Photocatalytic Degradation of Phenol Solution in the Presence of Au/TiO2 Catalyst under the Irradiation of UV and Visible Light
Date Issued
2011
Date
2011
Author(s)
Shen, Yun-Hsiang
Abstract
The purpose of this research is to apply Au/TiO2 for the photocatalytic degradation reaction of phenol, a commonly found organic compound in industrial wastewater, and to observe the concentration profiles as well as the selectivity of the intermediates. In addition, we want to investigate whether Localized Surface Plasmon Resonance (LSPR) effect can enhance the reaction rate.
This research is divided into three parts. First, we illuminated the phenol solution with 300 nm UV light only. The initial concentration of phenol solution is 250 ppm and 150 ppm, respectively. We found that the reaction rate constant of phenol was nearly independent of the initial concentration. The second part is to explore the temperature effect on the kinetics when using P25 and 2.0 wt% Au/P25 as the catalyst, individually. We observed that when the reaction temperature increased from 32℃ to 38℃, the reaction rate constant of phenol dropped. Even when we elevated the reaction temperature to 55℃, the reaction rate constant of phenol only slightly increased. We suppose that it is because the adsorption step rather than the surface reaction step is the rate-determining step.
The third part is to illuminate the phenol solution with 300 nm UV and 575 nm visible light at the same time. The reaction rate constant of phenol became a little larger when applying dual light sources. As for the mono-hydroxylated intermediates, although the increase in the reaction rate constant was not obvious, when compared with the data obtained by illuminating the solution with UV light only, we believe that LSPR must promote the overall reaction rate of the photocatalytic degradation reaction of phenol.
Subjects
Titanium dioxide
Phenol
Photocatalytic degradation reaction
Localized Surface Plasmon Resonance (LSPR)
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