کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9681217 1455514 2005 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of pH, charge separation and oxygen concentration in photoelectrocatalytic systems: active chlorine production and chlorate formation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Effect of pH, charge separation and oxygen concentration in photoelectrocatalytic systems: active chlorine production and chlorate formation
چکیده انگلیسی
In this study, photoanodic chlorine generation and chlorate formation were investigated using a nanoporous TiO2 photo-electrode under an illumination intensity of 7.4 mW/cm2 UV and biased at +1.0 V vs. SCE. Chlorine formation increased over time finally reaching a steady-state concentration of 42 mg/l in 45 min. On the other hand, chlorate formation was observed after only 5 min irradiation and increased over time. The effect of pH, oxygen concentration and charge separation on chlorine generation and chlorate formation was also investigated. Chlorine production was practically constant over a pH range of 4.0-8.0, but decreased slightly at higher pH values. Chlorate production could be detected at pH values ≥7.0. A significant effect of oxygen concentration on chlorate formation was observed. Chlorate was significantly reduced under nitrogen gas. Chlorine production in the separated photoanode compartment was about 10 fold higher than that in a combined photoanode-cathode system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 176, Issues 1–3, 10 June 2005, Pages 219-227
نویسندگان
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