Microwaves in Photochemistry

Microwave photocatalysis II: novel continuous‐flow microwave photocatalytic experimental set‐up with titania‐coated mercury electrodeless discharge lamps

“…The temperature of the MCAA aqueous medium affects the EDL envelope (Pyrex) temperature and therefore the plasma lighting properties. 5 The relative intensities of the individual emission peaks in Hg-EDL were found to be very dependent on temperature; 7 the 254 nm line was suppressed with increasing temperature, however, the 366 nm line (the titania-coated Hg-EDL on Pyrex) was enhanced. This phenomenon was disclosed in a previous report 7 and Fig.…”

“…1,2 Some research groups are investigating the enhancement of photodegradation. 3,4 Recent articles and reviews reported the lab-scale preparation of electrodeless discharge lamps (EDLs), 5,6 their spectral measurements, 7 utilization in photochemistry 8 -10 and also in microwave-assisted photocatalytic decomposition of monochloroacetic acid. 11 While some of the physico-chemical principles of photocatalysis are relatively well understood, 12 the reactor engineering of photocatalytic units still requires consideration.…”

Microwave photochemistry V: Low‐pressure batch and continuous‐flow microwave photoreactors with quartz mercury electrodeless discharge lamps. Photohydrolysis of mono‐chloroacetic acid

“…The objective of microwave photochemistry is frequently, but not necessarily, connected with the electrodeless discharge lamp (EDL) which generates UV/Vis radiation when placed in the microwave field. 1,2 In recent papers and reviews on microwave photochemistry 1 we have described the preparation of EDLs, 3 spectral characteristics of the lamps, 4 and their application in organic photochemical synthesis 2,5,6 and in the microwave photocatalytic decomposition of mono-chloroacetic acid over nanoporous titania thin film. 7 Photolysis in microwave batch reactors has previously been described.…”

“…1 Such equipment allows for simultaneous irradiation of the reaction mixture with both microwave and UV/Vis radiation. The objective of microwave photochemistry is frequently, but not necessarily, connected with the electrodeless discharge lamp (EDL) which generates UV/Vis radiation when placed in the microwave field.…”

“…7 Photolysis in microwave batch reactors has previously been described. 1 In these arrangements the EDL was placed in a reaction vessel located in a microwave oven and the reaction mixture was irradiated with UV/Vis radiation and microwaves. The intense infrared output from the EDL triggers immediate boiling of solvents.…”