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Enhanced bio-decolorization of azo dyes by quinone-functionalized ceramsites under saline conditions

Paper ID Volume ID Publish Year Pages File Format Full-Text
34936 45060 2012 7 PDF Available
Title
Enhanced bio-decolorization of azo dyes by quinone-functionalized ceramsites under saline conditions
Abstract

Anthraquinone-2-sulfonate was immobilized on ceramsites (AQS-ceramsites) using a novel adsorption/covalence coupling method and their effects on the anaerobic bio-decolorization rates of azo dyes by salt-tolerant AQS-reducing (STAR) community were investigated. The results showed that AQS-ceramsites mediated specific bio-decolorization rates of four azo dyes Acid Yellow 36, Reactive Red 2, Acid Red 27 and Acid Orange 7 increase 2.3–6.4 fold than those lacking ceramsites in the presence of 50 g/L NaCl. Moreover, repeated experiments with AQS-ceramsites showed that the decolorization efficiencies of azo dyes could remain over 98% of their original value. These results indicated that AQS-ceramsites functioning as redox mediators exhibited good catalytic activity and stability under saline conditions. The dynamics of the STAR community structure revealed by PCR-DGGE also showed that the presence of AQS-ceramsites made STAR bacteria keeping predominant in the catalytic system. Therefore, it can be concluded that this novel solid redox mediator is potentially useful for the treatment of saline dye wastewater.

► Anthraquinone-2-sulfonate (AQS) as a redox mediator could be immobilized on ceramsites. ► Immobilized AQS effectively increased the biodecolorization rates of azo dyes. ► During the decolorization of azo dyes, no dissolved AQS was observed.

Keywords
AQS-ceramsites; Decolorization; Azo dyes; Immobilization; Community dynamics
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Enhanced bio-decolorization of azo dyes by quinone-functionalized ceramsites under saline conditions
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Publisher
Database: Elsevier - ScienceDirect
Journal: Process Biochemistry - Volume 47, Issue 2, February 2012, Pages 312–318
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us