Katsumata Hideyuki, Kaneco Satoshi, Suzuki Tohru, Ohta Kiyohisa, Yobiko Yoshihiro
Department of Chemistry for Materials, Graduate School of Engineering, Mie University, Tsu, Mie 514-8507, Japan.
Chemosphere. 2007 Oct;69(8):1261-6. doi: 10.1016/j.chemosphere.2007.05.054. Epub 2007 Jul 2.
2,3,7,8-Tetrachlorodibenzo-p-dioxin (2,3,7,8-TeCDD) was rapidly decreased by sonication in aqueous solution. The degradation efficiency was strongly influenced by ultrasonic power and reaction temperature. An initial 2,3,7,8-TeCDD concentration of 20 ng l(-1) was completely degraded within 60 min under sonochemical conditions using a 20 kHz frequency with a 150 W ultrasound power. The activation energy is 21.9 kJ/mol in the temperature range of 10-40 degrees C, suggesting a diffusion-controlled reaction. To increase the efficiency of 2,3,7,8-TeCDD treatment, degradation system combined ultrasound with Fe(III) (2 x 10(-4)mol l(-1)) and UV irradiation. Both UV and Fe(III) induced Fenton, Fenton-like and photo-Fenton reactions, leading to additional OH radicals and rapid 2,3,7,8-TeCDD removal.
2,3,7,8-四氯二苯并对二恶英（2,3,7,8-TeCDD）在水溶液中通过超声处理迅速降解。降解效率受超声功率和反应温度的强烈影响。在20 kHz频率和150 W超声功率的声化学条件下，初始浓度为20 ng l(-1)的2,3,7,8-TeCDD在60分钟内完全降解。在10-40摄氏度的温度范围内，活化能为21.9 kJ/mol，表明这是一个扩散控制的反应。为提高2,3,7,8-TeCDD的处理效率，降解系统将超声与Fe(III)（2×10(-4)mol l(-1)）和紫外线照射相结合。紫外线和Fe(III)都会引发芬顿、类芬顿和光芬顿反应，从而产生额外的羟基自由基并快速去除2,3,7,8-TeCDD。
