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RISS 인기검색어
- 검색키워드
- 저자 : Pung Swee Yong (검색결과 4 건)
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Rhodomine B dye removal and inhibitory effect on B. subtilis and S. aureus by WOx nanoparticles
Yuet Lee Ying,Swee-Yong Pung,Ming Thong Ong,Yuh-Fen Pung 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.67 No.-
Visible-light-driven wide bandgap semiconductor photocatalysts were commonly developed via doping or coupling with another narrow bandgap metal oxide. However, these approaches required extra processing. The aim of study was to evaluate the photocatalytic performance of narrow bandgap WOx nanoparticles. A mixture of WO2 and WO3 nanoparticles were synthesized using solution precipitation technique. The photodegradation of RhB by these nanoparticles more effective in UV light than in visible light. In antibacterial susceptibility assay, WOx nanoparticles demonstrated good antibacterial against Gram-positive bacteria. The cell wall of bacterial was the main determinant in antibacterial effect other than W4+/W6+ ions and ROS.
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Highly UV light driven WOx@ZnO nanocomposites synthesized by liquid impregnation method
Myo Thuya Thein,Jia Ern Chim,Swee-Yong Pung,Yuh-Fen Pung 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Highly UV driven WOx@ZnO nanocomposites were synthesized by liquid impregnation (LI) method. Thepresence of WOx particles on the surface of ZnO nanorods were verified by TEM and EDX mapping. Inaddition, the XPS analysis shows that the WOx nanoparticles were a mixture of WO2 and WO3nanoparticles. The photocatalytic enhancement of WOx@ZnO nanocomposites in degrading RhB dyeunder UV light suggests that deposition of WOx could have pro-longed the separation of electrons(in WOx) from the holes. More holes were able to diffuse to the surface of photocatalyst and directlyoxidized the RhB dye molecules into less harmful by-products.
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Siti Nor Qurratu Aini Abd Aziz,Koe Chee Meng,Swee-Yong Pung,Zainovia Lockman,Anwar Ul-Hamid,Wai Kian Tan 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.118 No.-
Immobilization of photocatalysts on supporting substrates to prevent the loss and deterioration of photocatalyticperformances is an issue to be addressed by researchers. However, the common synthesistechniques such as chemical vapour deposition, sol-gel, or hydrothermal are time- and cost inefficient. A lot of heat is loss to environment when the heat generated outside the reactor is transferring intothe reactor and precursor solution. In this work, ZnO nanorods were grown on kanthal wires using directheating (DH) technique. DH technique offers many advantages as compared to common synthesis techniquessuch as chemical vapor deposition, sol–gel and hydrothermal to produce ZnO nanorods. The heatwas generated directly on the substrate itself, providing effective heating, low electric consumption(0.060 kWh), and rapid synthesis (15 min) of ZnO nanorods. The presence of ZnO nanorods on kanthalwires are verified by XRD, FESEM, TEM/HRTEM, XPS and RTPL analyses. The ZnO nanorods demonstratedgood photocatalytic performance in degradation of RhB dye and heavy metal ions under UV light. Thus,DH is a potential synthesis technique for mass production of wastewater treatment module.
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Soh Fanny Chiat Orou,Kee Jeik Hang,Myo Thuya Thien,Ying Yuet Lee,Le Cheng Foh,Nguyen Duong Ngoc Diem,Goh Boon Hee,Pung Swee Yong,Pung Yuh Fen 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.62 No.-
Many studies suggested that waste water treatment using metal oxide nanoparticles, in particular the zinc oxide nanoparticles, appears to be an economical and efficient solution. However, antibacterial activities reported from various research groups were often confusing and contradicting. The present study aimed to evaluate the antibacterial effects and the underlying mechanisms on the custom-engineered Zinc oxice (ZnO) nanorods and ZnO nanodisks. Firstly, antibacterial activities of ZnO nanorods and ZnO nanodisks were studied on both Gram positive and Gram negative bacteria. The antibacterial performance of these ZnO nanoparticles were bench marked with titanium dioxide nanoparticles (TiO2). In antibacterial susceptibility assay, both types of ZnO nanoparticles showed potent inhibition on Bacillus subtilis (B. subtilis) and Staphylococcus aureus (S. aureus) with minimal inhibitory concentration (MIC) at 128 and 256 ug/ml, respectively. Nevertheless, no inhibition was found against Gram negative bacteria. Interestingly, no inhibition was found against both Gram positive and Gram negative bacteria for TiO2 nanoparticles, and thus TiO2 nanoparticles were omitted in the subsequent study. In the time-kill kinetics assay, the inhibitory effect of both types of ZnO nanoparticles on B. subtilis was significant as early as 90 min after treatment at 128 μg/ml. Besides different types of bacteria, generation of reactive oxygen species (ROS), surface area, surface charges, polarity were also examined. Our study suggested that the antibacterial effects of ZnO nanorods and ZnO nanodisks were mediated through not one but multiple chemical and physical properties of nanoparticles. This is the first report introducing a new concept on ‘Nanotoxicity Threshold’, i.e. the maximal tolerance level in bacteria before any damage manifested. Our study warrants that a more holistic view on the mechanistic insights of nanoparticles is required to minimize adverse health effect on human.
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