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Azo dye Acid Red 27 decomposition kinetics during ozone oxidation and adsorption processes

Title
Azo dye Acid Red 27 decomposition kinetics during ozone oxidation and adsorption processes
Authors
Beak M.H.Ijagbemi C.O.Kim D.S.
Ewha Authors
김동수
SCOPUS Author ID
김동수scopus
Issue Date
2009
Journal Title
Journal of Environmental Science and Health - Part A Toxic/Hazardous Substances and Environmental Engineering
ISSN
1093-4529JCR Link
Citation
vol. 44, no. 6, pp. 623 - 629
Indexed
SCI; SCIE; SCOPUS WOS scopus
Abstract
To elucidate the effects of ozone dosage, catalysts, and temperature on azo dye decomposition rate in treatment processes, the decomposition kinetics of Acid Red 27 by ozone was investigated. Acid Red 27 decomposition rate followed the first-order reaction with complete dye discoloration in 20 min of ozone reaction. The dye decay rate increases as ozone dosage increases. Using Mn, Zn and Ni as transition metal catalysts during the ozone oxidation process, Mn displayed the greatest catalytic effect with significant increase in the rate of decomposition. The rate of decomposition decreases with increase in temperature and beyond 40C, increase in decomposition rate was followed by a corresponding increase in temperature. The FT-IR spectra in the range of 1000-1800 cm-1 revealed specific band variations after the ozone oxidation process, portraying structural changes traceable to cleavage of bonds in the benzene ring, the sulphite salt group, and the C-N located beside the -N = N- bond. From the 1H-NMR spectra, the breaking down of the benzene ring showed the disappearance of the 10 H peaks at 7-8 ppm, which later emerged with a new peak at 6.16 ppm. In a parallel batch test of azo dye Acid Red 27 adsorption onto activated carbon, a low adsorption capacity was observed in the adsorption test carried out after three minutes of ozone injection while the adsorption process without ozone injection yielded a high adsorption capacity.
DOI
10.1080/10934520902784708
Appears in Collections:
엘텍공과대학 > 환경공학전공 > Journal papers
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