Kinetics of Photocatalytic Degradation of Methylene Blue over TiO2 Particles in Aqueous Suspensions
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The kinetics of photodegradation of methylene blue over UV light illuminated titania particles in aqueous suspensions has been studied with different initial methylene blue concentrations and TiO2 particle sizes. The degradation rate increases with the decrease of initial concentration and particle size. A quasi-experienced model for photodegradation rate is derived based mainly on the coinstantaneous effects of different initial concentrations and particle sizes. The mathematical relationships of model parameters with initial concentration and particle size are given. The model results of the photodegradation rate of methylene blue are coincident with the experimental data.Keywords:
Photodegradation
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Methylene blue
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Photodegradation
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We investigated the degradation of methylene blue (MB) as an organic dye pollutant upon photocatalytic oxidation of TiO2 nanoparticles under UV-LED (395 nm) light irradiation. Effect of different parameters, including initial concentration of dye and catalyst dosage on the degradation rate of the dye were evaluated. We found that the photonic efficiency of the photocatalytic degradation rate of the dye was determined by the ratio between the initial concentration of the dye and the number of TiO2 nanoparticles in the colloidal solution. The optimum photocatalytic degradation rate was achieved when the TiO2 nanoparticles in the solution are well covered by dye molecules, providing an interpretation that MB–TiO2 molecular interactions play the key role in the photoinduced oxidation and reduction, leading to the photocatalytic degradation. We also demonstrated that the energy activation of the photocatalytic degradation is related to diffusion-controlled reaction, indicating that the photocatalytic degradation of the dyes is diffusion-controlled reaction of free hydroxyl radicals.
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Kinetics of Photocatalytic Degradation of Methylene Blue over TiO_2 Particles in Aqueous Suspensions
The kinetics of photodegradation of methylene blue over UV light illuminated titania particles in aqueous suspensions has been studied with different initial methylene blue concentrations and TiO2 particle sizes. The degradation rate increases with the decrease of initial concentration and particle size. A quasi-experienced model for photodegradation rate is derived based mainly on the coinstantaneous effects of different initial concentrations and particle sizes. The mathematical relationships of model parameters with initial concentration and particle size are given. The model results of the photodegradation rate of methylene blue are coincident with the experimental data.
Photodegradation
Methylene blue
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Methylene blue
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The photo catalytic degradation of methylene blue has been investigated in presence of bismuth oxide. The rate of photocatalytic degradation of dye was observed spectrophotometrically. The effect of variation of different parameters like pH, concentration of dye, amount of semiconductor and light intensity on the rate of photobleaching was also observed. A tentative mechanism for the photocatalytic degradation of methylene blue has also been proposed. The photocatalytic degradation of methylene blue has been investigated in presence of semiconductor bismuth oxide. The rate of photocatalytic degradation of dye was observed spectrophotometrically. The effect of variation of different parameters like pH, concentration of dye, amount of semiconductor and light intensity on the rate of photobleaching was also observed. A tentative mechanism for the photocatalytic degradation of methylene blue has also been proposed.
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In this research, degradation of methylene blue as a dye pollutant was investigated in the presence of TiO2 nanopowders using photolysis and sonolysis systems separately and simultaneously. Effect of different parameters such as catalyst dosage, initial concentration of dye, UV power, pH and type of catalyst on the removal efficiency was ascertained. The results showed that basic pH is proper for the photocatalytic removal of the dye. Furthermore higher UV power and lower initial concentration of dye leads to higher removal percent. Moreover TiO2 showed more photocatalytic activity than ZnO in the nanopowder form. The experimental kinetic data followed the pseudo-first order model in both photocatlytic and sonophotocatalytic processes but the rate constant of sonophotocatalysis is higher than it at photocatalysis process. Finally the reaction order of the rate law respect to nanocatalyst dosage in photocatalysis process is obtained 1.45. High activation energy of this process shows its high sensitivity to temperature.
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Photodegradation
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Kinetic study of methylene blue photocatalytic decolorization using zinc oxide was carried out under UV-LED lamp irradiation. Zinc oxide was prepared by precipitation method. Zinc oxide was characterized by XRD, FESEM, and N2 adsorption-desorption. Characterization results show that zinc oxide has a hexagonal crystal face, particle size between 0.125-0.3 µm, specific surface area (SBET), micropore volume, and mesopore volume are 60.20 m2/g, 0.541 cm3/g, and 0.02 cm3/g, respectively. The variations of pH and concentration of methylene blue solution were observed. The results show that the alkaline conditions had the highest methylene blue photocatalytic decolorization rate. At initial low concentration, the methylene blue photocatalytic decolorization is very high and decrease when the initial concentration of methylene blue increase. Photocatalytic decolorization reaction kinetics follow the first-order kinetic. The Langmuir-Hinshelwood kinetic analysis results show that photocatalytic reaction constant and Langmuir-Hinshelwood constant value are 2.2621 L.mg−1.min−1 and 0.0144 L.mg-1, respectively.
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Methylene blue
Titanium Dioxide
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