Journal ArticleDOI
EPR Study of Visible Light-Induced ROS Generation by Nanoparticles of ZnO
TLDR
In this article, electron spin resonance measurements revealed that aqueous suspensions of small nanoparticles of ZnO produce increased levels of reactive oxygen species, namely hydroxyl radicals and singlet oxygen.Abstract:
Nanoparticles of ZnO have been shown to have marked antibacterial and anticancerous activities. The toxic effect of ZnO has been found to exist due to a reaction of the ZnO surface with water. In the present work electron-spin resonance measurements revealed that aqueous suspensions of small nanoparticles of ZnO produce increased levels of reactive oxygen species, namely hydroxyl radicals and singlet oxygen. Interestingly, a remarkable enhancement of the oxy radicals, was detected when the ZnO water suspension had been irradiated with blue (400−500 nm) light. The characterization of the mechanism of light-induced oxy radicals formation by ZnO nanoparticles would contribute to its use as a sterilization agent.read more
Citations
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Journal ArticleDOI
Review on Zinc Oxide Nanoparticles: Antibacterial Activity and Toxicity Mechanism.
Amna Sirelkhatim,Shahrom Mahmud,Azman Seeni,Noor Haida Mohamad Kaus,Ling Chuo Ann,Siti Khadijah Mohd Bakhori,Habsah Hasan,Dasmawati Mohamad +7 more
TL;DR: This review covered ZnO-NPs antibacterial activity including testing methods, impact of UV illumination,ZnO particle properties (size, concentration, morphology, and defects), particle surface modification, and minimum inhibitory concentration.
Journal ArticleDOI
Size-Dependent Bacterial Growth Inhibition and Mechanism of Antibacterial Activity of Zinc Oxide Nanoparticles
TL;DR: The experimental results suggest that ZnO nanoparticles could be developed as antibacterial agents against a wide range of microorganisms to control and prevent the spreading and persistence of bacterial infections.
Journal ArticleDOI
Ecotoxicity of manufactured ZnO nanoparticles – A review
TL;DR: These studies suggest relative high acute toxicity of ZnO NPs (in the low mg/l levels) to environmental species, although this toxicity is highly dependent on test species, physico-chemical properties of the material, and test methods.
Journal ArticleDOI
Insight into the Mechanism of Antibacterial Activity of ZnO: Surface Defects Mediated Reactive Oxygen Species Even in the Dark
TL;DR: It is conclusively proved that reactive oxygen species (ROS) such as (•)OH, ( •)O2(-), and H2O2 are significantly produced from aqueous suspension of ZnO even in thedark and are mainly responsible for the activity in the dark up to 17%, rather than Zn(2+) ion leaching as proposed earlier.
Journal ArticleDOI
Recent advances in nanomaterials for water protection and monitoring.
Rasel Das,Chad D. Vecitis,Agnes Schulze,Bin Cao,Ahmad Fauzi Ismail,Xianbo Lu,Jiping Chen,Seeram Ramakrishna +7 more
TL;DR: An exhaustive examination of current research trends with a focus on nanomaterials (NMs) to considerably improve the performance of classical wastewater treatment technologies, e.g. adsorption, catalysis, separation, and disinfection is undertaken.
References
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Titanium dioxide photocatalysis
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Photosensitized singlet oxygen and its applications
TL;DR: In this article, the photophysical properties of singlet molecular oxygen and of the photosensitizers used in its generation are examined and compared, with particular focus on its role in wastewater treatment, fine chemical synthesis, and photodynamic therapy.
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Antimicrobial nanomaterials for water disinfection and microbial control: Potential applications and implications
Qilin Li,Shaily Mahendra,Delina Y. Lyon,Lena Brunet,Michael V. Liga,Dong Li,Pedro J. J. Alvarez +6 more
TL;DR: The antimicrobial mechanisms of several nanoparticles are reviewed, their merits, limitations and applicability for water disinfection and biofouling control are discussed, and research needs to utilize novel nanomaterials for water treatment applications are highlighted.
Journal ArticleDOI
Metal Oxide Nanoparticles as Bactericidal Agents
TL;DR: In this paper, reactive magnesium oxide nanoparticles and halogen (Cl2, Br2) adducts of these MgO particles were allowed to contact certain bacteria and spore cells, which yield insight into the biocidal action of these nanoscale materials.
Journal ArticleDOI
Enhanced Antibacterial Activity of Nanocrystalline ZnO Due to Increased ROS-Mediated Cell Injury
Guy Applerot,Anat Lipovsky,Rachel Dror,Nina Perkas,Yeshayahu Nitzan,Rachel Lubart,Aharon Gedanken +6 more
TL;DR: It is apparent that the unique properties of small size and corresponding large specific surface area of small nanometer‐scale ZnO particles impose several effects that govern its antibacterial action that do not exist in the range of microscale particles.