Formation of Nitrite and Hydrogen Peroxide in Water during the Vacuum Ultraviolet Irradiation Process: Impacts of pH, Dissolved Oxygen, and Nitrate Concentration

2021 ◽  
Vol 55 (3) ◽  
pp. 1682-1689
Author(s):  
Baiyang Chen ◽  
Yuanxi Huang ◽  
Qi Zhang ◽  
Dionysios D. Dionysiou ◽  
Lei Wang ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Dissolved Oxygen ◽  
Ultraviolet Irradiation ◽  
Vacuum Ultraviolet ◽  
Nitrate Concentration ◽  
Irradiation Process

scholarly journals Killing of Bacillus Spores by Aqueous Dissolved Oxygen, Ascorbic Acid, and Copper Ions

2003 ◽  
Vol 69 (4) ◽  
pp. 2245-2252 ◽  
Author(s):  
J. B. Cross ◽  
R. P. Currier ◽  
D. J. Torraco ◽  
L. A. Vanderberg ◽  
G. L. Wagner ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Ascorbic Acid ◽  
Dissolved Oxygen ◽  
Hydroxyl Radicals ◽  
Fenton Reaction ◽  
Copper Ions ◽  
Transition Metal Ions ◽  
Fenton Reagent ◽  
Bacillus Spores ◽  
Modified Fenton

ABSTRACT An approach to decontamination of biological endospores is discussed. Specifically, the performance of an aqueous modified Fenton reagent is examined. A modified Fenton reagent formulation of cupric chloride, ascorbic acid, and sodium chloride is shown to be an effective sporicide under aerobic conditions. The traditional Fenton reaction involves the conversion of hydrogen peroxide to hydroxyl radical by aqueous ionic catalysts such as the transition metal ions. Our modified Fenton reaction involves the conversion of aqueous dissolved oxygen to hydrogen peroxide by an ionic catalyst (Cu2+) and then subsequent conversion to hydroxyl radicals. Results are given for the modified Fenton reagent deactivating spores of Bacillus globigii. A biocidal mechanism is proposed that is consistent with our experimental results and independently derived information found in the literature. This mechanism requires diffusion of relatively benign species into the interior of the spore, where dissolved O2 is then converted through a series of reactions which ultimately produce hydroxyl radicals that perform the killing action.

scholarly journals Degradation of Aliphatic Polyesters by Vacuum Ultraviolet Irradiation

2006 ◽  
Vol 38 (4) ◽  
pp. 395-399 ◽  
Author(s):  
Yabin Li ◽  
Akiko Hayashi ◽  
Mizuho Saito ◽  
Martin Vacha ◽  
Shigemitsu Murase ◽  
...  
Keyword(s):  
Ultraviolet Irradiation ◽  
Vacuum Ultraviolet ◽  
Aliphatic Polyesters
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