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KMID : 1024520070160040393
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Journal of the Environmental Sciences
2007 Volume.16 No. 4 p.393 ~ p.397
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Sonolytical Decomposition of NHCs in Aqueous Solution
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Yoo Young-Eok
Maeda Yasuaki
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Abstract
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The sonolytic decomposition of NHCs(Nitrogen Heterocyclic Compounds), such as atrazine[6-chloro-N-ethyl-N’-(1-methylethyl)-1,3,5-triazine-2,4-diamine], simazine(6-chloro-N,N’-diethyl-1,3,5-triazine-2,4-diamine), trietazine(6-chloro-N,N,N’-triethyl-1,3, 5-triazine-2,4-diamine), in water was investigated at a ultrasound frequency of 200kHz with an acoustic intensity of 200W under argon and air atmospheres. The concentration of NHCs decreased with irradiation, indicating pseudo-first-order kinetics. The rates were in the range under air and under argon at a concentration of of NHCs. The rate of hydroxyl radicals() formation from water is under argon and under air in the same sonolysis conditions. The sonolysis of NHCs is effectively inhibited, but not completely, by the addition of t-BuOH(2-methyl-2-propanol), which is known to be an efficient radical scavenger in aqueous sonolysis. This suggests that the main decomposition of NHCs proceeds via reaction with radical; a thermal reaction also occurs, although its contribution is small. The addition of appropriate amounts of Fenton’s reagent accelerates the decomposition. This is probably due to the regeneration of radicals from hydrogen peroxide, which would be formed from recombination of radicals and which may contribute a little to the decomposition.
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KEYWORD
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Decomposition, NHCs, Hydroxyl radicals, Fenton’s reagent, Thermal reaction, Ultrasonic irradiation
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