Publication

Sensitization of redox photocatalyst

Michael Graetzel
1985
Patents

Abstract

The sensitization of a semiconductor-based oxidoreduction photocatalyst is carried out by fixing at its surface a colour carrier comprised of a fragment of a transition metal complex such as ruthenium, chromium or iron and of a ligand of the bipyridyl or phenanthrolyl type. The fixing of such a colour carrier results in the displacement of the light absorption band of the photocatalyst towards the visible light. Utilisation of such a catalyst for the photooxidation of aqueous liquids or organic aqueous liquids or for the photodecomposition of aqueous liquids in visible light.

Official source

https://infoscience.epfl.ch/entities/publication/488dfc9e-8f56-44a6-b330-70b23a3a9285

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Michael Graetzel
1985
Patents

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/488dfc9e-8f56-44a6-b330-70b23a3a9285

About this result

Related concepts (13)

Liquid–liquid extraction

Liquid–liquid extraction (LLE), also known as solvent extraction and partitioning, is a method to separate compounds or metal complexes, based on their relative solubilities in two different immiscible liquids, usually water (polar) and an organic solvent (non-polar). There is a net transfer of one or more species from one liquid into another liquid phase, generally from aqueous to organic. The transfer is driven by chemical potential, i.e.

Absorption spectroscopy

Absorption spectroscopy refers to spectroscopic techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field. The intensity of the absorption varies as a function of frequency, and this variation is the absorption spectrum. Absorption spectroscopy is performed across the electromagnetic spectrum.

Electromagnetic absorption by water

The absorption of electromagnetic radiation by water depends on the state of the water. The absorption in the gas phase occurs in three regions of the spectrum. Rotational transitions are responsible for absorption in the microwave and far-infrared, vibrational transitions in the mid-infrared and near-infrared. Vibrational bands have rotational fine structure. Electronic transitions occur in the vacuum ultraviolet regions. Liquid water has no rotational spectrum but does absorb in the microwave region.

Related publications (3)

Sensitization of redox photocatalyst

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