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Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/2440

Title: Photooxidation of wool dye and TCP in aqueous solution using an innovative TiO₂mesh electrode
Authors: Li, Xiang-zhong
Yue, Ping-to
Mak, Chee-leung
Subjects: Anodic oxidation
Titanium dioxide
Photoelectrocatalytic oxidation
Wool dye
Trichlorophenol
Issue Date: 2000
Publisher: IWA Publishing
Citation: Water science and technology, 2000, v. 42, no. 12, p. 181-188.
Abstract: An innovative titanium dioxide (TiO₂) mesh electrode was prepared by anodisation, in which 0.5 M sulphuric acid was used as electrolyte and titanium (Ti) metal mesh was anodised in a two stage anodic process. The innovated mesh electrode was examined using Raman spectroscopy to determine the formation of TiO₂layer when different potentials of 120 V, 140 V, 160 V, and 180 V were applied in anodisation. Microporous surface of the electrode was also examined using scanning electron microscopy. The photocatalytic (PC) oxidation and photoelectrocatalytic (PEC) oxidation were studied using the new electrode for treating synthetic wastewater solutions of dye and trichlorophenol (TCP) respectively. The colour removal efficiency of 68% was achieved using the 160V-mesh electrode for treating wool dye solution after 80minutes reaction time. However, it was found that a significant substrate adsorption on the surface of the mesh electrode could not be avoided when pH was below pH[sub IEP] of TiO₂=6.3. In this condition, electrostatic adsorption occurred between the anionic substrate molecules and positively charged TiO₂surface. The adsorbed substrate anion occupied most active sites of TiO₂on the mesh electrode surface and significantly reduced the performance efficiency of photo-oxidation, when the TiO₂mesh electrode was reused. The experiment demonstrated that TCP adsorption on the mesh electrode could be significantly eliminated, when pH of TCP solution was adjusted to above 7. When raising pH in TCP photodegradation eliminated substrate adsorption, it was confirmed that PC oxidation with application of a potential bias could enhance the photo-oxidation rate and a repeatable photo-oxidation rate could be maintained when the same mesh electrode was reused in its following tests.
Rights: © IWA Publishing 2000. The definitive peer-reviewed and edited version of this article is published in Water Science and Technology, v.42, no.12, p.181-188, 2000 and is available at www.iwapublishing.com.
Type: Journal/Magazine Article
URI: http://hdl.handle.net/10397/2440
ISSN: 0273-1223
Appears in Collections:CEE Journal/Magazine Articles

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