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https://hdl.handle.net/11499/4671
Title: | Bromate formation on the non-porous TiO2 photoanode in the photoelectrocatalytic system | Authors: | Selçuk, Hüseyin Sarikaya, H.Z. Bekbolet, M. Anderson, M.A. |
Keywords: | Bromate formation Bromine generation By-product Photoanode Photoelectrocatalytic Titanium dioxide Anodes Bromine Catalysis bromate bromine sodium bromide titanium dioxide photochemistry article chemical analysis chemical reaction concentration (parameters) electrode electrolysis illumination irradiation pH photocatalysis porosity steady state Bromates Disinfection Electrochemistry Electrodes Electrolysis Hydrogen-Ion Concentration Ozone Photochemistry Titanium Water |
Abstract: | The increasing use of ozone in water disinfection processes has been the focus of considerable concern in regards to inorganic disinfection by product formation of bromate in waters containing bromide. Due to the public health risk caused by the presence of bromate as a suspected carcinogen, attention had been addressed to the conditions under which bromate is formed. In this study, photoanodic bromine generation and bromate (BrO3-) formation were investigated using a TiO2 electrode in a photoelectrocatalytic (PEC) treatment process. The separation of anodic and cathodic reactions in the PEC system resulted in a pH decrease from 9.3 to 3.0 in the photoanode compartment and an increase to 11.0 in the cathode compartment. Under a photo-illumination intensity of 5.7 mW cm-2 UV, a biasing potential of +1.0 V vs SCE, a pH of 6.0 and at a NaBr concentration of 1.0 × 10-2 M, active bromine formation increased over time with 2.4 × 10-6 M min-6 rate and reached a steady-state concentration of 1.44 × 10-4 M in 60 min. Bromate formation was detected after a lag-period of 15 min and exhibited a continuous increasing trend with respect to irradiation time. No bromate formation was observed below pH 6.5 whereas an increasing bromate concentrations and pH up to pH = 8.5 were noted. © 2005 Elsevier Ltd. All rights reserved. | URI: | https://hdl.handle.net/11499/4671 https://doi.org/10.1016/j.chemosphere.2005.04.086 |
ISSN: | 0045-6535 |
Appears in Collections: | Mühendislik Fakültesi Koleksiyonu PubMed İndeksli Yayınlar Koleksiyonu / PubMed Indexed Publications Collection Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection |
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