Particularities of photocatalysis and formation of reactive oxygen species on insulators and semiconductors: cases of SiO2, TiO2 and their composite SiO2–TiO2

2018 ◽  
Vol 8 (21) ◽  
pp. 5657-5668 ◽  
Author(s):  
Crina Anastasescu ◽  
Catalin Negrila ◽  
Daniel G. Angelescu ◽  
Irina Atkinson ◽  
Mihai Anastasescu ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Photocatalytic Activity ◽  
Reactive Oxygen ◽  
Oxygen Species

Highly defected tubular SiO2 outperforms the photocatalytic activity of TiO2-P25 and the SiO2–TiO2 composite.

TiO2/(BiO)2CO3 nanocomposites for ultraviolet filtration with reduced photocatalytic activity

2018 ◽  
Vol 6 (21) ◽  
pp. 5639-5650 ◽  
Author(s):  
Kathrin Bogusz ◽  
Moeava Tehei ◽  
Michael Lerch ◽  
Shi X. Dou ◽  
Hua K. Liu ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Photocatalytic Activity ◽  
Ultraviolet Radiation ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Subsequent Formation

TiO2 nanoparticles are typically used in sunscreens; however, they have been shown to exhibit cyto- and genotoxicity, which is related to the photocatalytic activity and the subsequent formation of reactive oxygen species when exposed to ultraviolet radiation.

Generation of reactive oxygen species and charge carriers in plasmonic photocatalytic Au@TiO2 nanostructures with enhanced activity

2018 ◽  
Vol 20 (23) ◽  
pp. 16117-16125 ◽  
Author(s):  
Weiwei He ◽  
Junhui Cai ◽  
Xiumei Jiang ◽  
Jun-Jie Yin ◽  
Qingbo Meng
Keyword(s):  
Reactive Oxygen Species ◽  
Photocatalytic Activity ◽  
Reactive Oxygen ◽  
Charge Carriers ◽  
Significant Enhancement ◽  
Core Shell ◽  
Oxygen Species ◽  
Shell Nanostructures ◽  
Enhanced Activity ◽  
Tio2 Nanostructures

Plasmonic Au@TiO2 core/shell nanostructures exhibit significant enhancement in the generation of ROS, charge carriers and photocatalytic activity.

scholarly journals Photocatalysis: Effect of Light-Activated Nanoscale Formulations of TiO2 on Xanthomonas perforans and Control of Bacterial Spot of Tomato

2013 ◽  
Vol 103 (3) ◽  
pp. 228-236 ◽  
Author(s):  
Mathews L. Paret ◽  
Gary E. Vallad ◽  
Devron R. Averett ◽  
Jeffrey B. Jones ◽  
Stephen M. Olson
Keyword(s):  
Reactive Oxygen Species ◽  
Photocatalytic Activity ◽  
Disease Incidence ◽  
Reactive Oxygen ◽  
Field Trials ◽  
Molecular Structures ◽  
Oxygen Species ◽  
Bacterial Spot ◽  
Xanthomonas Perforans

Protection of crops from bacterial diseases presents a continuing challenge, mandating the development of novel agents and approaches. Photocatalysis is a process where chemically reactive oxygen species are catalytically generated by certain minerals in the presence of light. These reactive oxygen species have the capacity to destroy organic molecular structures critical to pathogen viability. In this study, the antibacterial potential of photocatalytic nanoscale titanium dioxide (TiO2), nanoscale TiO2 doped (incorporation of other materials into the structure of TiO2) with silver (TiO2/Ag), and nanoscale TiO2 doped with zinc (TiO2/Zn; AgriTitan) was evaluated against Xanthomonas perforans, the causal agent for bacterial spot disease of tomato. In vitro experiments on photocatalytic activity and dose dependency were conducted on glass cover slips coated with the nanoscale formulations by adding a known population of X. perforans strain Xp-F7 and illuminating the cover slips under a visible light source. TiO2/Ag and TiO2/Zn had high photocatalytic activity against X. perforans within 10 min of exposure to 3 × 104 lux. Greenhouse studies on naturally and artificially infected transplants treated with TiO2/Zn at ≈500 to 800 ppm significantly reduced bacterial spot severity compared with untreated and copper control. Protection was similar to the grower standard, copper + mancozeb. The use of TiO2/Zn at ≈500 to 800 ppm significantly reduced disease incidence in three of the four trials compared with untreated and copper control, and was comparable to or better than the grower standard. The treatments did not cause any adverse effects on tomato yield in any of the field trials.

The influence of the morphology of 1D TiO2 nanostructures on photogeneration of reactive oxygen species and enhanced photocatalytic activity

2019 ◽  
Vol 281 ◽  
pp. 59-69 ◽  
Author(s):  
Maibelin Rosales ◽  
Tamara Zoltan ◽  
Ciro Yadarola ◽  
Edgar Mosquera ◽  
Francisco Gracia ◽  
...  
Keyword(s):  
Reactive Oxygen Species ◽  
Photocatalytic Activity ◽  
Reactive Oxygen ◽  
Oxygen Species ◽  
Tio2 Nanostructures
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