Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal

Waste water treatment using wide bandgap semiconductor particles, in particular the ZnO nanoparticles, is one of the alternative and economical approach. However, the photodegradation of organic pollutants by ZnO nanoparticles is relatively poor due to fast recombination of photogenerated electron-h...

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Main Author:	Ying, Yuet Lee
Format:	Thesis
Language:	English
Published:	2018
Subjects:	T Technology
Online Access:	http://eprints.usm.my/56064/1/Synthesis%20Of%20ZnO%20Nanomaterials%2C%20WOx%20Nanoparticles%20And%20WOxZnO%20Nanocomposites%20For%20Inhibition%20Of%20Bacterial%20Growth%20And%20Organic%20Dyes%20Removal_Ying%20Yuet%20Lee.pdf
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spelling	my-usm-ep.560642022-12-21T02:47:17Z Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal 2018-12-01 Ying, Yuet Lee T Technology TN Mining Engineering. Metallurgy Waste water treatment using wide bandgap semiconductor particles, in particular the ZnO nanoparticles, is one of the alternative and economical approach. However, the photodegradation of organic pollutants by ZnO nanoparticles is relatively poor due to fast recombination of photogenerated electron-holes. In addition, the antibacterial activities reported from various research groups were often confusing and contradicting. The present study aimed to improve the photocatalytic performance of ZnO nanoparticles from the morphology and coupling perspectives. In this project, the ZnO submicron rods (46.19 %) demonstrated better photodegradation efficiency than ZnO nanodisks (21.47 %) after 75 minutes of ultraviolet light irradiation. The photodegradation efficiency of ZnO submicron rods was improved slightly by depositing narrow bandgap semiconductor (WOx nanoparticles). The photodegradation efficiency of WOx/ZnO nanocomposites achieved 48.38 % under UV irradiation. These nanoparticles were tested for their antibacterial activity using antibacterial susceptibility assay without and with UV light irradiation. Based on the results, both ZnO submicron rods and WOx/ZnO nanocomposites displayed better antibacterial performance against Gram-positive bacteria (Bacillus subtilis and Staphylococcus aureus) than Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa), the effectiveness of inhibition on bacteria by these particles were bacteria-type dependent, and only Escherichia coli was sensitive to the presence of WO3. 2018-12 Thesis http://eprints.usm.my/56064/ http://eprints.usm.my/56064/1/Synthesis%20Of%20ZnO%20Nanomaterials%2C%20WOx%20Nanoparticles%20And%20WOxZnO%20Nanocomposites%20For%20Inhibition%20Of%20Bacterial%20Growth%20And%20Organic%20Dyes%20Removal_Ying%20Yuet%20Lee.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	T Technology T Technology
spellingShingle	T Technology T Technology Ying, Yuet Lee Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal
description	Waste water treatment using wide bandgap semiconductor particles, in particular the ZnO nanoparticles, is one of the alternative and economical approach. However, the photodegradation of organic pollutants by ZnO nanoparticles is relatively poor due to fast recombination of photogenerated electron-holes. In addition, the antibacterial activities reported from various research groups were often confusing and contradicting. The present study aimed to improve the photocatalytic performance of ZnO nanoparticles from the morphology and coupling perspectives. In this project, the ZnO submicron rods (46.19 %) demonstrated better photodegradation efficiency than ZnO nanodisks (21.47 %) after 75 minutes of ultraviolet light irradiation. The photodegradation efficiency of ZnO submicron rods was improved slightly by depositing narrow bandgap semiconductor (WOx nanoparticles). The photodegradation efficiency of WOx/ZnO nanocomposites achieved 48.38 % under UV irradiation. These nanoparticles were tested for their antibacterial activity using antibacterial susceptibility assay without and with UV light irradiation. Based on the results, both ZnO submicron rods and WOx/ZnO nanocomposites displayed better antibacterial performance against Gram-positive bacteria (Bacillus subtilis and Staphylococcus aureus) than Gram-negative bacteria (Escherichia coli and Pseudomonas aeruginosa), the effectiveness of inhibition on bacteria by these particles were bacteria-type dependent, and only Escherichia coli was sensitive to the presence of WO3.
format	Thesis
qualification_level	Master's degree
author	Ying, Yuet Lee
author_facet	Ying, Yuet Lee
author_sort	Ying, Yuet Lee
title	Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal
title_short	Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal
title_full	Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal
title_fullStr	Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal
title_full_unstemmed	Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal
title_sort	synthesis of zno nanomaterials, wox nanoparticles and wox/zno nanocomposites for inhibition of bacterial growth and organic dyes removal
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Kejuruteraan Bahan dan Sumber Mineral
publishDate	2018
url	http://eprints.usm.my/56064/1/Synthesis%20Of%20ZnO%20Nanomaterials%2C%20WOx%20Nanoparticles%20And%20WOxZnO%20Nanocomposites%20For%20Inhibition%20Of%20Bacterial%20Growth%20And%20Organic%20Dyes%20Removal_Ying%20Yuet%20Lee.pdf
_version_	1776101127683571712

Synthesis Of ZnO Nanomaterials, WOx Nanoparticles And WOx/ZnO Nanocomposites For Inhibition Of Bacterial Growth And Organic Dyes Removal

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