PMID: 16719115May 25, 2006

Ionizing radiation-induced destruction of benzene and dienes in aqueous media

Environmental Science & Technology
Mohamad Al-SheikhlyRobert E Huie

Abstract

Pulse radiolysis with spectrophotometric and conductometric detection was utilized to study the formation and reactions of radicals from benzene and dienes in aqueous solutions. The benzene OH adduct, *C6H6OH, reacts with O2 (k = 3 x 10(8) L mol(-1) s(-1)) in a reversible reaction. The peroxyl radical, HOC6H6O2*, undergoes O2*- elimination, bimolecular decay, and reaction with benzene to initiate a chain reaction, depending on the dose rate, benzene concentration, and pH. The occurrence of the chain reaction is demonstrated in low-dose-rate gamma radiolysis experiments where the consumption of O2 was monitored. 1,4-Cyclohexadiene, 1,4-hexadiene, and 1,4-pentadiene form OH-adducts and undergo H-abstraction by O*- radicals. The OH-adducts react with O2 to form peroxyl radicals. These peroxyl radicals, however, do not undergo unimolecular O2*- elimination but rather decay by second-order processes, which lead to subsequent steps of O2*- elimination.

Citations

Aug 7, 2010·Physical Chemistry Chemical Physics : PCCP·Sindy M DockheerWillem H Koppenol
Dec 17, 2014·Journal of Environmental Sciences (China)·Qiburi BaoJianlong Wang
Dec 10, 2009·International Journal of Radiation Biology·Nina Jeppesen EdinErik Olai Pettersen

Related Concepts

1,4-hexadiene
Cyclohexadiene
Pentadienes
Benzene
Cyclohexanes
Free Radicals
X-Rays, Nuclear
Hydrogen-Ion Concentration
Dioxygen
Pulse Radiolysis

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