Synthesis, characterization and photocatalytic activity of nanotitania loaded W-MCM-41
Shankar, H; Rajasudha, G; Karthikeyan, A; Narayanan, V; Stephen, A
| HERO ID | 2806296 |
|---|---|
| In Press | No |
| Year | 2008 |
| Title | Synthesis, characterization and photocatalytic activity of nanotitania loaded W-MCM-41 |
| Authors | Shankar, H; Rajasudha, G; Karthikeyan, A; Narayanan, V; Stephen, A |
| Journal | Nanotechnology |
| Volume | 19 |
| Issue | 31 |
| Page Numbers | 315711 |
| Abstract | Nanocrystalline titanium oxide (TiO(2)) is a promising material as a photocatalyst for photodecomposition of hazardous organic pollutants under illumination, because it is cheap, safe, environmentally benign, and chemically stable. However, the control of particle size and monodispersity of TiO(2) is a challenging task. The use of MCM-41, an inorganic template of uniform pore size (2-10 nm), can overcome this difficulty and produce stable nanoparticles of uniform size and shape. In an attempt to extend light absorption of the TiO(2)-based photocatalyst towards the visible light range and eliminate the rapid recombination of excited electrons/holes during photoreaction, a new photocatalyst (25%TiO(2)-loaded W-MCM-41) powder was prepared. W-MCM-41, with different ratios of Si to W (Si/W = 25, 50, 75), was synthesized by a hydrothermal method and loaded with 25 wt% TiO(2) utilizing a sol-gel method. In order to compare the photocatalytic activity of our sample, titania-loaded plain MCM-41 was also prepared. These materials were characterized by various physiochemical techniques such as UV-visible absorption spectroscopy, x-ray diffraction, nitrogen adsorption-desorption isotherm measurement, Fourier transform infrared (FT-IR) spectroscopy, and transmission electron microscopy. The photocatalytic activity of the prepared samples was evaluated using methyl orange as a model organic compound. It was found that the photodegradation ability of 25% TiO(2)-loaded W-MCM-41 was highly related to the amount of W atoms present in the sample; the optimum atomic ratio of Si to W was 25. It has been confirmed that the recombination rate of electrons/holes in 25%TiO(2)/W-MCM-41 declined due to the existence of W atoms in the sample. |
| Doi | 10.1088/0957-4484/19/31/315711 |
| Pmid | 21828803 |
| Wosid | WOS:000257166800026 |
| Is Certified Translation | No |
| Dupe Override | No |
| Is Public | Yes |
| Language Text | English |