Preparation and Characterization of Ag doping TiO2 nanomaterial for the photocatalytic degradation of Malachite green as a model cationic dye

Document Type : Research Paper


Department of Chemistry, College of Sciences for Girls, University of Babylon, Hilla, Iraq


Titanium dioxide (TiO2) NPs were prepared using the modified hydrothermal process. Silver(Ag) doped Titanium dioxide (TiO2), were prepared photo reduction method, characterization Ag /TiO2 nanoparticles by x- ray diffraction(XRD), thermos gravimetric analysis (TGA), and UV-Vis Diffuse Reflectance Measurements(BG), FESEM , and TEM .Malachite green (MB) dye was used as a model pollutant to study the photocatalytic activity of Ag /TiO2 nanoparticles under UV light irradiation. The influence of the amount of Ag /TiO2 nanoparticles catalyst as well as of initial concentration of MG dye was investigated. When the increase in catalyst amount up to 0.3 g/L increase the number of active site, but beyond 0.3g/L there is little increase in % degradation. thus best catalyst 0.3g/L used to removal MG dye. Photo catalytic activity rise was observed for Ag /TiO2 nanoparticles which is about 95.67%. photocatalytic degradation efficiency (PDE%) increases as the dye concentration decreases from (98.67% - 40.76%), and the photo degradation capacity rise when light intensity increase. It probably deduced, the rise of light intensity caused to excited particles of Ag /TiO2 nanoparticles. The photo catalytic degradation efficiency was 83.9% ,78.8 %, and 68.5% during 3 cycle compared to standard solution(fresh) was 90.9%. the best reactive oxygen species (ROS) when used hydrogen peroxide(H2O2) comparative with methanol, thus the hydrogen peroxide important in enhancing the performance of photo catalytic degradation.