P hotodegradation of Acid Ora nge ۷ over AgBr/TiO۲ Nanoc omposite u nder UV Light Illu mination

Dye co ntaining wa ste water generated from textile industries represents an increasing environm ental pollution owing to its non-biodegradability, toxicity , and poten tial carcinogenic nature. A zo dyes, wh ich are widely used in textile indus try designed to resist degradation [۱]. In the past two decades, much atte ntion has b een focuse d on photocatalytic degradation of these pollutants mediated by TiO۲ particles under UV light illumination [۲]. These o rganic poll utants are oxidized by photogenerated positive holes (h+) or by reactive o xygen species (OH•, HOO•-, O۲•-) for med on the T iO۲ surface under UV light irradiation [۱]. The high band gap, low qua ntum efficienc y, and high rate of reco mbination of photo ge nerated positive holes (h+) and elec trons (e-) have limited the use of TiO۲ as photocatalyst. In rec ent years, some researches were do ne in order to promote the photocatalytic property of TiO۲. The aim of this work was to synth esize TiO۲, Ag/TiO۲ nano particles, an d AgBr/TiO۲ nanocomposite by the sol-gel met hod to investigate the degr adation of Acid Orange ۷ (AO۷). The effect of calcination tempereture, initial dye concentr ation, TiO۲ loading, pH, and the add ing of H۲O۲ on the rate of photode gradation of AO۷ was also examined.

کلیدواژه ها:

Photodegradation ، Ag/TiO۲ nanoparticles ، AgBr/ TiO۲ nanocomposite ، Acid Orange ۷