Degradation of methyl orange by UV, O3 and UV/O3 systems: analysis of the degradation effects and mineralization mechanism

Degradation of methyl orange by UV, O3 and UV/O3 systems: analysis of the degradation effects and... The effect of ultraviolet irradiation (UV), ozonation, and the combined UV/O3 systems on the decolorization and degradation of methyl orange, performed in a laboratory-scale reactor, was studied. Decoloration efficiency, UV–vis spectrum, chemical oxygen demand (COD), mass spectrum (MS), and total organic carbon (TOC) analyses were employed. Three oxidative processes including UV, ozonation (O3), and the combined UV/O3 system were assessed to select the most appropriate oxidative process in terms of methyl orange aqueous solution treatment and special emphasis was laid on the effect of reaction pH in the UV/O3 system. The results indicated that the pH value of methyl orange solution decreased with the treatment time, and it reached an acid value when oxidized for 150 min. The COD removal efficiencies of methyl orange were only 46.23 (UV), 44.54 (O3), and 71.17 % (UV/O3) in three processes, while the corresponding decolorization efficiencies were 94.8, 94.2, and 95.1 % after 150 min of treatment. The mineralization mechanism was suggested based on the analysis of the molecular structure of methyl orange, intermediate products, and final products by using MS. For the combined UV/O3 system, the basicity condition was good at the TOC removal. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Degradation of methyl orange by UV, O3 and UV/O3 systems: analysis of the degradation effects and mineralization mechanism

Loading next page...
 
/lp/springer_journal/degradation-of-methyl-orange-by-uv-o3-and-uv-o3-systems-analysis-of-iaJE4BMAan
Publisher
Springer Netherlands
Copyright
Copyright © 2012 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-012-0935-9
Publisher site
See Article on Publisher Site

Abstract

The effect of ultraviolet irradiation (UV), ozonation, and the combined UV/O3 systems on the decolorization and degradation of methyl orange, performed in a laboratory-scale reactor, was studied. Decoloration efficiency, UV–vis spectrum, chemical oxygen demand (COD), mass spectrum (MS), and total organic carbon (TOC) analyses were employed. Three oxidative processes including UV, ozonation (O3), and the combined UV/O3 system were assessed to select the most appropriate oxidative process in terms of methyl orange aqueous solution treatment and special emphasis was laid on the effect of reaction pH in the UV/O3 system. The results indicated that the pH value of methyl orange solution decreased with the treatment time, and it reached an acid value when oxidized for 150 min. The COD removal efficiencies of methyl orange were only 46.23 (UV), 44.54 (O3), and 71.17 % (UV/O3) in three processes, while the corresponding decolorization efficiencies were 94.8, 94.2, and 95.1 % after 150 min of treatment. The mineralization mechanism was suggested based on the analysis of the molecular structure of methyl orange, intermediate products, and final products by using MS. For the combined UV/O3 system, the basicity condition was good at the TOC removal.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Dec 6, 2012

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off