Degradation and formation of wood odorant ¦Â-cyclocitral during permanganate oxidation

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• 作者：Ke-jia  ; Zhang^a ; Nai-yun  ; Gao^a ; Hung-Kai  ; Yen^b ; Yi-Ting  ; Chiu^b ; Tsair-Fuh  ; Lin^b ;   ; ^{tflin@mail.ncku.edu.tw}
• 关键词：¦Â-Carotene ; ¦Â-Cyclocitral ; Microcystis ; Oxidation ; Permanganate
• 刊名：Journal of Hazardous Materials
• 出版年：2011
• 出版时间：30 October 2011
• 年：2011
• 卷：194
• 期：Complete
• 页码：362-368
• 全文大小：425 K

文摘

The effect of permanganate oxidation on the formation and degradation of wood odorant ¦Â-cyclocitral in water was investigated. Oxidation experiments were conducted for ¦Â-cyclocitral prepared from pure chemicals and extracted from Microcystis aeruginosa. The data were simulated with appropriate kinetic rate models. The formation and degradation of ¦Â-cyclocitral during the oxidation of ¦Â-carotene were also monitored and modeled. The degradation of ¦Â-cyclocitral prepared from pure chemicals followed second-order kinetics with a rate constant of 91.7 ¡À 2.4 M^? s^?, and that of the ¦Â-cyclocitral precursor, ¦Â-carotene, followed first-order kinetics with a rate constant of 0.0054 ¡À 0.0004 min^?. During the oxidation of ¦Â-carotene, ¦Â-cyclocitral was produced. The formation and degradation can both be simulated by first-order kinetics with respect to ¦Â-carotene and ¦Â-cyclocitral concentrations, respectively. The degradation rate of ¦Â-cyclocitral produced from ¦Â-carotene was found to be much slower than that for ¦Â-cyclocitral obtained from pure chemicals, very likely due to a mass transfer limitation. The kinetic models were further employed to simulate the oxidation of ¦Â-cyclocitral in the presence of ¦Â-carotene and for ¦Â-cyclocitral extracted from M. aeruginosa, respectively. The models well predict/fit the experimental data, with rate constants similar to other experiments, indicating that the models may be used for simulating the formation and degradation of ¦Â-cyclocitral in water treatment systems.