Recalcitrance of cyanuric acid to oxidative degradation by OH radical: theoretical investigation

RSC Advances ◽  
2014 ◽  
Vol 4 (70) ◽  
pp. 37359-37364 ◽  
Author(s):  
Guangyan Liu
Keyword(s):  
Theoretical Investigation ◽  
Cyanuric Acid ◽  
Oxidative Degradation ◽  
Oh Radical ◽  
Triazine Ring ◽  
Electron Deficiency

Electron deficiency of the triazine ring makes the reactions between cyanuric acid and OH radical energetically unfavorable.

Theoretical Investigation of the Reactions of CF3CHFOCF3with the OH Radical and Cl Atom

2010 ◽  
Vol 114 (1) ◽  
pp. 417-424 ◽  
Author(s):  
Xiujuan Jia ◽  
Youjun Liu ◽  
Jingyu Sun ◽  
Hao Sun ◽  
Zhongmin Su ◽  
...  
Keyword(s):  
Theoretical Investigation ◽  
Oh Radical ◽  
Cl Atom

Theoretical investigation on atmospheric oxidation of fluorene initiated by OH radical

2019 ◽  
Vol 669 ◽  
pp. 920-929 ◽  
Author(s):  
Zhezheng Ding ◽  
Yayi Yi ◽  
Qingzhu Zhang ◽  
Tao Zhuang
Keyword(s):  
Theoretical Investigation ◽  
Atmospheric Oxidation ◽  
Oh Radical

scholarly journals Molecular Basis of a Bacterial Consortium: Interspecies Catabolism of Atrazine

1998 ◽  
Vol 64 (1) ◽  
pp. 178-184 ◽  
Author(s):  
Mervyn L. de Souza ◽  
David Newcombe ◽  
Sam Alvey ◽  
David E. Crowley ◽  
Anthony Hay ◽  
...  
Keyword(s):  
Nitrogen Source ◽  
Southern Hybridization ◽  
Cyanuric Acid ◽  
Bacterial Species ◽  
Bacterial Consortium ◽  
Triazine Ring ◽  
Carbon And Nitrogen ◽  
Consortium Member ◽  
Ring Compounds ◽  
Pure Cultures

ABSTRACT Pseudomonas sp. strain ADP contains the genes,atzA, -B, and -C, that encode three enzymes which metabolize atrazine to cyanuric acid. Atrazine-catabolizing pure cultures isolated from around the world contain genes homologous to atzA, -B, and -C. The present study was conducted to determine whether the same genes are present in an atrazine-catabolizing bacterial consortium and how the genes and metabolism are subdivided among member species. The consortium contained four or more bacterial species, but two members, Clavibacter michiganese ATZ1 andPseudomonas sp. strain CN1, collectively mineralized atrazine. C. michiganese ATZ1 released chloride from atrazine, produced hydroxyatrazine, and contained a homolog to theatzA gene that encoded atrazine chlorohydrolase. C. michiganese ATZ1 stoichiometrically metabolized hydroxyatrazine to N-ethylammelide and contained genes homologous toatzB and atzC, suggesting that either a functional AtzB or -C catalyzed N-isopropylamine release from hydroxyatrazine. C. michiganese ATZ1 grew on isopropylamine as its sole carbon and nitrogen source, explaining the ability of the consortium to use atrazine as the sole carbon and nitrogen source. A second consortium member, Pseudomonassp. strain CN1, metabolized the N-ethylammelide produced byC. michiganese ATZ1 to transiently form cyanuric acid, a reaction catalyzed by AtzC. A gene homologous to the atzCgene of Pseudomonas sp. strain ADP was present, as demonstrated by Southern hybridization and PCR. Pseudomonassp. strain CN1, but not C. michiganese, metabolized cyanuric acid. The consortium metabolized atrazine faster than didC. michiganese individually. Additionally, the consortium metabolized a much broader set of triazine ring compounds than did previously described pure cultures in which the atzABCgenes had been identified. These data begin to elucidate the genetic and metabolic bases of catabolism by multimember consortia.

The fate of peroxyl radicals in aqueous solution

1997 ◽  
Vol 35 (4) ◽  
pp. 9-15 ◽  
Author(s):  
Clemens von Sonntag ◽  
Peter Dowideit ◽  
Fang Xingwang ◽  
Ralf Mertens ◽  
Pan Xianming ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Aromatic Compounds ◽  
Advanced Oxidation Processes ◽  
Room Temperature ◽  
Oxidative Degradation ◽  
High Reactivity ◽  
Peroxyl Radicals ◽  
Oh Radical ◽  
Oxidation Processes ◽  
Water And Wastewater

The reactions of peroxyl radicals occupy a central role in oxidative degradation. Under the term Advanced Oxidation Processes in drinking-water and wastewater processing, procedures are summarized that are based on the formation and high reactivity of the OH radical. These react with organic matter (DOC). With O2, the resulting carbon-centered radicals O2 give rise to the corresponding peroxyl radicals. This reaction is irreversible in most cases. An exception is hydroxycyclohexadienyl radicals which are formed from aromatic compounds, where reversibility is observed even at room temperature. Peroxyl radicals with strongly electron-donating substituents eliminate O2.−, those with an OH-group in a-position HO2.. Otherwise organic peroxyl radicals decay bimolecularly. The tetroxides formed in the first step are very short-lived intermediates and decay by various pathways, leading to molecular products (alcohols, ketones, esters and acids, depending on the precursor), or to oxyl radicals, which either fragment by scission of a neighbouring C-C bond or, when they carry an a-hydrogen, undergo a (water-assisted) 1,2-H-shift.

Controlling the electron-deficiency of self-assembling pyrazine-acenes: a collaborative experimental and theoretical investigation

2013 ◽  
Vol 15 (16) ◽  
pp. 5967 ◽  
Author(s):  
Lacie V. Brownell ◽  
Kyoungmi Jang ◽  
Kathleen A. Robins ◽  
Ich C. Tran ◽  
Clemens Heske ◽  
...  
Keyword(s):  
Theoretical Investigation ◽  
Self Assembling ◽  
Electron Deficiency

Effect of cyanuric acid amendment on atrazine mineralization in surface soils and detection of the s-triazine ring-cleavage gene trzD

2001 ◽  
Vol 33 (11) ◽  
pp. 1539-1545 ◽  
Author(s):  
Ellen B. Ostrofsky ◽  
Jayne B. Robinson ◽  
Samuel J. Traina ◽  
Olli H. Tuovinen
Keyword(s):  
Cyanuric Acid ◽  
Ring Cleavage ◽  
Triazine Ring ◽  
Surface Soils
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