AgBr/TiO2 가시광 촉매를 이용한 CI Direct Blue 15가 함유된 염료폐수의 처리

Abstract

Today, azo dyes were commonly used in textile industry processes. The azo dyes form the largest polluting group among the synthetic pigments. For these reasons, the wastewater containing azo dyes should be treated in appropriate methods. A microbial treatment, electrolysis, and photocatalytic oxidation were generally used for treatment for wastewater containing azo dyes. A photocatalytic oxidation, an advanced oxidation process, was safe, and simple to be operated and is considered to be economical. Commonly used TiO2 for photocatalysts has high photoactivity, is cheap, and photochemically and biologically stable substance. However, TiO2 has photoactivity only under ultraviolet light. So, there are limits for the photocatalysts to be applied under visible light. Thus, in this study, the visible light responsive AgBr/TiO2 materials were successfully fabricated using the sintering method and used as photocatalysts in photocatalytic degradation of CI Direct Blue 15. The prepared samples were characterized by X-ray diffraction and UV-vis diffuse reflectance spectroscopy. The absorption spectrum extends to the visible light range. As expected, the experiments of photocatalytic degradation of CI Direct Blue 15 show that AgBr/TiO2 exhibits much higher photocatalytic activity compared to pure TiO2 sample under visible light irradiation.