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Reduction of Methylene Blue by Ascorbic Acid: Kinetic and Thermodynamic Aspects

Published/Copyright: May 18, 2013
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Abstract

This article reports the reduction of methylene blue (MB) by ascorbic acid (H2As) in basic aqueous and micellar solutions. Ascorbate ion (As2–) is found to be an effective reducing agent for the decolorization of methylene blue under ambient condition. Effects of salting-in and salting-out agents have been investigated for real-time application in the reduction process. The salting-in agent urea has been found to uniquely enhance the rate of the reduction of MB by As2– in the presence of micelles. Detailed kinetic and thermodynamic aspects have been considered to realize the interaction between methylene blue and ascorbate ion. Kinetic studies revealed that the reaction follows pseudo first order reaction kinetics.

Kurzfassung

In diesem Beitrag wird die Reduktion von Methylenblau (MB) durch Ascorbinsäure (H2As) im wässrigen basischen Millieu und mizellaren Lösungen behandelt. Das Ascorbation (As2–) ist ein effektives Reduktionsmittel für die Entfärbung von Methylenblau unter Umgebungsbedingungen. Die Wirkungen von „salting-in“ – und „salting-out“-Mitteln für die Echtzeitanwendung im Reduktionsprozess wurden untersucht. Es wurde gefunden, dass Harnstoff („salting-in“-Mittel) die Reduktionsgeschwindigkeit von MB durch As2– in Gegenwart von Mizellen einzigartig verstärkt. Detaillierte kinetische und thermodynamische Aspekte wurden geprüft, um die Wechselwirkungen zwischen Methylenblau und dem Ascorbationen zu erfassen. Die kinetischen Studien zeigten, dass die Reaktionskinetik Pseudo-Erster-Ordnung ist.


Correspondence to Hisham J. El-Aila, Department of Chemistry, Al-Aqsa University, P.O. Box 40 51; Gaza, P. N. A, Fax: +009 72-08-284 54 88, E-Mail:

Dr. Hesham J. Y. El-Aila born in 1963, studied at Islamic University – Gaza (Palestine), where he obtained his B. Sc in chemistry in 1986 and at Al-Nagah University in Nablus (Palestine), where he obtained his M. Sc in physical chemistry in 1989. In 2001 he obtained his Ph.D in physical chemistry from Ain-Shams University, Cairo (Egypt). He has been Assistant Professor in chemistry department at Al-Aqsa University – Gaza (Palestine) up to 2007. In September 2007 he has been Associated Professor in chemistry department at Al-Aqsa University – Gaza (Palestine) up to now


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Received: 2011-07-05
Published Online: 2013-05-18
Published in Print: 2012-01-01

© 2012, Carl Hanser Verlag, München

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