Dynamics of oxidant addition as a parameter in the modelling of dye mineralization (Orange II) via advanced oxidation technologies

被引:59
作者
Bandara, J [1 ]
Nadtochenko, V [1 ]
Kiwi, J [1 ]
Pulgarin, C [1 ]
机构
[1] SWISS FED INST TECHNOL,INST ENVIRONM ENGN,CH-1015 LAUSANNE,SWITZERLAND
关键词
Orange II; concentrated solutions; mineralization; quantum yields; kinetics; product formation; modelling; pH dependence;
D O I
10.2166/wst.1997.0093
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Light and dark processes involving Fenton reagent are effective in the degradation of Orange II solutions. The degradation time is shown to be strongly dependent on the initial pH of the solution used. Experimental results show that the mineralization rates for Orange II become significant only at pH <-5. The H2O2 added and O-2 evolved were monitored during the degradation cycles allowing optimization for the times for oxidant addition. About 88% dye mineralization in 40 minutes under light irradiation. A model for the degradation has been developed from the available kinetic rates for radical reactions. The model predicts an H2O2 consumption time of -100 seconds consistent with the experimental results obtained. A turnover number of 4.7 was estimated for light induced processes in the model system used. Near surface radical formation is shown to be important during the observed photocatalysis. No activation energy was detected during the mineralization suggesting a radical mechanism for this reaction. (C) 1997 IAWQ. Published by Elsevier Science Ltd.
引用
收藏
页码:87 / 93
页数:7
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