Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9451795 | Chemosphere | 2005 | 8 Pages |
Abstract
Enhancement of p,pâ²-DDT photodegradation on soil surfaces using TiO2 induced by UV-light was mainly investigated in this work. After being spiked with p,pâ²-DDT, soil samples loaded with different doses of TiO2 (0%, 0.5%, 1%, 2%, and 3% wt) were exposed to UV-light irradiation for 24 h. The results indicated that the photodegradation of p,pâ²-DDT followed the pseudo-first-order kinetics. TiO2 accelerated the photodegradation of p,pâ²-DDT significantly as indicated by the half-life reduction from 23.3 h to 10.4 h, corresponding to the TiO2 content from 0% to 3% respectively. In addition, the effects of soil pH, photon flux and humic substances on p,pâ²-DDT degradation were investigated. The photodegradation rate increased with the increase of the soil pH and photon flux. The humic substances (2% wt) inhibited the p,pâ²-DDT photodegradation by reducing the amount of light available to excite the p,pâ²-DDT and TiO2 or by quenching radicals capable of oxidizing p,pâ²-DDT. p,pâ²-DDE, p,pâ²-DDD and DDMU were main degradation intermediates and they were further degraded in the presence of TiO2.
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Authors
Xie Quan, Xu Zhao, Shuo Chen, Huimin Zhao, Jingwen Chen, Yazhi Zhao,