Abstract
Abstract Aqueous pollution due to textile industry is an important issue. Photocatalysis 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 with titanium dioxide and silver nitrate as precursor materials. Prepared catalyst was characterized by advanced techniques and was used as catalyst for degradation of Methylene blue and Rhodamine B dyes. 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. This electron-hole pair undergoes secondary reactions and produce OH∙ radicals. These active radicals take part in degradation of dyes. More than 90% dyes were degraded in 120 min. Photo catalytic degradation of Methylene blue and Rhodamine B followed Eley-Rideal mechanism which states that dye react in fluid phase with adsorbed oxygen.
Highlights
Reaction kineticsTiO2 (Merck), AgNO3 (Alfa Aesar), Methylene blue (Merck), Rhodamine B (commercial grade), Azadirachta indica leaves (Botanical garden, University of Agriculture Faisalabad, Pakistan) and distilled water were used in this study
The photocatalytic activity of Ag-TiO2 was demonstrated with two different solutions of Methylene blue and Rhodamine B in a batch reactor
Ag-TiO2 was successfully fabricated by environmentally friendly and low cost green method using Azadirachta indica leaves extract as reducing agent and titanium dioxide and silver nitrate as precursor materials
Summary
TiO2 (Merck), AgNO3 (Alfa Aesar), Methylene blue (Merck), Rhodamine B (commercial grade), Azadirachta indica leaves (Botanical garden, University of Agriculture Faisalabad, Pakistan) and distilled water were used in this study. The kinetics of present degradation study can be described by pseudo first order kinetics model in terms of Eley– Rideal (E-R) mechanism. This mechanism is described by Eq 2 which transforms to Eq 3 and Eq 4 by considering constant pressure of oxygen and integration respectively
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