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Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension.


Ibrahim Gaya, Umar and Abdullah, Abdul Halim and Zainal, Zulkarnain and Hussein, Mohd. Zobir (2010) Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension. International Journal of Chemistry, 2 (1 ). pp. 180-193. ISSN 1916-9698


This paper focuses on the destruction of aqueous 2,4-dichorophenol in ZnO suspension irradiated by low wattage UV light at 299 K. The operating variables studied include initial 2,4-dichlorophenol concentration, photocatalyst doses and pH. At 1.5 g l-1 feed concentration of ZnO and 50 mg l-1 initial 2,4-dichlorophenol level, a complete degradation was achieved in 180 min. The decomposition kinetics with respect to 2,4-dichlorophenol approximates pseudo zero-order with rate constant peaking at 0.38 mg l-1 min-1. High performance liquid chromatography (HPLC) and gas chromatography-mass spectrometry (GC-MS) detected benzoquinone, 2-chlorohydroquinone, 4-chlorophenol, 3,5-dichlorocatechol, hydroquinone, 4-hydroxybenzaldehyde and phenol during the ZnO-assisted photodegradation of 2,4-dichlorophenol among which some pathway products are disclosed for the first time. The reaction mechanism accounting for the degradation pathway intermediates is proposed. Inorganic anion additives such as S2O8 2-, SO4 2-, Cland HPO4 2- manifested inhibition against 2,4-dichlorophenol removal.

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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
Publisher: Canadian Center of Science and Education (CCSE)
Keywords: 2,4-dichlorophenol; Intermediate; Photocatalysis; Anion; ZnO.
Depositing User: Najwani Amir Sariffudin
Date Deposited: 21 Aug 2013 07:30
Last Modified: 28 Sep 2015 02:28
URI: http://psasir.upm.edu.my/id/eprint/16185
Statistic Details: View Download Statistic

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