Visible light-induced photocatalytic and antibacterial activity of TiO2/polyaniline-kapok fiber nanocomposite

2021 ◽  
Author(s):  
Rontgen B. Gapusan ◽  
Mary Donnabelle L. Balela
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Kapok Fiber

scholarly journals Controlling Antibacterial Activity Exclusively with Visible Light: Introducing a Tetra‐ortho‐Chloro‐Azobenzene Amino Acid

2021 ◽  
Author(s):  
Xavier Just-Baringo ◽  
Alejandro Yeste-Vázquez ◽  
Javier Moreno-Morales ◽  
Clara Ballesté-Delpierre ◽  
Jordi Vila ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Amino Acid ◽  
Visible Light

scholarly journals Visible Light-Induced Superior Photocatalytic Activity of Ag@Nd2WO6/ZnO Nanocomposite and its Biological Activity

2019 ◽  
Vol 9 (2S2) ◽  
pp. 232-236
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Uv Light ◽  
Uv Spectroscopy ◽  
Photocatalytic Process ◽  
Spectroscopy Technique ◽  
Phase Purity ◽  
X Ray ◽  
Uv Light Irradiation ◽  
Catalytic Material

In this work, degradation of Ciprofloxacin has been studied over the catalyst Ag@Nd2WO6/ZnO (ANWZ) synthesized via hydrothermal method. The catalysts are characterized with techniques such as X-ray diffractometer, Scanning electron microscope with EDX spectroscopy and DRS- UV spectroscopy respectively. For the results shows, the PXRD spectroscopy was confirmed a phase purity and crystalline structure of the as-synthesized catalyst. The SEM results are explained about the morphology structure of the material, the structure spherical with nanorod like clustered morphology structure was shown in SEM and the reacting elements in the catalytic material are confirmed by EDX spectroscopy. And the DRS-UV spectroscopy technique is telling about the band energy value for prepared materials and also select the suitable way (i.e: Visible or UV light irradiation) for the degradation. The photocatalytic process, Ciprofloxacin (CIP) drug are degraded under visible light within 140 minutes and the degradation efficiency are 95.54%. The reusability test explains the efficiency and stability of the ANWZ catalyst and its stable up to the fifth run. Further, the photodegradation process, the catalyst is tested antibacterial activity study against Bacillus cereus and Escherichia Coli bacterial organisms. From the result, Bacillus bacteria contain more efficient antibacterial activity than that of E.coli bacteria

scholarly journals Enhanced Antibacterial Activity of Silver Doped Titanium Dioxide-Chitosan Composites under Visible Light

Materials ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1403 ◽  
Author(s):  
Jie Li ◽  
Bing Xie ◽  
Kai Xia ◽  
Yingchun Li ◽  
Jing Han ◽  
...  
Keyword(s):  
Particle Size ◽  
Antibacterial Activity ◽  
Titanium Dioxide ◽  
Visible Light ◽  
Silver Ions ◽  
Antibacterial Activities ◽  
Nano Tio2 ◽  
Inverse Emulsion ◽  
Potential Applications

Nano titanium dioxide (TiO2) with photocatalytic activity was firstly modified by diethanolamine, and it was then doped with broad spectrum antibacterial silver (Ag) by in situ method. Further, both Ag doped TiO2-chitosan (STC) and TiO2-chitosan (TC) composites were prepared by the inverse emulsion cross-linking reaction. The antibacterial activities of STC composites were studied and their antibacterial mechanisms under visible light were investigated. The results show that in situ doping and inverse emulsion method led to good dispersion of Ag and TiO2 nanoparticles on the cross-linked chitosan microsphere. The STC with regular particle size of 1–10 μm exhibited excellent antibacterial activity against E. coli, P. aeruginosa and S. aureus under visible light. It is believed that STC with particle size of 1–10 μm has large specific surface area to contact with bacterial cell wall. The increased antibacterial activity was attributed to the enhancement of both electron-hole separations at the surface of nano-TiO2 by the silver ions under the visible light, and the synergetic and sustained release of strong oxidizing hydroxyl radicals of nano-TiO2, together with silver ions against bacteria. Thus, STC composites have great potential applications as antibacterial agents in the water treatment field.

