Abstract
Photocatalytic oxidation of organic contaminants is a hot topic in environmental research. However, an effective purification process needs an effective photoreactor. Typical light sources such as mercury and halogen lamps are replaced with more energy efficient Light Emitting Diodes. In the current work, a miniature photoreactor with low catalyst consumption was presented. The work of the micro-photoreactor is investigated using anatase and P25 industrial titania as model catalysts. The key element of the microreactor is replaceable UV-LED. The used 365 nm emission wavelength is optimal for the model pollutant Rhodamine B dye. The micro-photoreactor is able to mineralize the Rhodamine B dye almost completely.
Highlights
In the last years, much attention is paid to “green” methods of wastewater remediation [1,2,3,4]
Photocatalytic oxidation of organic contaminants is a hot topic in environmental research
The used 365 nm emission wavelength is optimal for the model pollutant Rhodamine B dye
Summary
Much attention is paid to “green” methods of wastewater remediation [1,2,3,4]. Photocatalytic oxidation leads to complete degradation of organic pollutants. Sunlight-activated photocatalyst leads to splitting of water molecules and formation of hydroxyl radicals. The differences in crystalline structure cause different photocatalytic activities of the three titania polymorphs. Superoxide and hydroxyl radicals are highly reactive to degrade organic pollutants. LED light sources should be optimized in terms of both power and emission spectrum. With degradation of RhB dye, energy consumption was several times higher than that with using modernized LED reactor. These data suggest that mercury lamps should be replaced by LEDs. Bukman et al [34] proposed a new approach to evaluation of photoreaction performance. The mini-reactor is environmentally friendly due to small amount of catalyst and reagents used
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