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- Publisher
- Wiley
- Copyright
- Copyright © 2010 Wiley Subscription Services, Inc., A Wiley Company
- ISSN
- 1001-604X
- eISSN
- 1614-7065
- DOI
- 10.1002/cjoc.201090141
- Publisher site
- See Article on Publisher Site
Abstract
The kinetics and mechanism studies, for the reduction of methylene green (MG) by urea, in acidic and alkali media, were studied at λmax=652.8 nm by monitoring the depletion in MG concentration. The reaction was carried out by UV radiation, with variable dye concentration, reducing agent (urea), acid and base under different additive ions that are very common in dye waste water. The reduction followed pseudo first‐order kinetics with respect to different anions, cations, dye, reductant and OH− ion concentrations. It was found that most of the cations tested showed the inhibitory effect on dye decoloration, due to the formation of insoluble precipitate and followed the order K+>Na+>Al3+>Ca2+≈Mg2+. Tested anions showed that the dye decoloration was significantly accelerated and followed the order Cl−>Br−>I−>NO−3>SO2−4. A mechanistic model involving generation of a complex of dye with ions was proposed.
Journal
Chinese Journal of Chemistry – Wiley
Published: May 1, 2010
Keywords: ; ; ; ; ;