Rapid photochemical decomposition of perfluorooctanoic acid mediated by a comprehensive effect of nitrogen dioxide radicals and Fe3+/Fe2+ redox cycle

2020 ◽  
Vol 388 ◽  
pp. 121730 ◽  
Author(s):  
Yijin Yuan ◽  
Lizhen Feng ◽  
Ning Xie ◽  
Lizhi Zhang ◽  
Jingming Gong
Keyword(s):  
Nitrogen Dioxide ◽  
Perfluorooctanoic Acid ◽  
Redox Cycle ◽  
Photochemical Decomposition

Spectroscopic studies of the hydrogen-oxygen explosion initiated by the flash photolysis of nitrogen dioxide

1952 ◽  
Vol 210 (1103) ◽  
pp. 439-460 ◽  
Keyword(s):  
Nitrogen Dioxide ◽  
Flash Photolysis ◽  
Spectroscopic Studies ◽  
Reaction Scheme ◽  
Oh Radical ◽  
Time Intervals ◽  
Induction Periods ◽  
Photochemical Decomposition ◽  
Explosive Reaction ◽  
Flash Spectroscopy

The method of flash photolysis has been used to initiate the reaction between hydrogen and oxygen, using a small amount of nitrogen dioxide as sensitizer. The dependence of the ignition limits on total pressure, capacity and the pressure of nitrogen dioxide have been studied, as well as the flash photochemical decomposition of nitrogen dioxide alone. The explosive reaction is complete in a few milliseconds, and very short induction periods are found whose duration can be explained in terms of the initial temperature rise. It is shown that the initiation of the explosion in this way is reproducible to less than 10 -4 s and flash spectroscopy is used to study the development of the reactions with time. The spectra obtained are described and the reactions of the OH radical are investigated by means of its absorption spectrum , whose intensity variations with partial pressure of hydrogen, oxygen, nitrogen and water vapour over time intervals of 0·2 ms throughout the reaction are given. Addition of hydrogen accelerates the reaction, but oxygen in excess has the same effect as an inert gas which is to decrease the rate. It is shown that the important propagation steps are exclusively bimolecular and the main reactions of the OH radical are identified. The mechanism of the overall explosion reaction is discussed and a reaction scheme is given which is in accordance with the results.

Nitrogen dioxide radicals mediated mineralization of perfluorooctanoic acid in aqueous nitrate solution with UV irradiation

Chemosphere ◽  
2017 ◽  
Vol 188 ◽  
pp. 367-374 ◽  
Author(s):  
Aimin Li ◽  
Zhe Zhang ◽  
Peifeng Li ◽  
Lejuan Cai ◽  
Lizhi Zhang ◽  
...  
Keyword(s):  
Nitrogen Dioxide ◽  
Uv Irradiation ◽  
Nitrate Solution ◽  
Perfluorooctanoic Acid ◽  
Aqueous Nitrate Solution

Photochemical decomposition of perfluorooctanoic acid in aqueous periodate with VUV and UV light irradiation

2010 ◽  
Vol 179 (1-3) ◽  
pp. 1143-1146 ◽  
Author(s):  
M.H. Cao ◽  
B.B. Wang ◽  
H.S. Yu ◽  
L.L. Wang ◽  
S.H. Yuan ◽  
...  
Keyword(s):  
Uv Light ◽  
Perfluorooctanoic Acid ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Photochemical Decomposition

scholarly journals Effect of pH and Coexisting Species on the Photochemical Decomposition of Perfluorooctanoic Acid by Iron (III) Sulphate

2012 ◽  
Vol 10 (2) ◽  
pp. 129-140 ◽  
Author(s):  
Masaki OHNO ◽  
Yuta KUBO ◽  
Esteban R Mino A ◽  
Tomohiro KOSE ◽  
Satoshi NAKAI ◽  
...  
Keyword(s):  
Perfluorooctanoic Acid ◽  
Effect Of Ph ◽  
Photochemical Decomposition ◽  
Coexisting Species

Photochemical decomposition of perfluorooctanoic acid mediated by iron in strongly acidic conditions

2014 ◽  
Vol 268 ◽  
pp. 150-155 ◽  
Author(s):  
Masaki Ohno ◽  
Masataka Ito ◽  
Ryouichi Ohkura ◽  
Esteban R. Mino A ◽  
Tomohiro Kose ◽  
...  
Keyword(s):  
Perfluorooctanoic Acid ◽  
Photochemical Decomposition ◽  
Acidic Conditions

Photochemical Decomposition of Environmentally Persistent Perfluorooctanoic Acid in Water

2006 ◽  
Vol 1 (3) ◽  
Author(s):  
Zhang Chaojie ◽  
Zhou Qi ◽  
Chen Ling ◽  
Yuan Yuan ◽  
Zhang Qian
Keyword(s):  
Ph Value ◽  
Uv Light ◽  
Bond Cleavage ◽  
Perfluorooctanoic Acid ◽  
Effective Technique ◽  
Photo Degradation ◽  
Factors Affecting ◽  
Uv Light Irradiation ◽  
Photochemical Decomposition ◽  
Zero Order Reaction

The photo-degradation of perfluorooctanoic acid (PFOA) in aqueous solution was preliminarily studied in this paper in order to develop an effective technique against the pollution of PFOA. Reaction kinetics and factors affecting the degradation were investigated. The results showed that PFOA could be degraded effectively into fluorine ion through UV light irradiation, which was the first example of C-F bond cleavage in PFOA induced by UV light; Ferric ion could promote the photo-degradation efficiency of PFOA in aqueous solutions at pH value 4.0, while adding TiO2 could not increase this photochemical reaction under our experimental condition; The dynamics analysis showed that photodecomposition of PFOA followed a pseudo-zero order reaction. The study indicated that photochemical decomposition was a highly promising technology for the removal of PFOA from wastewater.

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