Photocatalytic Degradation of Methylene Blue Dye Using Ultraviolet Light Emitting Diodes

Abstract

This study was focused on the application of ultraviolet light emitting diodes (UV-LED) as an alternate source for the photocatalytic degradation of methylene blue (MB), which was used as a model compound. A simple reactor arrangement was made to carry out the photocatalytic degradation of methylene blue dye. The photocatalytic activity of P-25 Degussa TiO 2 was evaluated using UV-LED reactor. The decomposition of MB dye in aqueous solution by TiO 2 photocatalytic process with the UV-LED was found to be technically feasible. The effects of various parameters such as catalyst loading, initial dye concentration, pH, and addition of H 2 O 2 on decolorization and degradation have been investigated to find the optimum conditions. The complete mineralization of MB dye (3.12 × 10 -5 M) was confirmed by chemical oxygen demand analysis. Results demonstrated that the UV-LED/TiO 2 process can effectively degrade methylene blue dye with optimum conditions.

Green synthesis of mesoporous anatase TiO2nanoparticles and their photocatalytic activities

“…The reduction in the degradation efficiency aer 10 catalytic cycles, can be explained by the material loss during the recovering procedure because of the difficulty to avoid any loss of catalyst materials during the washing and ltration process. [32][33][34][35] Aer ten cycles of reusability test, TiO 2 NPs were analysed using XRD and FESEM to determine its phase, porosity and morphology stability. Fig.…”

Mixed Phase Anatase/rutile Titanium Dioxide Nanotubes for Enhanced Photocatalytic Degradation of Methylene-blue

“…We are with the opinion that this effect is resulting in the changing relation of the continuous delivery of oxidation radicals from the irradiated nanotubes with the continuously lowered concentration of oxidizable methylene-blue molecules. In comparison of other work using TiO 2 /methylene-blue degradation systems based on nanoparticles [1,34] minimum of 50% shorter degradation time, using a lower irradiation power with a consideration on the used dye concentration.…”

“…Yao et al observed that the photodegradation efficiency decreases in the order of pH 2 > pH 9 > pH 7 and got best results for photodecradation at pH 2 [34]. Based on literature reports, best results for photocatalytic degradation of methylene-blue have been shown with dye concentrations of about 3.12 × 10 −5 mol/l in reference to a photocatalyst concentration of around 1 g/l [1]. Due to the low weight of the TNTs and by keeping reference to literature results vis-a-vis the achieved results of this report -a dye concentration of 1.3 × 10 −5 mol/l and five polycarbonate templates containing the TNTs were used for each photocatalytic dye degradation sample.…”

“…Semiconductive materials with suitable band gap and flat band potentials are used as photocatalysts. Several semiconductors such as TiO 2 , ZnO or Fe 2 O 3 are employed in industrial applications [1]. In case of photocatalytic nanomaterials, anatase titanium dioxide is the most widely used photocatalyst, pursuant to its pivotal role in photochemical solar cells with high conversion efficiency, due to its large band gap from 3.2 eV, corresponding to 387 nm [2][3][4][5][6][7].…”

Decolorization of Organic Compounds by Controlled Microalgal Culture

“…Among these species, hydroxyl radicals (·OH) have been reported to be a key to the decomposition of organic compounds due to their high reactivity [1][2][3][4].…”