Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582663 | Journal of Hazardous Materials | 2009 | 7 Pages |
Abstract
The kinetics of degradation of nitrobenzene in aqueous solution was investigated in the processes of ozone alone, ozone/ceramic honeycomb (CH), ozone/modified ceramic honeycomb (MCH). The results indicated that all reactions followed the pseudo-first-order kinetic model, and the degradation rate of nitrobenzene was accelerated in the presence of CH or MCH catalyst, and the more pronounced degradation rate was achieved in O3/MCH system. Under the experimental conditions of reaction temperature 293 K and initial pH 6.87, the rate constants were determined to be 5.21 Ã 10â2 minâ1 for O3 alone, 7.99 Ã 10â2 minâ1 for O3/CH and 15.45 Ã 10â2 minâ1 for O3/MCH. The influencing factors, such as applied ozone concentration (0.987-2.732 mg Lâ1), initial concentration of nitrobenzene (50-250 μg Lâ1) and amount of catalyst (0-5 blocks) could yield respectively the positive effect on the pseudo-first-order rate constants for degradation of nitrobenzene in the three processes mentioned above. The results suggested that the modification process promoted the catalytic activity of raw CH catalyst, namely the impregnation of metals (Mn, Cu and K) maybe enhance the initiation of hydroxyl radical (OH).
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Health and Safety
Authors
Lei Zhao, Jun Ma, Zhi-zhong Sun, Xue-dong Zhai,