کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4416844 1307802 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Bromate formation on the non-porous TiO2 photoanode in the photoelectrocatalytic system
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Bromate formation on the non-porous TiO2 photoanode in the photoelectrocatalytic system
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 62, Issue 5, February 2006, Pages 715–721
نویسندگان
, , , ,