scholarly journals Visible-Light-Induced Bactericidal Activity of a Nitrogen-Doped Titanium Photocatalyst against Human Pathogens

2006 ◽  
Vol 72 (9) ◽  
pp. 6111-6116 ◽  
Author(s):  
Ming-Show Wong ◽  
Wen-Chen Chu ◽  
Der-Shan Sun ◽  
Hsuan-Shun Huang ◽  
Jiann-Hwa Chen ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Bactericidal Activity ◽  
Uv Light ◽  
Shigella Flexneri ◽  
Light Illumination ◽  
Human Pathogens ◽  
Carbon Doped ◽  
Nitrogen Doped ◽  
Visible Light Illumination

ABSTRACT The antibacterial activity of photocatalytic titanium dioxide (TiO2) substrates is induced primarily by UV light irradiation. Recently, nitrogen- and carbon-doped TiO2 substrates were shown to exhibit photocatalytic activities under visible-light illumination. Their antibacterial activity, however, remains to be quantified. In this study, we demonstrated that nitrogen-doped TiO2 substrates have superior visible-light-induced bactericidal activity against Escherichia coli compared to pure TiO2 and carbon-doped TiO2 substrates. We also found that protein- and light-absorbing contaminants partially reduce the bactericidal activity of nitrogen-doped TiO2 substrates due to their light-shielding effects. In the pathogen-killing experiment, a significantly higher proportion of all tested pathogens, including Shigella flexneri, Listeria monocytogenes, Vibrio parahaemolyticus, Staphylococcus aureus, Streptococcus pyogenes, and Acinetobacter baumannii, were killed by visible-light-illuminated nitrogen-doped TiO2 substrates than by pure TiO2 substrates. These findings suggest that nitrogen-doped TiO2 has potential application in the development of alternative disinfectants for environmental and medical usages.

Synthesis of Anatase Se/Te-TiO2Nanorods with Dominant {100} Facets: Photocatalytic and Antibacterial Activity Induced by Visible Light

ChemPlusChem ◽  
2013 ◽  
Vol 78 (4) ◽  
pp. 302-309 ◽  
Author(s):  
Zong-Hong Lin ◽  
Prathik Roy ◽  
Zih-Yu Shih ◽  
Chung-Mao Ou ◽  
Huan-Tsung Chang
Keyword(s):  
Antibacterial Activity ◽  
Visible Light

scholarly journals Hierarchical CuO/ZnO Membranes for Environmental Applications under the Irradiation of Visible Light

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Zhaoyang Liu ◽  
Hongwei Bai ◽  
Darren Delai Sun
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Zno Nanorods ◽  
Cuo Nanoparticles ◽  
Environmental Applications ◽  
Utilization Rate ◽  
Zno Nanorod ◽  
Hierarchical Nanostructure ◽  
Light Utilization ◽  
Zno Nanomaterials

Solar visible light is a source of clean and cheap energy. Herein, a new kind of hierarchical CuO/ZnO nanomaterial was synthesized using a facile process. Characterized by FESEM, TEM, XRD, XPS, and so forth, this CuO/ZnO naomaterial shows a special hierarchical nanostructure with CuO nanoparticles grown on ZnO nanorods. By assembling the hierarchical CuO/ZnO nanomaterials on a piece of commercial glassfiber membrane, a novel hierarchical CuO/ZnO membrane was fabricated. This CuO/ZnO membrane demonstrated excellent environmental applications, such as improved photodegradation of contaminants and antibacterial activity, under the irradiation of visible light. Compared with pure ZnO nanorod membrane, the improved photodegradation and antibacterial capacities of this hierarchical CuO/ZnO membrane result from the special hierarchical nanostructure of CuO/ZnO nanomaterials, which could enhance light utilization rate, enlarge specific surface area, and retard the recombination of electrons and holes at the interfacial between CuO and ZnO. This hierarchical CuO/ZnO membrane is also easy to be regenerated by completely mineralizing the adsorbed contaminants under the irradiation of visible light. All the above characteristics of this hierarchical CuO/ZnO membrane indicate its great potential in environmental applications with solar visible light.

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