Synthesis and characterization of TiO2 and TiO 2/Ag for use in photodegradation of methylviologen, with kinetic study by laser flash photolysis
2015
This paper reports the synthesis, characterization, and application of TiO₂and TiO₂/Ag nanoparticles for use in photocatalysis, employing the herbicide methylviologen (MV) as a substrate for photocatalytic activity testing. At suitable metal to oxide ratios, increases in silver surface coating on TiO₂enhanced the efficiency of heterogeneous photocatalysis by increasing the electron transfer constant. The sol–gel method was used for TiO₂synthesis. P25 TiO₂was the control material. Both oxides were subjected to the same silver incorporation process. The materials were characterized by conventional spectroscopy, SEM micrography, X-ray diffraction, calculation of surface area per mass of catalyst, and thermogravimetry. Also, electron transfers between TiO₂or TiO₂/Ag and MV in the absence and presence of sodium formate were investigated using laser flash photolysis. Oxides synthesized with 2.0 % silver exhibited superior photocatalytic activity for MV degradation.
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