Photocatalytic degradation of methyl orange with W-doped TiO2 synthesized by a hydrothermal method

Abstract

a b s t r a c tNanosized W-doped TiO 2 photocatalysts were synthesized by a simple hydrothermal method, and characterized by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), transmission electron microscopy (TEM) and BET surface area analyzer. The photocatalytic activity of undoped TiO 2 and Wdoped TiO 2 photocatalysts was evaluated by the photocatalytic oxidation degradation of methyl orange in aqueous solution. The results show that the photocatalytic activity of the W-doped TiO 2 photocatalyst is much higher than that of undoped TiO 2 , and the optimum percentage of W doped is 2.0 mol%. The enhanced photocatalytic activity of the doped photocatalyst may be attributed to the increase in the charge separation efficiency and the presence of surface acidity.

Investigation of Photocatalytic Degradation of Methyl Orange by Using Nano-Sized ZnO Catalysts

“…Therefore, when the MO solution pH value is below the PZC, the MO anions should be readily adsorbed on the surfaces of nano-sized ZnO particles. As is described by H. Tian et al [1], the photocatalytic degradation efficiency of MO solutions with nano-sized TiO 2 catalysts changes with the temperature variation of the MO solutions. Hence, the effect of MO solution temperature on the degradation efficiency of MO catalyzed by ZnO nano-particles was also discussed in the range from 20 to 70˚C at 10˚C intervals in this study.…”

“…Semiconductor photocatalysts such as TiO 2 and ZnO nano-particles have attracted much attention in recent years due to their various applications to the photocatalytic degradation of organic pollutants in water and air and dye sensitized photovoltaic solar cell [1][2][3]. Among these semiconductor photocatalysts, TiO 2 is the most commonly used owing to its stable, harmless and inexpensive properties.…”

Degradation of malachite green on Pd/WO3 photocatalysts under simulated solar light

“…The photocatalytic decomposition of various organic compounds in industrial wastewater has been extensively studied, since the pollutants can be oxidized quickly and non-selectively [1][2][3][4][5][6][7][8]. Among various semiconductors, titanium oxide (TiO 2 ) has been employed as a typical photocatalyst for both fundamental research and practical applications owing to its excellent stability and high photoactivity under ultraviolet (UV) light.…”

Introduction of W-doped ZnO nanocomposite as a new and efficient nanocatalyst for the synthesis of biscoumarins in water

“…One of the most important applicabilities of nano-ZnO is based on its photocatalytic activity which occurs under ultraviolet light excitation [42][43][44][45][46]. In 2008, Ma et al [47] reported that the catalytic activity of TiO 2 in photocatalytic degradation of methyl orange can be highly improved by doping with tungsten. They attributed this result to the help of the doped W in trapping of photogenerated electrons and the enhancement of the surface acidity of TiO 2 .…”