NDLI: Impacts of dyebath auxiliaries on the reductive discoloration of Acid Orange 7 dye by high-carbon iron filings.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Kumar, Raja Sinha, Alok
Description	Author Affiliation: Kumar R ( Department of Environmental Science & Engineering, Indian School of Mines, Dhanbad 826004, Jharkhand, India E-mail: aloksinha11@yahoo.com.); Sinha A ( Department of Environmental Science & Engineering, Indian School of Mines, Dhanbad 826004, Jharkhand, India E-mail: aloksinha11@yahoo.com.)
Abstract	This study proposed that the physicochemical effects of common dyebath auxiliaries on the bulk dye solution as well as on the iron surface can influence the reductive discoloration of effluent containing Acid Orange 7 (AO7) dye using high-carbon iron filings. Sodium chloride increased the discoloration rate because of the pitting corrosion on the iron surface, triggered by chloride anion. 'Salting out' effect of ammonium sulfate improved the reaction rate up to a certain concentration, beyond which it could compete with dye molecules for the reactive sites, as revealed by formed sulfite and sulfide. Urea drastically reduced the discoloration rates by its chaotropic effect on the bulk solution and by wrapping around the iron surface. Organic acids, namely acetic acid and citric acid, stimulated iron corrosion to improve the discoloration rates. The discoloration reaction was biphasic with an initial fast reaction phase, where in every case more than 70% discoloration was observed within 5 min of reaction, preceding a slow reaction phase. The experimental data could be well described using biphasic kinetics equation (R(2)> 0.997 in all cases) and a biphasic equation was developed considering the individual impact of co-existing auxiliaries on AO7 discoloration.
File Format	HTM / HTML
ISSN	02731223
Issue Number	5
Journal	Water Science & Technology
Volume Number	74
e-ISSN	19969732
Language	English
Publisher	IWA Publishing
Publisher Date	2016-01-01
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Content Type	Text
Resource Type	Article
Subject	Environmental Engineering Water Science and Technology

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