Muhammad Saeed and Sheeba Khalis
Government College University Faisalabad, Pakistan
Posters & Accepted Abstracts: Trends in Green chem
Aqueous pollution due to textile industry is an important issue. Photo catalysis using metal oxides as catalysts is one of the methods used for eradication of dyes from textile industrial effluents. In this study, the synthesis, characterization and evaluation of photo catalytic activity of Ag-TiO2 is reported. TiO2 catalysts with 2, 4, 6 and 8% loading of Ag were prepared by green methods using Azadirachta indica leaves extract as reducing agent and titanium dioxide and silver nitrate as precursor materials. The 6% Ag-TiO2 exhibited the best catalytic activity for degradation of dyes. Prepared catalyst was characterized by advanced techniques. Catalytic degradation of methylene blue and rhodamine B were carried out in pyrex glass batch reactor. Deposition of Ag greatly enhanced the catalytic efficiency of TiO2 towards degradation of dyes. Irradiation of catalyst excites electrons from conduction band of catalyst to valence band yielding an electron-hole pair. These photo excited electrons and positive hole undergo secondary reaction and produce OH radicals. These active radicals take part in degradation of dyes. More than 90% dyes were degraded in 120 minutes. It was found that there was no loss in catalytic efficiency of prepared Ag-TiO2 after recycling it for two times. Photo catalytic degradation of methylene blue and rhodamine B followed Eley-Rideal mechanism which states that dye react in fluid phase with adsorbed oxygen.
E-mail:
msaeed@gcuf.edu.pk
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