Study of Indigo carmine as radical probe in photocatalysis
2009 (English)In: Journal of Photochemistry and Photobiology A: Chemistry, ISSN 1010-6030, Vol. 202, no 2-3, 86-91 p.Article in journal (Refereed) Published
The feasibility of using Indigo carmine (IC) as a probe of free radical production in photocatalysis was elucidated by comparative studies of its bleaching by gamma radiolysis and TiO2 photocatalysis. The gamma radiation result from pH 3 to 10 shows that both (OH)-O-center dot and HO2 center dot can bleach IC and that the bleaching yields of (OH)-O-center dot is pH independent at similar to 0.7 molecules per (OH)-O-center dot. The quantum yields (phi) of (OH)-O-center dot from Degussa p25 TiO2 photocatalysis from pH 3 to 10 was determined. It was found that phi was about 4% at pH 10 and dropped to below 1% at pH 3. This agrees well with the result of photocatalysis of Fricke dosimetry at pH 1. The effects of some common inorganic anions that may affect photocatalytic systems in technical applications (Cl-, SO42-, Br-, HPO42-, B4O72-, HCO3-/CO32-) was also investigated, showing that these ions does not inhibit the photocatalytic bleaching efficiency of IC.
Place, publisher, year, edition, pages
2009. Vol. 202, no 2-3, 86-91 p.
Indigo carmine, Photocatalysis, Gamma radiolysis, Hydroxyl radical
IdentifiersURN: urn:nbn:se:kth:diva-18268DOI: 10.1016/j.jphotochem.2008.11.008ISI: 000264408700002ScopusID: 2-s2.0-59649105505OAI: oai:DiVA.org:kth-18268DiVA: diva2:336314
QC 201005252010-08-052010-08-052011-01-12Bibliographically approved