We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Photocatalytic Degradation of Diazo Dye over Suspended and Immobilized TiO 2 Catalyst in Swirl Flow Reactor: Kinetic Modeling.
- Authors
Jadaa, Waleed; Prakash, Anand; Ray, Ajay K.
- Abstract
The degradation kinetics of Direct Blue 15 (DB15), a diazo dye, were studied over a suspended and immobilized TiO2 catalyst. For all experiments, the kinetics experiments were performed in a swirl flow photoreactor under the influence of UV light. The effect of different parameters: dye concentration, catalyst loading, and light intensity, on the DB15 kinetics was investigated. The kinetic rates were assessed using apparent (k a) approach, a single value of reaction rate (k r) and adsorption constant (K) , and approach of k r as of variable. The DB15 mineralization was discussed as well. Using a dip-coating device, the P25 catalyst was deposited on a Pyrex glass. The thin film surface characterization was examined. The coated catalyst was evaluated by checking the effect of two variables: initial dye concentration and light intensity on the DB15 kinetics. In terms of the k a approach, the results demonstrated that DB15 degradation is described by the pseudo first-order kinetics model. The Langmuir-Hinshelwood (L-H) model was fitted well with the experimental data for the number of process variables. L-H constant k r was determined as a function of three parameters: initial dye concentration, catalyst loading, and light intensity. The k a values were evaluated and compared with experimental results. In terms of three variables, k a can be expressed as k a = 0.15 [ C ] o − 0.69 [ W ] 0.73 I 0.91 1 + 0.17 [ C ] o while the empirical model results in the following expression, k a = 0.77 [ C ] o − 1.65 [ W ] 0.73 I o 0.89 . It was observed that 83.64% mineralization was achieved after a period of 16 hrs. In terms of immobilized catalyst, the DB15 degradation kinetics was described by a pseudo first-order model for different dye concentrations. Meanwhile, a power-law model described the impact of light intensity on dye kinetics. In addition, the coated catalyst was successfully reusable with high efficiency for up to four cycles.
- Subjects
TITANIUM dioxide; PHOTODEGRADATION; SWIRLING flow; SURFACE analysis; CATALYSTS; PHOTOVOLTAIC power systems
- Publication
Processes, 2021, Vol 9, Issue 10, p1741
- ISSN
2227-9717
- Publication type
Article
- DOI
10.3390/pr9101741