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Barwniki inspirowane naturą jako sensybilizatory dla fotokatalizatora ditlenku tytanu

Gusiak N. B., Kobasa I. M., Kurek S. S.

Chemik

2013

Vol. 67, nr 12

1191-1198

Przebadano trzy barwniki polimetinowe z grupami indolinowymi na końcu. Na podstawie danych elektrochemicznych i spektroskopowych wykazano, że energia ich LUMO jest wyższa od krawędzi pasma przewodnictwa anatazy (TiO2), a zatem mogą one działać jako sensybilizatory. Wyniki testów fotokatalitycznych wskazały, że najbardziej aktywny jest barwnik bez podstawników w łańcuchu polimetinowym.

Three polymethine dyes with indoline end groups were studied. Based on electrochemical and spectroscopic data it was shown that their LUMO energy is higher in energy than the conductance band edge of anatase TiO2), and hence they may act as sensitisers. Photocatalytic test results showed that the most active is the dye without any substituents in the polymethine chain.

Modification of TiO2 with W(VI) Ions: Photocatalytic Activity and Some Other Properties of Materials

Kobasa I. M., Wlodarczyk R. P.

Polish Journal of Chemistry

2007

Vol. 81, nr 10

1785-1805

New TiO2 based materials doped with W(VI) compounds have been synthesized.We recorded diffusion reflection and absorption spectra and determined phase composition of thematerials. It has been found that thematerials containing 0.01–5.0mass%of the dope exist in the crystalline form of anatase while 10 mass%of the dope leads to the rutile crystalline form.We determined parameters of both types of lattice and proposed explanation for difference in parameters of doped and not doped lattices. Dependence of photocatalytic activity (PA), catalytic activity (CA), electroconductivity sigma, and magnetic susceptibility chi of a sample on the dope content are similar and all of them have maximum at 0.01 mass % of the dope. It has been found that PA and CA linearly depend on sigma and chi . Character of such dependencies has also been explained. Our experimental results proved that the higher is PA of a sample, the higher CA it reveals. This correlation can be observed along the range of existence of anatase crystalline modification as long as formation of rutile lattice changes the basic factors governing PA and CA.