Sonochemical degradation of 2,3,7,8-tetrachlorodibenzo-p-dioxins in aqueous solution with Fe(III)/UV system

被引：28

作者：

Katsumata, Hideyuki ^{[1
]}

Kaneco, Satoshi

Suzuki, Tohru

Ohta, Kiyohisa

Yobiko, Yoshihiro

机构：

[1] Mie Univ, Grad Sch Engn, Dept Chem Mat, Tsu, Mie 5148507, Japan

[2] Mie Univ, Environm & Preservat Ctr, Tsu, Mie 5148507, Japan

[3] Environm Chem Grp, Technol Res Inst Osaka Prefecture, Osaka 5941157, Japan

来源：

CHEMOSPHERE | 2007年 / 69卷 / 08期

关键词：

2,3,7,8-tetrachlorodibenzo-p-dioxin; ultrasonic irradiation; Fenton reaction; hydroxyl radical;

D O I：

10.1016/j.chemosphere.2007.05.054

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

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 1(-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 U/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(111) (2 x 10(-4) Mol 1(-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. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：1261 / 1266

页数：6

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