Investigation of Photocatalytic Activity of Nano-Sized TiO2 with the Presence of Various Inorganic Anions
The effect of various anions on the photocatalytic activity of nano-sized TiO2 was investigated in a methyl orange solution. The photocatalytic activity of the TiO2 nanoparticles was significantly affected in the presence of SO2−
4, CO2−
3,
NO−
3 and Cl−. Among the tested ions, Cl− was most effective anion in changing the photocatalytic activity. Addition of Cl− (0.05 M) decreased the methyl orange photodegradation rate to only one quarter of that when
TiO2 was used alone. It was also demonstrated that the effects of these inions, on the rate of photocatalytic activity of the nanoparticles, were concentration dependent. There was a negative correlation between the concentrations of NO−
3 and Cl−
and the methyl orange degradation rate by TiO2. However, at low concentrations, CO2−
3 and SO2−
4 enhanced the photocatalytic activity; while at the higher concentrations, these two anions inhibited the photocatalytic activity
of TiO2
Keywords: INORGANIC ANION; METHYL ORANGE; NANO-SIZED TIO2; PHOTOCATALYTIC ACTIVITY
Document Type: Research Article
Publication date: 01 June 2009
- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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