File Download

There are no files associated with this item.

  • Find it @ UNIST can give you direct access to the published full text of this article. (UNISTARs only)
Related Researcher

이창하

Lee, Changha
Read More

Views & Downloads

Detailed Information

Cited time in webofscience Cited time in scopus
Metadata Downloads

Application of photoactivated periodate to the decolorization of reactive dye: reaction parameters and mechanism

Author(s)
Lee, ChanghaYoon, J
Issued Date
2004-07
DOI
10.1016/j.jphotochem.2004.02.018
URI
https://scholarworks.unist.ac.kr/handle/201301/8138
Fulltext
http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=3042840957
Citation
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, v.165, no.1-3, pp.35 - 41
Abstract
The decolorization of the reactive dye, reactive black 5 (RB5), by the photoactivated periodate (UV/IO4 -) was investigated under ultraviolet (UV) irradiation at 254 nm, and its possible mechanism based on periodate photochemistry was discussed, in order to elucidate the main oxidants involved in the decolorization of RB5 as the reaction parameters, such as the light intensity, periodate concentration, dissolved oxygen, and solution pH, were varied, with the intermittent employment of an •OH scavenger. The decolorization rate of RB5 increased linearly with increasing light intensity. The decolorization rate was found to increase at low periodate concentrations (0-5 mM), but slightly decrease at higher concentrations (>5 mM). Dissolved oxygen did not have any measurable effect on the decolorization rate of the reactive dye. No pH dependence of the decolorization rate was observed over the pH range of 1.5-10, regardless of the periodate speciation. Based on these results, the main oxidants responsible for the RB5 decolorization with UV 254 were found to be •OH and IO3 • (IVI•), after considering the six intermediate species which are reported to be produced as a result of periodate photolysis, namely the radical species (•OH, IO3 •, and IO4 •;) and the non-radical species (O3, IO4 -, and IO3 -).
Publisher
ELSEVIER SCIENCE SA
ISSN
1010-6030

qrcode

Items in Repository are protected by copyright, with all rights reserved, unless otherwise indicated.