Kinetics of heterogeneous photocatalytic degradation of rhodamine B by TiO₂-coated activated carbon: Roles of TiO₂ content and light intensity
2011
Zhang, Wenlong | Li, Yi | Wang, Chao | Wang, Peifang
The photocatalytic degradation kinetics of rhodamine B (RhB) by TiO₂-coated activated carbon (TiO₂/AC) catalyst under different reaction conditions (light intensity, TiO₂ content in TiO₂/AC and initial content of contamination) was elucidated by modeling. The kinetics of Rhb photodegradation was found to follow the first-order rate law and could be described in terms of a modified Langmuir–Hinshelwood model. The value of the apparent rate constant kₐₚₚ was proposed on the basis of intrinsic element reactions, such as light intensity, reaction intermediates and the photo-induced hole (h±) formation. The apparent rate constant kₐₚₚ first increased with increasing TiO₂ content of the TiO₂/AC catalyst and then decreased. The optimal value of the TiO₂ content could be obtained through the model; the apparent rate constant was linear with respect to the square of the intensity. The validity of the model was also proved with other researchers’ results.
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