Photodesorption of organic matter from titanium dioxide particles in aqueous media

El Saliby, I; Shahid, M; McDonagh, A; Shon, HK; Kim, JH

Photodesorption of organic matter from titanium dioxide particles in aqueous media

El Saliby, I

Shahid, M McDonagh, A

Shon, HK

Kim, JH

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Publication Type:: Journal Article
Citation:: Journal of Industrial and Engineering Chemistry, 2012, 18 (5), pp. 1774 - 1780
Issue Date:: 2012-09-25

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Field	Value	Language
dc.contributor.author	El Saliby, I https://orcid.org/0000-0003-4119-3198	en_US
dc.contributor.author	Shahid, M	en_US
dc.contributor.author	McDonagh, A https://orcid.org/0000-0002-9502-1175	en_US
dc.contributor.author	Shon, HK https://orcid.org/0000-0002-3777-7169	en_US
dc.contributor.author	Kim, JH	en_US
dc.date.issued	2012-09-25	en_US
dc.identifier.citation	Journal of Industrial and Engineering Chemistry, 2012, 18 (5), pp. 1774 - 1780	en_US
dc.identifier.issn	1226-086X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/22061
dc.description.abstract	Photo-induced desorption of organic compounds from TiO 2 particles in aqueous media during photocatalysis has promising applications in water treatment. Photodesorption is a relatively fast phenomenon that facilitates the regeneration of photocatalysts with low energy consumption while concentrating the waste products in an energy and water efficient process. We propose that this transport phenomenon involves a significantly reduced affinity between the photocatalyst and pollutants upon UV illumination, and leads to the rapid detachment/decomposition of adsorbed pollutants. In this study, we report the effect of experimental conditions (pH, photocatalyst loading, organic loading, UV light irradiation and flow rate) on this phenomenon in a recirculating photocatalysis continuous reactor. Initially, organic compounds were allowed to adsorb on the surface of the photocatalyst (Degussa P25) until adsorption equilibrium was achieved. The photodesorption phenomenon was observed shortly after UV-light illumination of TiO 2 but before the bulk photocatalytic oxidation takes place. The pH of the solution was found to affect both the adsorption and the desorption percentages revealing the role of particle charge on this phenomenon. Additionally, a 1g/L loading of photocatalyst showed an optimum photodesorption rate using a single strength synthetic wastewater at pH 7. © 2012.	en_US
dc.relation.ispartof	Journal of Industrial and Engineering Chemistry	en_US
dc.relation.isbasedon	10.1016/j.jiec.2012.04.002	en_US
dc.subject.classification	Polymers	en_US
dc.title	Photodesorption of organic matter from titanium dioxide particles in aqueous media	en_US
dc.type	Journal Article
utslib.citation.volume	5	en_US
utslib.citation.volume	18	en_US
utslib.for	0904 Chemical Engineering	en_US
utslib.for	0303 Macromolecular and Materials Chemistry	en_US
utslib.for	03 Chemical Sciences	en_US
utslib.for	09 Engineering	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Mathematical and Physical Sciences
pubs.organisational-group	/University of Technology Sydney/Strength - CCET - Centre for Clean Energy Technology
pubs.organisational-group	/University of Technology Sydney/Strength - CTWW - Centre for Technology in Water and Wastewater Treatment
utslib.copyright.status	closed_access
pubs.issue	5	en_US
pubs.publication-status	Published	en_US
pubs.volume	18	en_US

Abstract:

Photo-induced desorption of organic compounds from TiO 2 particles in aqueous media during photocatalysis has promising applications in water treatment. Photodesorption is a relatively fast phenomenon that facilitates the regeneration of photocatalysts with low energy consumption while concentrating the waste products in an energy and water efficient process. We propose that this transport phenomenon involves a significantly reduced affinity between the photocatalyst and pollutants upon UV illumination, and leads to the rapid detachment/decomposition of adsorbed pollutants. In this study, we report the effect of experimental conditions (pH, photocatalyst loading, organic loading, UV light irradiation and flow rate) on this phenomenon in a recirculating photocatalysis continuous reactor. Initially, organic compounds were allowed to adsorb on the surface of the photocatalyst (Degussa P25) until adsorption equilibrium was achieved. The photodesorption phenomenon was observed shortly after UV-light illumination of TiO 2 but before the bulk photocatalytic oxidation takes place. The pH of the solution was found to affect both the adsorption and the desorption percentages revealing the role of particle charge on this phenomenon. Additionally, a 1g/L loading of photocatalyst showed an optimum photodesorption rate using a single strength synthetic wastewater at pH 7. © 2012.

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http://hdl.handle.net/10453/22061