Analysis of Photocatalytic Reactions Using a TiO2 Immobilized Microreactor
News Apr 15, 2011
We have developed an analysis system for photocatalytic reactions, which utilizes a TiO2 immobilized micro-capillary and a detection technique for dye concentration at arbitrary positions. In this study, we investigated the reaction processes for the photocatalytic decomposition of rhodamine 6G. This system allows the distinction of direct and secondary photocatalytic reactions under the same experimental conditions. The direct reaction occurs between adsorbed species and photoexcited electrons or holes, while the secondary reaction is induced by radicals, such as •OH, O(2)(+)•, generated in water or ethanol. The entire reaction was studied by monitoring the dye concentration in the UV irradiated area, while only the secondary reaction was monitored outside the UV irradiated area.
The article is published online in the journal Analytical Sciences and is free to access.
Catalysis is common in many industries such as pharmaceutical, specialty chemicals, agriculture, polymer and over 90% of chemicals are made from catalytic processes. Researchers have reported an asymmetric reaction that uses a cationic (positively charged) catalyst to convert racemic (equal mixture of two enantiomers) substrates to asymmetric product via an intriguing reaction route,READ MORE