Synergy of ozonation and photocatalysis to mineralize low concentration 2,4-dichlorophenoxyacetic acid in aqueous solution

被引:50
作者
Giri, Rabindra Raj
Ozaki, Hiroaki
Ishida, Takehiro
Takanami, Ryohei
Taniguchi, Shogo
机构
[1] Osaka Sangyo Univ, New Ind R&D Ctr, Daito City, Osaka 5748530, Japan
[2] Osaka Sangyo Univ, Dept Civil Engn, Daito City, Osaka 5748530, Japan
关键词
aromatic intermediates; dechlorination; degradation; rate constant; TOC removal;
D O I
10.1016/j.chemosphere.2006.08.007
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Concentration of 2,4-dichlorophenoxyacetic acid (2,4-D) may affect its degradation kinetics in advanced oxidation systems, and combinations of two or more systems can be more effective for its mineralization at low concentration levels. Degradations and mineralizations of 0.045 mM 2,4-D using O-3, O-3/UV, UV/TiO2 and O-3/UV/TiO2 systems were compared, and influence of reaction temperature on the mineralization in O-3/UV/TiO2 system was investigated. 2,4-D degradations by O-3, O-3/UV and UV/TiO2 systems were similar to the results of earlier investigations with higher 2,4-D concentrations. The degradations and total organic carbon (TOC) removals in the four systems were well described by the first-order reaction kinetics. The degradation and removal were greatly enhanced in O-3/UV/TiO2 system, and further enhancements were observed with larger 03 supplies. The enhancements were attributed to hydroxyl radical ((OH)-O-.) generation from more than one reaction pathway. The degradation and removal in O-3/UV/TiO2 system were very efficient with reaction temperature fixed at 20 degrees C. It was suspected that reaction temperature might have influenced (OH)-O-. generation in the system, which needs further attention. (c) 2006 Elsevier Ltd. All rights reserved.
引用
收藏
页码:1610 / 1617
页数:8
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