Enhancement of adsorption and photocatalytic activity of TiO2 by using carbon nanotubes for the treatment of azo dye

Photocatalytic Removal of NOx over Visible Light Responsive Oxygen-Deficient TiO2

“…The photoluminescence (PL) emission spectra can be used to understand the fate of photogenerated electrons and holes in semiconductor particles since PL emission results from the recombination of free carriers. 46,47 PL emission spectra of the catalysts are shown in Figure 8 revealing that the peaks are nearly identical in shape and position for all of the catalysts. The PL intensity of TiO 2 -150, TiO 2 -200, and TiO 2 -300 was significantly reduced, indicating that the electron−hole recombination on the surface of these catalysts was largely inhibited to generating more photoelectrons and holes to participate in the photocatalytic reaction.…”

Optimization synthesis of carbon nanotubes-anatase TiO2 composite photocatalyst by response surface methodology for photocatalytic degradation of gaseous styrene

“…5a), which may be due to the disappearance of the well-defined exposed {0 0 1} crystal facets and the increase of amount of MWCNTs preventing TiO 2 from light absorption. On the other hand, the increase of the amount of MWCNTs can also enhance the adsorption and enrichment capacity of the composite photocatalyst to organics [29]. As known, the adsorption of pollutants onto the photocatalyst surface is the first step of photocatalytic reaction, and the higher the adsorption capacity was, the greater the photocatalytic reaction rate constant was [8].…”

Comparison of different phases of bismuth silicate nanofibers for photodegradation of organic dyes

“…The additional amount of dye in the solution acts as a filter for the incident light intensity to reach nanofibers surface under the same condition. Therefore, the rate of photocatalytic reaction decreases (Yu et al 2005).…”