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

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...

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Main Authors: Ibrahim Gaya, Umar, Abdullah, Abdul Halim, Zainal, Zulkarnain, Hussein, Mohd. Zobir
Format: Article
Language:English
English
Published: Canadian Center of Science and Education (CCSE) 2010
Online Access:http://psasir.upm.edu.my/id/eprint/16185/1/Photocatalytic%20degradation%20of%202.pdf
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author Ibrahim Gaya, Umar
Abdullah, Abdul Halim
Zainal, Zulkarnain
Hussein, Mohd. Zobir
author_facet Ibrahim Gaya, Umar
Abdullah, Abdul Halim
Zainal, Zulkarnain
Hussein, Mohd. Zobir
author_sort Ibrahim Gaya, Umar
collection UPM
description 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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spelling upm.eprints-161852015-09-28T02:28:35Z http://psasir.upm.edu.my/id/eprint/16185/ Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension. Ibrahim Gaya, Umar Abdullah, Abdul Halim Zainal, Zulkarnain Hussein, Mohd. Zobir 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. Canadian Center of Science and Education (CCSE) 2010-02 Article PeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/16185/1/Photocatalytic%20degradation%20of%202.pdf 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 English
spellingShingle Ibrahim Gaya, Umar
Abdullah, Abdul Halim
Zainal, Zulkarnain
Hussein, Mohd. Zobir
Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension.
title Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension.
title_full Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension.
title_fullStr Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension.
title_full_unstemmed Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension.
title_short Photocatalytic degradation of 2,4-dichlorophenol in irradiated aqueous ZnO suspension.
title_sort photocatalytic degradation of 2 4 dichlorophenol in irradiated aqueous zno suspension
url http://psasir.upm.edu.my/id/eprint/16185/1/Photocatalytic%20degradation%20of%202.pdf
work_keys_str_mv AT ibrahimgayaumar photocatalyticdegradationof24dichlorophenolinirradiatedaqueousznosuspension
AT abdullahabdulhalim photocatalyticdegradationof24dichlorophenolinirradiatedaqueousznosuspension
AT zainalzulkarnain photocatalyticdegradationof24dichlorophenolinirradiatedaqueousznosuspension
AT husseinmohdzobir photocatalyticdegradationof24dichlorophenolinirradiatedaqueousznosuspension