Relationship between mineralization kinetics and mechanistic pathway during malic acid photodegradation.

Irawaty, Wenny, Friedmann, Donia, Scott, Jason and Amal, Rose (2011) Relationship between mineralization kinetics and mechanistic pathway during malic acid photodegradation. Journal of Molecular Catalysis A: Chemical, 335 (1-2). pp. 151-157. ISSN 1381-1169; Jurnal Internasional Bereputasi Q1, H-Index 132, Impact factor 2016: 4,211

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Abstract

The photocatalytic degradation of malic acid was studied under ambient conditions in an aqueous TiO2 suspension. The results demonstrated the presence of four distinct mineralization rate variations over the course of its degradation. Differences in the mineralization rate were governed by the dominant intermediate present in the solution at that time. Initial mineralization was rapid (∼175�g C/min) resulting from the swift extraction of a carbon from strongly adsorbed malic acid via the photo-Kolbe mechanism. The mineralization rate then slowed down (∼50–70�g C/min) with the continued formation of an intermediate product (believed to be malonaldehydic acid), malonic acid and acetic acid in the solution. The findings provide greater insight into the photocatalytic degradation mechanism, illustrating the importance of intermediates and their attributes in relation to the overall rate of organic removal.

Item Type:	Article
Additional Information:	Jurnal Internasional Bereputasi; Q1, H-Index 132 Impact factor 2016: 4,211
Uncontrolled Keywords:	Malic acid Photooxidation Kinetics Mineralization profile Mechanism
Subjects:	Engineering > Chemical Engineering
Divisions:	Journal Publication
Depositing User:	F.X. Hadi
Date Deposited:	08 May 2019 06:30
Last Modified:	08 Jul 2020 04:17
URI:	https://repository.ukwms.ac.id/id/eprint/18349

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