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標題: Oxidative degradation and associated mineralization of catechol, hydroquinone and resorcinol catalyzed by birnessite
作者: Chien, S.W.C.
Chen, H.L.
Wang, M.C.
Seshaiah, K.
關鍵字: Catechol;Hydroquinone;Resorcinol;delta-MnO(2);Oxidative degradation;CO(2);photocatalytic degradation;phenolic-compounds;manganese oxides;aqueous-solution;kinetics;reduction;cleavage;glycine;cells;soil
Project: Chemosphere
期刊/報告no:: Chemosphere, Volume 74, Issue 8, Page(s) 1125-1133.
Abiotic degradation and mineralization of catechol, hydroquinone, and resorcinol catalyzed by birnessite (delta-MnO(2)) Was investigated. Studies were carried out by monitoring changes of pE versus time and pH versus time of the reaction systems during the initial 10 h reaction period and release Of CO(2) and associated reactions at the end of a 90 h reaction period. The reactions under anoxic condition were compared with aeration condition. The reactions were carried out in suspensions at initial pH of 6.0 under air and N(2) atmosphere at room temperature and free of microbial activity. These results indicated that kinetic-related changes of pE versus time and pH versus time were dependent on structural characteristics of phenolic compound and aeration or anoxic condition in the reaction system. The sequence of the mineralization of phenolic compounds catalyzed by delta-MnO(2) in presence of air expressed by CO(2) release was catechol > hydroquinone >= resorcinol and the differences were significant. However, under an N(2) atmosphere the amounts Of CO(2) released were drastically reduced with insignificant differences among the three reaction systems. Further, phenolic compound degradations, dissolved and adsorbed Mn, and oxidation state of Mn in delta-MnO(2) were also determined to elucidate the catalytic efficacy mediated by both O(2) and delta-MnO(2) in the reaction systems. (C) 2008 Elsevier Ltd. All rights reserved.
ISSN: 0045-6535
DOI: 10.1016/j.chemosphere.2008.10.007
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