Ozonation and carbon-assisted ozonation of methylene blue as model compound:Effect of solution pH
This work investigated the pH effect on ozonation and carbon-assisted ozonation processes,where methylene blue (MB) was employed as model compound.Kinetic study and quantitative description on reaction pathway,i.e.molecular ozone attack and hydroxyl radicals (HO·) oxidation,were accomplished to evaluate the effect of pH on process control for ozonation.The HO·reaction route for MB decolorization intensified with increasing pH and become even comparable to molecular ozonation as pH reached up to 11 (0=1.14),and this trend can also be reflected by comparative analysis of detected HO· species at different pH.Carbon nanotubes (CNTs) were selected as stable carbon material to investigate the pH effect on ozone/carbon systems.The mineralization of MB solution and concentration study of HO· both revealed that the performance of CNTs during ozonation depend much on solution pH.At basic environments consequently,CNTs began to perform as an effective ozone catalyst accelerating the generation of HO· oxidative species,where the formation of HO2-was thought to be the key promotive intermediate.
Ozonation Kinetics Mass transfer Carbon nanotubes Solution pH Hydroxyl radical
Shuo Zhang Dong Wang Shasha Zhang Xingwen Zhang Pingping Fan
Key Laboratory of Industrial Ecology and Environmental Engineering(MOE), School of Environmental Sci Dalian Waterwood Engineering Co.Ltd., Xingyun Street 1, Shahekou district, Dalian 116021, China
国际会议
2013 International Symposium on Environmental Science and Technology(2013环境科学与技术国际会议)
大连
英文
399-406
2013-06-04（万方平台首次上网日期，不代表论文的发表时间）