Good day to all, I have no experience with light emitting diodes.
I am building a glass mini flume to demonstrate the photo degradation of Methylene Blue in water running over self cleaning concrete. Two demonstration types will be performed, UV based and Visible Light based degradation, which will be timed and video recorded. Video results will be time lapsed into shorter clips for small size download via the internet. This mini flume unit will be used in our stand at an upcoming mining and concrete expo to demonstrate the effectiveness of the nano composite.
1. Degradation of MB in water via UVLED using a concrete with photocatalytic anatase TiO2 5-10nm as an additive at 0.5%, 1%, 1.5% and 2%.
2. Degradation of MB in water via LED using a concrete with photocatalytic anatase N doped TiO2 10-15nm as an additive at 0.5%, 1%, 1.5% and 2%.
I have attached the drawing of the mini flume, ignore the light bulbs in the lid. I would like to attach a series of LEDs to the glass lid. The series of LEDs will be divided equally between UVLED and LED each LED type being on a different switch so that the same unit can be used for both trials.
I would like to use the setup to test various aqueous solutions containing different pollutants showing the effectiveness of photodegradation on waterborne pollutants which will be presented to our Water Research Commision. So the LEDs need to be powerful enough to penetrate quite murky test mediums.
The flume will be constructed from heat resistant glass, and attaching the LEDs via heat/waterproof/chemical resistant epoxy along with wiring coated and attached via the same. LEDs will be surface mount type.
Can any of you please suggest the best LEDs to be used. eg. Forward Voltage, Forward Current, Luminous Flux, Luminous Intensity, Radiant Flux, Colour Temperature?
Thank you and my respect to the community.
There are numerous manufactures of LED and you can find the correct (I don't know what is correct) light source. In addition you have de design the "correct" holder of light sources, e.g. to focus light on the target.
Was thinking of using LEDs with dome shaped lense that have a view angle of 120° that are mounted level with the surface of the lid. So the light has a larger emitting angle to make sure the concrete sample is sufficiently lit. I have attached a drawing outlining my thoughts on the layout of the LEDs.
I would not use any lenses. Just cover your light compartments (if it's light transparent) by aluminum foil.
Degradation (decolorization and mineralization) of MB in water using anatase TiO2, easy to achieve using natural solar light particularly when anatase N doped TiO2 applied. UVLED is effective but not feasible and practical for large scale due to energy cost.
- Badges
- Science topic