs and biogenic
ZnONPs. For optical properties, the energy band gap obtained is between 3.33 – 3.37 eV. For ZnONPs
synthesis by chemical method, the antibacterial test discovered that ZnONPs prepared at pH 10 & 11
shows the significant inhibition compared to other pH values. Meanwhile, the biogenic ZnONPs at 0.1
M concentration exhibit the highest inhibition of E. coli bacteria due to their smallest size
of nanoparticles. The results obtained indicated that both ZnONPs and biogenic ZnONPs
exhibit the significant inhibition towards bacteria growth due to their great properties in
structural and
optical. |
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