Abstract
The photocatalytic activity of silver deposited Degussa P25 titanium dioxide (Ag-DP25) in the photodegradation of methylene blue (MB) was investigated. The as-prepared materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (DRS), infrared spectra and surface photovoltage spectroscopy (SPS) techniques. The obtained results show that the silver dopant could effectively inhibit the recombination of the photoinduced electron and holes, improving the absorption capability for visible light of photocatalyst and leading to increased surface OH group density. The degradation experiment reveals that the catalytic property of Ag-DP25 in the degradation of MB dye is more efficient than that of commercially available Degussa P25 TiO2 (DP25) samples under visible-light irradiation. Besides, degradation kinetics of MB dye can, be well described by Langmuir-Hinshelwood equation and shows pseudo-first order law.
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