Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 157, Issue 2-3, Pages 541-546Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2008.01.050
Keywords
azo dye; low frequency; Fenton's reaction; cast iron; mineralization
Categories
Funding
- National Key Basic Research and Development Program of China [2004CB418505]
- Bureau of Science and Technology of Shenyang Municipality
Ask authors/readers for more resources
The degradation of azo dye C.I. Acid Red 14 (AR14) was investigated using cast iron in the absence and presence of low frequency ultrasound (59kHz). The effects of pH, amount of cast iron ([Fe](0)) and initial concentration of AR14 ([dye]) on the degradation of AR14 by cast iron combined with low frequency ultrasound had been assessed. The degradation followed the first-order kinetics model. The first-order rate constant of AR14 degradation by cast iron was 7.50 x 10(-2) min(-1) while that by US-cast iron was 2.58 x 10(-1) min(-1). A 3.4-fold increase in the reaction rate was observed in the presence of ultrasound compared with that of absence of ultrasound. This kinetic effect is quantitatively accounted for a simple kinetic model based on the reaction of Fe(II) from cast iron in aqueous solution with sonochemically produced H2O2 (Fenton's reaction). This latter effect illustrates a simple way of achieving a substantial improvement in the efficiency of sonochemical degradation reactions. It was found that for azo dye AR14, the rate of color decay was the first order with respect to the visible absorption of the dye. The destruction of the naphthalene rings in azo dyes was slower than that of color. A significant mineralization of AR14 was observed. (C) 2008 Elsevier B.V. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available