Oxidative degradation and associated mineralization of catechol, hydroquinone and resorcinol catalyzed by birnessite

被引:66
作者
Chien, S. W. Chang [1 ]
Chen, H. L. [2 ]
Wang, M. C. [1 ]
Seshaiah, K. [1 ]
机构
[1] Chaoyang Univ Technol, Dept Environm Engn & Management, Wufong Township 41349, Taichung County, Taiwan
[2] Natl Chung Hsing Univ, Dept Soil & Environm Sci, Taichung 40227, Taiwan
关键词
Catechol; Hydroquinone; Resorcinol; delta-MnO2; Oxidative degradation; CO2; PHOTOCATALYTIC DEGRADATION; PHENOLIC-COMPOUNDS; MANGANESE OXIDES; AQUEOUS-SOLUTION; KINETICS; REDUCTION; CLEAVAGE; GLYCINE; METAL;
D O I
10.1016/j.chemosphere.2008.10.007
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Abiotic degradation and mineralization of catechol, hydroquinone, and resorcinol catalyzed by birnessite (delta-MnO2) 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 CO2 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-MnO2 in presence of air expressed by CO2 release was catechol > hydroquinone >= resorcinol and the differences were significant. However, under an N-2 atmosphere the amounts Of CO2 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-MnO2 were also determined to elucidate the catalytic efficacy mediated by both O-2 and delta-MnO2 in the reaction systems. (C) 2008 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1125 / 1133
页数:9
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