UNED -Light can help us to clean up out water. Photocatalytic degradation of Methylene Blue in water
Places availables
Organizer
Time
Viernes 26 Septiembre 12:00-13:00
Venue
UNED Las Rozas, Av. de Esparta s/n, Las Rozas de Madrid
Collaborators
The experimental activity will consist of carrying out the photocatalytic degradation of methylene blue dye using an LED reactor that operates under visible illumination, using semiconductor oxides like ZnO or TiO₂ as photocatalysts. The objective is to simulate the removal of organic pollutants present in wastewater through an advanced oxidation process.
To do this, an aqueous solution of methylene blue with a known concentration, for example, 20 μM, is initially prepared, and a measured amount of the photocatalyst (0.5 g/L of ZnO or TiO₂) is added. The suspension is stirred for 15 to 30 minutes in the dark to allow for the adsorption equilibrium of the dye onto the photocatalyst's surface. Then, the mixture is introduced into the photocatalytic reactor, which has a visible light source (LED in the 400 to 700 nm range) and a continuous stirring system.
In a second stage of the experiment, an ozonizer can be incorporated. This ozonizer generates ozone from air or oxygen, which is bubbled into the reactor at a controlled flow rate (for example, 0.5–1 L/min), acting as an additional oxidant to enhance the dye's degradation.
To do this, an aqueous solution of methylene blue with a known concentration, for example, 20 μM, is initially prepared, and a measured amount of the photocatalyst (0.5 g/L of ZnO or TiO₂) is added. The suspension is stirred for 15 to 30 minutes in the dark to allow for the adsorption equilibrium of the dye onto the photocatalyst's surface. Then, the mixture is introduced into the photocatalytic reactor, which has a visible light source (LED in the 400 to 700 nm range) and a continuous stirring system.
In a second stage of the experiment, an ozonizer can be incorporated. This ozonizer generates ozone from air or oxygen, which is bubbled into the reactor at a controlled flow rate (for example, 0.5–1 L/min), acting as an additional oxidant to enhance the dye's degradation.
